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Middle Power Class-D S peaker Amplifiers
Class-D Speaker Amplifier
for Digital Input
BD5451EFV
●Description
BD5451EFV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and low-power
consumption, delivers an output power of 15W+15W. This IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD)
process technology that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up
to an ultimate level. With this technology, the IC can achieve high efficiency of 90% (15W+15W output with 8Ω load). In
addition, the IC is packaged in a compact reverse heat radiation type power package to achieve low power consumption
and low heat generation and eliminates necessity of external heat-sink up toｓ a total output power of 30W. This product
satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound s ystem.
●Features
1) This IC has one system of digital audio interface.
(I2S format, SDATA: 16 / 20 / 24bit, LRCLK: 32kHz / 44.1kHz / 48kHz, BCLK: 64fs(fixed), MCLK: 256fs(fixed))
2) Low supply current at RESET mode.
3) The decrease in sound qu ality because of the change of th e power supply voltage is prevented with the feedback
circuitry of the output. In addition, a low noise and low distortion are ac hieved.
Eliminate large electrolytic-capacitors for high performance of Power Supply Rejection.
4) S/N of the system can be optimized by adjusting the gain setting among 2 steps. (20dB / 26dB)
5) Available for Monaural mode.
6) Within the wide range of the power supply voltage, it is possible to operate in a single power supp ly. (10～18V)
7) It contributes to miniaturizing, making to the thin type, and the power saving of the system by high efficiency and
low heat.
8) Eliminates pop noise generated when the power supply goes on/off, or when the power supply is suddenly shut off.
High quality muting performance is realize d by using the soft-muting technology.
9) This IC is a highly rel ia ble design to which it has various protection functions.
(High temperature protection, under voltage protection, Output short protection, Output DC voltage prote c tion
and Clock stop protection, (MCLK, BCLK, LRCLK))
10) Small package (HTSSOP-B28 package) contributes to reduction of PCB area.
●Applications
Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc.
No.11075EAT17
Technical Note
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BD5451EFV
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●Absolute maximum ratings (Ta=25℃)
Parameter Symbol Ratings Unit Parameter
Supply voltage VCC 22 V Pin 14, 15, 16, 27, 28 ※1 ※2
Power dissipation Pd 3.3 W ※3
4.7 W ※4
Input voltage VIN -0.3 ～ 4.5 V Pin 1 ～ 6, 13 ※1
Terminal voltage 1 VPIN1 -0.3 ～ 7.0 V Pin 8, 11, 12 ※1
Terminal voltage 2 VPIN2 -0.3 ～ 4.5 V Pin 9 ※1
Terminal voltage 3 VPIN3 22 V Pin 17, 18, 20 ～ 23, 25, 26 ※1
Open-drain terminal voltage VERR -0.3 ～ 22 V Pin 10 ※1
Operating temperature range Topr -25 ～ +85 ℃
Storage temperature range Tstg -55 ～ +150 ℃
Maximum junction temperature Tjmax +150 ℃
※1 The voltage that can be applied reference to GND (Pin 7, 19, 24).
※2 Do not, however exceed Pd and Tjmax=150℃.
※3 70mm×70mm×1.6mm, FR4, 2-layer glass epoxy board (Copper on bottom layer : 70mm×70mm)
Derating in done at 26.4mW/℃ for operating above Ta=25℃. There are thermal via on the board.
※4 70mm×70mm×1.6mm, FR4, 4-layer glass epoxy board (Copper on bottom layer : 70mm×70mm)
Derating in done at 37.6mW/℃ for operating above Ta=25℃. There are thermal via on the board.
●Operating conditions (Ta=25℃)
Parameter Symbol Ratings Unit Parameter
Supply voltage VCC 10 ～ 18 V Pin 14, 15, 16, 27, 28 ※1 ※2
Minimum load impedance RL 3.6 Ω VCC ≦ 18V ※5
3.2 VCC ≦ 16V ※5
※5 Do not, however exceed Pd.
※ No radiation-proof design.
Technical Note
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BD5451EFV
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●Electrical cha r acteristics
(Unless otherwise specified Ta= 25℃, Vcc=12V, f=1kHz, RL=8Ω, RSTX=3.3V, MUTEX=3.3V, Gain=20dB, fs=48kHz
Output LC filter: L=10µH, C=0.1µF)
Parameter Symbol
Limits Unit Conditions
Min. Typ. Max.
Total circuit
Circuit current
(Reset mode) ICC1 - 0.1 0.2 mA
Pin 14, 15, 16, 27, 28, No load
RSTX=0V, MUTEX=0V
Circuit current
(Mute mode) ICC２ - 15 25 mA
Pin 14, 15, 16, 27, 28, No load
RSTX=3.3V, MUTEX=0V
Circuit current
(Sampling mode) ICC3 - 50 80 mA
Pin 14, 15, 16, 27, 28, No load
RSTX=3.3V, MUTEX=3.3V
Open-drain terminal
Low level voltage VERR - - 0.8 V
Pin 10, IO=0.5mA
Regulator output voltage 1 VREG_G 4.7 5.0 5.3 V Pin 11
Regulator output voltage 2 VREG_3 3.0 3.3 3.6 V Pin 9
High level input voltage VIH 2.0 - 3.3 V Pin 1 ～ 6, 13
Low level input voltage VIL 0 - 0.9 V Pin 1 ～ 6, 13
Input current
(Input pull-down terminal) IIH 50 66 95 μA Pin 1 ～ 6, 13, VIN = 3.3V
Speaker Output
Maximum output power 1 PO1 - 10 - W
THD+n=10%
GAIN=20dB ※6
Maximum output power 2 PO２ - 15 - W
VCC=15V, THD+n=10%
GAIN =26dB ※6
Voltage gain GV20 19 20 21 dB PO=1W, Gain=20dB ※6
GV26 25 26 27 dB PO=1W, Gain=26dB ※6
Total harmonic distortion THD - 0.07 - % PO=1W, BW=20～20kHz ※6
Crosstalk CT 66 80 - dB PO=1W, BW=IHF-A ※6
PSRR PSRR - 70 - dB Vropple=1Vrms, f= 1kHz ※6
Output noise voltage
(Sampling mode) VNO - 100 200
μ
Vrms -∞dBFS, BW=IHF-A ※6
PWM sampling frequency
fPWM1 - 256 - kHz fs=32kHz ※6
fPWM2 - 352.8 - kHz fs=44.1kHz ※6
fPWM3 - 384 - kHz fs=48kHz ※6
※6 These items show the typical performance of device and depend on board layout, parts, and power supply.
The standard value is in mounting device and parts on surface of ROHM’s board directly.
Technical Note
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BD5451EFV
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●Electrical cha r acteristic curves (VCC=12V, Ta=25℃, RL=8Ω, Gain=26dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4 la yer board.
Fig.1
Current consumption - Power supply voltage
Fig.2
Current consumption - Power supply voltage
Fig.3
Efficiency - Output power Fig.4
Current consumption - Output power
Fig.5
Wave form when releasing soft-mute
Fig.6
Wave form when activating soft-mute
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
8 101214161820
VCC [V]
ICC [mA]
RSTX=MUTEX=L
RL=8Ω
No signal
0
10
20
30
40
50
60
70
80
8 101214161820
VCC [V]
ICC [mA]
RSTX=H
RL=8Ω
No signal MUTEX=H
MUTEX=L
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 101214161820
OUTPUT POWER [W/CH]
EFFICIENCY [%]
RL=8Ω
R
L
=
6
Ω
RL=4Ω
VCC=12V
Gain=20dB
fin=1KHz
0
0.5
1
1.5
2
2.5
3
3.5
02468101214161820
OUTPUT POWER [W/CH]
ICC [A]
VCC=12V
Gain=20dB
fin=1KHz
RL=8Ω
RL=
6
Ω
RL=4Ω
VCC=12V
RL=8Ω
Po=1W
fin=500Hz
MUTEX(2pin)
5V/div
2V/div
Speaker output
5ms/div
2V/div
5V/div
VCC=12V
RL=8Ω
Po=1W
fin=500Hz
Speaker output
MUTEX(2pin)
5ms/div
Technical Note
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BD5451EFV
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●Electrical cha r acteristics (VCC=12V, Gain=26dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4 la yer board.
Fig.7
Output power – Power supply voltage
Fig.8
Current consumption - Output power
Fig.9
Output power – Power supply voltage
Fig.10
Current consumption - Output power
Fig.11
Output power – Power supply voltage
Fig.12
Current consumption - Output power
※Dotted line means internal dissipation is over package power.
0
5
10
15
20
25
30
35
40
8 101214161820
VCC [V]
OUTPUT POWE R [ W/CH]
RL=4Ω THD+N=10%
THD+N=1%
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0 102030405060
TOTAL OUTPUT POWER [W]
ICC [A]
VCC=12V
VCC=15V
VCC=18V
0
5
10
15
20
25
8 101214161820
VCC [V]
OUTPUT POWER [ W/ CH]
RL=8Ω THD+N=10%
THD+N=1
%
0
0.5
1
1.5
2
2.5
3
0 102030405060
TOTAL OUTPUT POWER [W]
ICC [A]
VCC=12V
VCC=15V VCC=18V
RL=8Ω
0
5
10
15
20
25
30
8 101214161820
VCC [V]
OUTPUT POWER [W/CH]
RL=6Ω THD+N=10%
THD+N=1%
0
0.5
1
1.5
2
2.5
3
3.5
4
0 102030405060
TOTAL OUTPUT POWER [W]
ICC [A]
RL=6Ω
VCC=12V
VCC=15V
VCC=18V
Technical Note
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BD5451EFV
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●Electrical c ha racteristic curves(VCC=12V, Ta=25℃, RL=8Ω, Gain=20dB, fin= 1kHz, fs= 48kHz)
Measured by ROHM designed 4layer board.
Fig.13
FFT of output noise voltage
Fig.14
Voltage gain - Frequency
Fig.15
THD+N – Output power
Fig.16
THD+N – Frequency
Fig.17
Crosstalk – Output power
Fig.18
Crosstalk – Frequency
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY [Hz]
NOISE FFT [dBV]
No signal
10
12
14
16
18
20
22
24
26
28
30
10 100 1k 10k 100k
FREQUENCY [Hz]
VOLTAGE GAIN [dB]
Po=1W
0.01
0.1
1
10
100
0.01 0.1 1 10 100
OUTPUT POWER [W/CH]
THD+N [%]
BW=20~20KHZ
6KHZ
1KHZ
100HZ
0.01
0.1
1
10
100
10 100 1k 10k 100k
FREQUENCY [Hz]
THD+N [%]
BW=20~20KHz
Po=1W
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100
OUTPUT POWER [W/CH]
CROSS-TALK[dB]
BW=20~20KHZ
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY [Hz]
CROSS-TALK [dB]
BW=20~20KHz
Po=1W
Technical Note
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BD5451EFV
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●Electrical c ha racteristic curves(VCC=12V, Ta=25℃, RL=6Ω, Gain=20dB, fin= 1kHz, fs= 48kHz)
Measured by ROHM designed 4layer board
Fig.19
FFT of output noise voltage
Fig.20
Voltage gain - Frequency
Fig.21
THD+N – Output power
Fig.22
THD+N – Frequency
Fig.23
Crosstalk – Output power
Fig.24
Crosstalk – Frequency
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY [Hz]
NOISE FFT [dBV]
No signal
10
12
14
16
18
20
22
24
26
28
30
10 100 1k 10k 100k
FREQUENCY [Hz]
VOLTAGE GAIN [dB]
Po=1W
0.01
0.1
1
10
100
0.01 0.1 1 10 100
OUTPUT POWER [W/CH]
THD+N [%]
BW=20~20KHZ
6KHZ
1KHZ
100HZ
0.01
0.1
1
10
100
10 100 1k 10k 100k
FREQUENCY [Hz]
THD+N [%]
BW=20~20KHz
Po=1W
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100
OUTPUT POWER [W/CH]
CROSS-TALK [dB]
BW=20~20KHZ
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY [Hz]
CROSS-TALK [dB]
BW=20~20KHz
Po=1W
Technical Note
8/34
BD5451EFV
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●Electrical cha r acteristic curves(VCC=12V, Ta=25℃, RL=4Ω, Gain=20dB, fin=1kHz, fs=48kHz)
Measured by ROHM designed 4layer board
Fig.25
FFT of output noise voltage
Fig.26
Voltage gain - Frequency
Fig.27
THD+N – Output power
Fig.28
THD+N – Frequency
Fig.29
Crosstalk – Output power
Fig.30
Crosstalk – Frequency
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY [Hz]
NOISE FFT [dBV]
No signal
10
12
14
16
18
20
22
24
26
28
30
10 100 1k 10k 100k
FREQUENCY [Hz]
VOLTAGE GAIN [dB]
Po=1W
0.01
0.1
1
10
100
0.01 0.1 1 10 100
OUTPUT POWER [W/ CH]
THD+N [%]
BW=20~20KHZ
6KHZ
100HZ
1KHZ
0.01
0.1
1
10
100
10 100 1k 10k 100k
FREQUENCY [Hz]
THD+N [%]
BW=20~20KHz
Po=1W
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
0.01 0.1 1 10 100
OUTPUT POWER [W/CH]
CROSS-TALK [dB]
BW=20~20KHZ
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1k 10k 100k
FREQUENCY [Hz]
CROSS-TALK [dB]
BW=20~20KHz
Po=1W
Technical Note
9/34
BD5451EFV
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●Pin conf iguration and Block diagram
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
14
10
11
12
13
25
24
23
28
27
26
FILP
REG3
GNDA
VCCA
Control
I/F
I2S
I/F
Under Voltage Protection
Over Voltage Protecti on
Clock Stop Protecti on
High Temp erature Protection
Driver
FET
1P
Driver
FET
1N
Driver
FET
2P
Driver
FET
2N
PWM
Modulator
GNDP1
VCCP1
×8 Over
Sampling
Digital
Filter
GNDP2
VCCP2
REG_G
Gain
Selector Output Sh ort Protection
Output DC Volta ge Protection
GNDA Feedback
Feedback
Feedback
Feedback
FILA
RSTX
MUTEX
SDATA
LRCLK
BCLK
MCLK
FILP
REG3
GNDA
VCCA
REG_G
FILA
GAIN
ERROR
VCCP1
VCCP1
OUT1P
OUT1P
OUT1N
OUT1N
OUT2N
OUT2N
OUT2P
OUT2P
VCCP2
VCCP2
GNDP2
GNDP1
Technical Note
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BD5451EFV
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●Pin function explanation (Provided pin voltages are typ. Values)
Pin No. Pin name Pin voltage Pin explanation Internal equivalence circuit
1 RSTX 0V
Reset pin for Digital circuit
H: Reset OFF
L: Reset ON
14
1
7
17.3k
32.7k
2 MUTEX
0V
Speaker output mute control pin
H: Mute OFF
L: Mute ON
3
4
5
6
SDATA
LRCLK
BCLK
MCLK
Digital audio signal input pin
12 GAIN Gain setting terminal
L: 20dB
H: 26dB
7 GNDA 0V
GND pin for Analog signal －
8 FILP 1.75V~2.55V
Bias pin for PWM signal
Please connect the capacitor.
9 REG3 3.3V
Internal power supply pin for Digital circuit
Please connect the capacitor.
10 ERROR 3.3V
Error flag pin
Please connect pull-up resiste r .
H: While Normal
L: While Error
11 REG_G 5.2V
Internal power supply pin for Gate driver
Please connect the capacitor.
14
7
50K
2 , 3, 4
5, 6 , 13
14
8
7
14
9
7
500 K
14
10
7
500
14
11
7
500K
Technical Note
11/34
BD5451EFV
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Pin No. Pin name Pin voltage Pin explanation Internal equivalence circuit
12 FILA 2.5V
Bias pin for PWM signal.
Please connect the capacitor.
14 VCCA Vcc
Power supply pin for Analog signal －
15,16 VCCP2 Vcc Power supply pin for ch2 PWM signal
Please connect the capacitor.
17,18 OUT2P Vcc～0V
Output pin of ch2 positive PWM
Please connect to Output LPF.
19 GNDP2 0V GND pin for ch2 PW M signal
20,21 OUT2N Vcc～0V Output pin of ch2 negative PWM
Please connect to Output LPF.
22,23 OUT1N Vcc～0V Output pin of ch1 negative PWM
Please connect to Output LPF.
24 GNDP1 0V GND pin for ch1 PW M signal
25,26 OUT1P Vcc～0V Output pin of ch1 pos otive PWM
Please connect to Output LPF.
27,28 VCCP1 － Power supply pin for ch1 PWM signal
Please connect the capacitor.
14
12
7
50K
50K
17,18
20,21
19
1516,
27, 28
25, 26
22, 23
24
Technical Note
12/34
BD5451EFV
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●Terminal setting
(1) Gain pin function
GAIN
(13pin) Speaker output gain
L 20dB
H 26dB
(2) RSTX pin, MUTEX pin function
RSTX
(1pin) MUTEX
(2pin)
Normalcy Error detecting
PWM output
(OUT1P, 1N, 2P, 2N) ERROR
Output PWM output
(OUT1P, 1N, 2P, 2N) ERROR
Output
L L or H HiZ_L
(Reset mode) H HiZ_L
(Reset mode) H
H L HiZ_L
(MUTE ON) H HiZ_L
(MUTE ON) L
H H
Normal operation
(MUTE OFF) H HiZ_L
(MUTE ON) L
※RSTX(1pin)terminal, MUTEX(2pin)terminal are internally pulled down by 50 kΩ(Typ.)
※With RSTX=L data of every register within IC (I2S / I/F part, ×8 over sampling digital filter part, latch circuit when detecting ERROR) becomes unnecessary.
●Input digital audi o si gnal sampling frequency (fs) explanatio n
PWM sampling frequency, Soft-start, Soft-mute time, and the detection time of the DC voltage protection in the speaker
depends on sampling frequen cy (fs) of the digital audio input.
Sampling frequency of the
digital audio input
(fs) PWM sampling frequency
(fpwm) Soft-start / Soft-mute time DC voltage protection in
the speaker detection time
32kHz 256kHz 32msec. 64msec.
44.1kHz 352.8kHz 23msec. 46msec.
48kHz 384kHz 21.5msec. 43msec.
●For voltage gain (Gain s ettin g)
BD5451EFV prescribe voltage gain at speak er output (BTL output) under the defin ition 0dBV (1Vrms) as full scale input of
the digital audio input signal. For example, digital audio input signal = -20dBFS (0.1Vrms), Gain setting = 20dB, Load
resistance RL = 8Ω will give speaker output (BTL output) amplitude as Vo=1Vrms. (Output power Po = Vo2/R = 0.125W )
Technical Note
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BD5451EFV
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●Format of digital audio input
・MCLK: It is System Clock input signal.
It will input LRCLK, BCLK, SDATA that synchronizes with this clock that are 256 times of sampling frequency (256fs).
・LRCLK: It is L/R clock input signal.
It corresponds to 32kHz / 44.1kHz / 48kHz with those clock (fs) that are same to the sampling frequenc y (fs) .
The data of a left channel and a right channel for one sample is input to this sectio n.
・BCLK: It is Bit Clock input signal.
It is used for the latch of data in every one bit by sampling frequency’s 64 times sampling frequ ency (64fs).
・SDATA: It is Data input signal.
It is amplitude data. The data length is differe nt according to the resolution of the input digital audio data.
It corresponds to 16/ 20/ 24 bit.
●I2S data format
Fig.31 I2S Data Format 64fs, 24 bit Data
Fig.32 I2S Data Format 64fs, 20 bit Data
Fig.33 I2S Data Format 64fs, 16 bit Data
The Low section of LRCLK becomes Lch, the High section o f LRCLK becomes Rch.
After changing LRCLK, second bit becomes MSB.
LRCLK
BCLK
SDATA
Lch Rch
32 clocks 32 clocks
MSB 22 21 2019 18 17 16 15 14 MSB 22 21 20 19 18 17 16 15 1413 12 11 10 9 8 1312 11 10 9 8
7676
354 1
2LSB 354 12LSB
1/64fs
MSB 18 17 9 8 7 6 5 MSB18 1716 15 14 13 12 11 10 4 3 2 1 LSB 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB
LRCLK
BCLK
SDATA
Lch Rch
MSB MSB
LRCLK
BCLK
SDATA
Lch Rch
9876514 13 12 11 10 4 3 2 1 LSB LSB
14 13 12 11 10 9 8 7 6 5 4 3 2 1
Technical Note
14/34
BD5451EFV
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A
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MCLK
1/f
LRCLK
1/ f LRCLK
BCLK
1/f BCLK
LRCLK
BCLK
SDATA
tHD;LR tSU;LR
tHD;SD
/MCLK
;
tSU;SD
;
MCLK
BCLK
tHD;BC
;tSU;BC
;
●Audio Interface format and timi ng
Recommended timing and operating conditions (MCLK, BCLK, LRCLK, SDATA)
Fig.34 Clock timing
Fig.35 Audio Interface timing (1)
Fig.36 Audio Interface timing (2)
Parameter Symbol
Limit Unit
Min. Max.
1 MCLK frequency fMCLK 8.192 12.288 MHz
2 LRCLK frequency fLRCLK 32 48 kHz
3 BCLK frequency fBCLK 2.048 3.072 MHz
4 Setup time, LRCLK※1 tSU;LR 20 － ns
5 Hold time, LRCLK※1 tHD;LR 20 － ns
6 Setup time, SDATA tSU;SD 20 － ns
7 Hold time, SDATA tHD;SD 20 － ns
8 Setup time, BCLK※2 tSU;BC 3 － ns
9 Hold time, BCLK※2 tHD;BC 7 － ns
※1 This regulation is to keep rising edge of LRCK and rising edge of BCLK from overlapping.
※2 This regulation is to keep rising edge of MCLK and rising edge of BCLK from overlapping.
Technical Note
15/34
BD5451EFV
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A
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●Power supply start-u p se quence
VCCP1 (15, 16pin)
VCCP2 (27, 28pin)
VCCA (14pin)
FILA (11pin)
REG_G (12pin)
BCLK (5pin)
LRCLK (4pin)
SDATA (3pin)
REG_G
REG_3
t
t
t
t
t
MUTEX (2pin)
RSTX (1pin)
t
MCLK (6pin)
FILP
about20msec
REG3 (9pin)
Soft-start
21.5msec(fs=48kHz)
Speaker output
①Power up VCCA, VCCP1, VCCP2 simultaneously.
③Degital audio data communication.
②Set RSTX to High after
power up.
FILA
FILP (8pin)
With VCC＞10V, waiting time unnecessary.
With VCC＞10V, there are no problem
sending digital audio data at RSTX=L..
④After RSTX=L→H wait more than 20msec to MUTEX=L→H.
Technical Note
16/34
BD5451EFV
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A
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●Power supply shut-down sequence
Speaker output
①Set MUTEX to Low.
②After stopping speaker output,
turn off the transmission of digital audio signal.
③Set RSTX to Low
④Power down VCCA, VCCP1,
VCCP2, simultaneously.
Soft-mute
21.5msec(fs=48kHz)
VCCP1 (15, 16pin)
VCCP2 (27, 28pin)
VCCA (14pin)
RSTX (1pin)
MUTEX (2pin)
BCLK (5pin)
LRCLK (4pin)
SDATA (3pin)
REG_G
REG_3
t
t
t
t
t
t
MCLK (6pin)
FILP
FILA
FILP (12pin)
REG_G (11pin)
REG3 (9pin)
FILA (8pin)
about 50msec
With VCC＞10V, there are no problem
sending digital audio data even by
RSTX=L.
Technical Note
17/34
BD5451EFV
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A
© 2011 ROHM Co., Ltd. All rights reserved.
●About the protecti on function
Protection function Detecting & Releasing condition PWM
Output ERROR
Output
Output short protection Detecting
condition Detecting current = 10A (TYP.) HiZ_Low
(Latch) L
(Latch)
DC voltage protection in
the speaker Detecting
condition PWM output Duty=0% or 100%
43msec(fs=48kHz) above fixed HiZ_Low
(Latch) L
(Latch)
High temperature
protection
Detecting
condition Chip temperature to be above 150℃ (TYP.) HiZ_Low
H
Releasing
condition Chip temperature to be belo w 120℃ (TYP.) Normal
operation
Under voltage protection
Detecting
condition Power supply voltage to be below 8V (TYP.) HiZ_Low
H
Releasing
condition Power supply voltage to be above 9V (TYP.) Normal
operation
Over voltage Protection
Detecting
condition Power supply voltage to be above 21.5V(TYP.) HiZ_Low
H
Releasing
condition Power supply voltage to be below 20.5V(TYP.) Normal
operation
Clock stop protection
Detecting
condition No change to MCLK more than 1µsec (TYP.) or
no change to BCLK more than 1µsec (TYP.) or
no change to LRCLK more than 21µsec (at fs=48kHz.). HiZ_Low
H
Releasing
condition Normal input to MCLK, BCLK and LRCLK. Normal
operation
* The ERROR pin is Nch open-drain output.
* Once an IC is latched, the circuit is not released automatically even after an abnormal status is removed.
The following procedures ① or ② is available for recovery.
①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again.
②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates.
Technical Note
18/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
1) Output short protection(Short to the power supply)
This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuite d to
the power supply due to abnormalit y.
Detecting condition - It will detect when MUTEX pin is set High and the current that flows in the PWM output pin
becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if
detected, and IC does the latch.
Releasing method - ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High
again.
②Restore power supply after dropping to power supply voltage Vcc ＜3V(10msec (Min.) h olding)
which internal power on reset circuit activate s.
ERROR (10pin )
t
t
OUT1P (25,26 pin)
OUT1N (22,23 pin)
OUT2N (20,21 pin)
OUT2P (17,18 pin)
10
A
(TYP .)
t
MUTEX(2pin)
1µsec(TYP.)
t
Short to VCC Release from short to VCC
PWM out ：IC latches with HiZ-Low. Released from latch state .
Over current
Latch release
10msec(Min.)
Technical Note
19/34
BD5451EFV
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A
© 2011 ROHM Co., Ltd. All rights reserved.
2) Output short protection(Short to GND)
This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuite d to
GND due to abnormality.
Detecting condition - It will detect when MUTEX pin is set Hig h and the current that flows in the PWM output terminal
becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if
detected, and IC does the latch.
Releasing method – ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High
again.
②Restore power supply after dropping to power supply voltage Vcc ＜3V(10msec (Min.) h olding)
which internal power on reset circuit activate s.
Short to GND Release from short to
GND
PWM out ： IC latches with HiZ-Low. Released from latch state.
Over current
Latch release
ERROR (10pin)
MUTEX(2pin)
１μsec(TYP.)
t
t
t
10A(TYP.)
t
OUT1P (25,26pin)
OUT1N (22,23pin)
OUT2N (20,21pin)
OUT2P (17,18pin)
１0msec(Min.)
Technical Note
20/34
BD5451EFV
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A
© 2011 ROHM Co., Ltd. All rights reserved.
3) DC voltage protection in the speaker
When the DC voltage in the s peaker is im pressed due t o abnorma lity, th is IC has the protection circ uit where the sp eaker
is defended from destruction.
Detecting condition - It will detect when MUTEX pin is set High or Low and PWM output Duty=0% or 100% ,
43msec(fs=48kHz) or above. Once detected, The PWM output instantaneously enters the state
of HiZ-Low, and IC does the latch.
Releasing method – ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High
again.
②Restore power supply after dropping to power supply voltage Vcc ＜3V(10msec (Min.) h olding)
which internal power on reset circuit activate s.
OUT1P (25, 26pin)
ERROR (10pin)
OUT1N (22, 23pin)
OUT2N (20, 21pin)
OUT2P (17, 18pin)
t
t
t
t
MUTEX(2pin)
Speaker output
Latch release state.
Soft-start
Latch release
PWM out locked duty=100% abnormal state. Abnormal state release.
PWM output ： IC latche with HiZ-Low.
21.5msec(fs=48kHz)
１0msec(Min.)
Technical Note
21/34
BD5451EFV
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A
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4) High temperature protection
This IC has the high temperat ure protection circuit that prevents thermal r eckless driving under an a bnormal state for the
temperature of the chip to exceed Tjmax=150℃.
Detecting condition - It will detect when MUTEX pin is set High and the tempera ture of the chip becomes 15 0℃(TYP.)
or more. Speaker output turn MUTE immediate ly, when High tempe rature prot ection is de tected.
Releasing condition - It will release when MUTEX pin is set High and the temperature of the chip becomes 120℃
(TYP.) or less. The speaker output is outputted through a soft-start when released.
Temperature of
IC chip junction(℃)
Speaker output
HiZ-Low
Soft-start
21.5msec(fs=48KHz)
OUT1P (25,26pin)
150℃
120℃
3.3V
ERROR (10pin)
OUT1N (22,23pin)
OUT2N (20,21pin)
OUT2P (17,18pin)
t
t
t
t
Technical Note
22/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
5) Under voltage protection
This IC has the under voltage protection circuit that make speaker o utput mute once detecting e xtreme drop of the p o wer
supply voltage.
Detecting condition – It will detect when MUTEX pin is set High and the power supply voltage becomes lower than
8V.Speaker output turn MUTE immediately, when Under voltage protection is detected.
Releasing condition – It will release when MUTEX pin is set High and the power supply voltage becomes more than
9V. The speaker output is outputted through a soft-start when released.
Speaker output
HiZ-Low
VCCA (14pin)
ERROR (10pin)
9V
8V
3.3V
VCCP1 (15, 16pin)
VCCP2 (27, 28pin)
t
t
t
t
OUT1P (25,26pin)
OUT1N (22,23pin)
OUT2N (20,21pin)
OUT2P (17,18pin)
Soft-start
21.5msec(fs=48KHz)
Technical Note
23/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
6) Over voltage protection
This IC has the under voltage protection circuit that make speaker output m ute once detecting e xtreme drop of the p ower
supply voltage.
Detecting condition – It will detect when MUTEX pin is set High and the power supply voltage becomes more than
21.5V.Speaker output turn MUTE immediately, when over voltage protection is detected.
Releasing condition – It will release when MUTEX pin is set High and the power supply voltage becomes lower than
20.5V. The speaker output is outputted through a soft-start when released.
VCCA (14pin)
ERROR (10pin)
19V
21V
3.3V
VCCP1 (15, 16pin)
VCCP2 (27, 28pin)
t
t
t
t
OUT1P (25,26pin)
OUT1N (22,23pin)
OUT2N (20,21pin)
OUT2P (17,18pin)
Speaker output
HiZ-Low
Soft-start
21.5msec(fs=48KHz)
Technical Note
24/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
7-1) Clock stop protection(MCLK)
This IC has the clock stop protection circui t that make the speaker output mute when the MCLK signal of the digital aud io
input stops.
Detecting condition - It will detect when MUTEX pin is set High and the MCLK signal stops for about 1µsec or more.
21.5V. Speaker output turn MUTE immediately, clock stop protection is detected.
Releasing condition - It will release when MUTEX pin is set High and the MCLK signal returns to the normal clock
operation. The speaker output is outputted through a soft-start when released.
OUT1P (25,26pin)
OUT1N (22,23pin)
OUT2N (20,21pin)
OUT2P (17,18pin)
MCLK (6pin)
ERROR (10pin)
3.3V
t
t
t
t
Speaker output
Clock stop Clock recove
r
HiZ- Low
Protection start with
about 1µ clock stop.
Soft - start
21.5msec (fs= 48 kHz)
Technical Note
25/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
7-2) Clock stop protection(BCLK)
This IC has the clock stop protection circuit th at make the speaker output mute when the BCLK signal of the digital audio
input stops.
Detecting condition - It will detect when MUTEX pin is set High and the BCLK signal stops for about 1µsec or more.
21.5V.Speaker output turn MUTE immediately, when clock stop protection is detected.
Releasing condition - It will release when MUTEX pin is set High and the BCLK signal returns to the normal clock
operation. The speaker output is outputted through a soft-start when released.
BCLK (5pin)
ERROR(10pin)
3.3V
t
t
t
t
OUT1P (25,26pin)
OUT1N (22,23pin)
OUT2N (20,21pin)
OUT2P (17,18pin)
Clock stop Clock recover
HiZ- Low
Protection start with
about 1μ sec clock stop .
Soft - start
21.5msec ( fs= 48kHz)
Speaker output
Technical Note
26/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
7-3) Clock stop protection (LRCLK)
This IC has the clock stop protection circuit that make the speaker output mute when the LRCLK signal of the digital
audio input stops.
Detecting condition - It will detect when MUTEX pin is set High and the LRCLK signal stops for about 21µsec (at
fs=48kHz) or more. Speaker output turn MUTE immediately, when clock stop protection is
detected.
Releasing condition - It will release when MUTEX pin is set High and the LRCLK signal returns to the normal clock
operation. The speaker output is outputted through a soft-start when released.
LRCLK (4pin)
ERROR (10pin)
Protection start
with about 21us
(fs=48kHz) clock
stop.
3.3V
t
t
t
t
OUT1P (25,26pin)
OUT1N (22,23pin)
OUT2N (20,21pin)
OUT2P (17,18pin)
Clock stop Clock recover
HiZ-Low
Soft-start
21.5msec(fs=48kHz)
Speaker output
Technical Note
27/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Application Circuit Example (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
●BOM list (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
Parts Parts No. Value Company Product No. Rated
Voltage Tolerance Size
IC U1 － ROHM BD5451EFV － － 9.7mm×6.4mm
Inductor L17, L20, L23, L26 10μH TOKO B1047DS-100M=3P - (±20%) 7.6mm×7.6mm
Resistor R10 100kΩ ROHM MCR03EZPJ104 1/10W J(±1%) 1.6mm×0.8mm
Capacitor
C14, C15, C27 10µF
MURATA
GRM31CB11E106KA75L 25V B(±10%) 3.2mm×1.6mm
C8, C9, C11, C12 0.1µF GRM188B11A104KA92D 10V B(±10%) 1.6mm×0.8mm
C17, C20, C23, C26 0.1µF GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm
As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between
power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with eac h
property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If
the connected power suppl y does not have sufficient current absorpti on capacity, reg enerative current will cause the
voltage on the power supply li ne to rise, which combined with the pr oduct and its peripheral circuitry may exc eed the
absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a
voltage clamp diode between the power supply and GND pins.
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
14
10
11
12
13
25
24
23
28
27
26
RSTX
MUTEX
ERROR
Digital
Audio
Source
μ-con
GNDA
C8
C9
0.1μF
0.1μF
VCCP1: 10V～16V
FILP
REG3
GNDA
VCCA
Control
I/F
I2S
I/F
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
Driver
FET
1P
Driver
FET
1N
Driver
FET
2P
Driver
FET
2N
PWM
Modulator
GNDP1
VCCP1
×8 Over
Sampling
Digital
Filter
VCCA: 10V～16V
SP 1ch
C26
L26
C23
L23
10μH
10μH
0.1μF
0.1μF(8Ω)
C27
10μF
GNDP1 GNDP1
VCCP2: 10V～16V
SP 2ch
C17
L17
C20
L20
10μH
10μH
0.1μF
0.1μF
(8Ω)
C15
10μF
GNDP2
GNDP2
GNDP2
VCCP2
REG_G
0.1μF
Gain
Selector
100kΩ
R10
Output Short Protection
Output DC Voltage Protection
GNDA Feedback
Feedback
Feedback
Feedback
C11
FILA
0.1μF
C12
C14
10μF
SDATA
LRCLK
BCLK
MCLK
0
0
0
0(NOP)
Technical Note
28/34
BD5451EFV
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A
© 2011 ROHM Co., Ltd. All rights reserved.
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
14
10
11
12
13
25
24
23
28
27
26
RSTX
MUTEX
ERROR
μ-con
GNDA
C8
C9
0.1μF
0.1μF
VCCP1: 10V～16V
FILP
REG3
GNDA
VCCA
Control
I/F
I2S
I/F
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
Driver
FET
1P
Driver
FET
1N
Driver
FET
2P
Driver
FET
2N
PWM
Modulator
GNDP1
VCCP1
×8 Over
Sampling
Digital
Filter
VCCA: 10V～16V
SP 1ch
C26
L26
C23
L23
10μH
10μH
0.1μF
0.1μF(8Ω)
C27
10μF
GNDP1 GNDP1
GNDP1
GNDP2
VCCP2
REG_G
0.1μF
Gain
Selector
100kΩ
R10
Output Short Protection
Output DC Voltage Protection
GNDA Feedback
Feedback
Feedback
Feedback
C11
FILA
0.1μF
C12
C14
10μF
Digital
Audio
Source
SDATA
LRCLK
BCLK
MCLK
0
0
0
0(NOP)
●Application Circuit Example (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
●BOM list (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W)
Parts Parts No. Value Company Product No. Rated
Voltage Tolerance Size
IC U1 － ROHM BD5451EFV － － 9.7mm×6.4mm
Inductor L23, L26 10μH TOKO B1047DS-100M=3P - (±20%) 7.6mm×7.6mm
Resistor R10 100kΩ ROHM MCR03EZPJ104 1/10W F(±1%) 1.6mm×0.8mm
Capacitor
C14, C27 10µF
MURATA
GRM31CB11E106KA75L 25V B(±10%) 3.2mm×1.6mm
C8, C9, C11, C12 0.1µF GRM188B11A104KA92D 10V B(±10%) 1.6mm×0.8mm
C23, C26 0.1µF GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm
As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between
power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with eac h
property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If
the connected power suppl y does not have sufficient current absorpti on capacity, reg enerative current will cause the
voltage on the power supply li ne to rise, which combined with the pr oduct and its peripheral circuitry may exc eed the
absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a
voltage clamp diode between the power supply and GND pins.
Technical Note
29/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Application Circuit Example (Stereo BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W)
※To prevent going over absolute maximum rating by the leap out of power supply and the linking of PWM output wave
form, please provide countermeasure shown below diagram (dot-line ※) when using at Vcc＞16V.
●BOM list (Stereo BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W)
Parts Parts No. Value Company Product No. Rated
Voltage Tolerance Size
IC U1 － ROHM BD5451EFV － － 9.7mm×6.4mm
Inductor L17, L20, L23, L26 10μH TOKO B1047DS-100M=3P - (±20%) 7.6mm×7.6mm
Resistor R10 100kΩ ROHM MCR03EZPJ104 1/10W J(±5%) 1.6mm×0.8mm
R17, R20, R23, R26 6.8Ω ROHM MCR03EZPFL6R80 1/10W F(±1%) 1.6mm×0.8mm
Capacitor
C14, C15, C27 10µF
MURATA
GRM31CB11E106KA75L 25V B(±10%) 3.2mm×1.6mm
C8, C9, C11, C12 0.1µF GRM188B11A10 4KA92D 10V B(±10%) 1.6mm×0.8mm
C17, C20, C23, C26 0.1µF GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm
C 1 7 , B C 2 0 B , C 2 3 B , C 2 6 B 680pF GRM188B1 1E681KA01 25V B(±10%) 1.6mm×0.8mm
Electrolytic
Capacitor C14B 220μF Panasonic ECA1EMH221 25V ±20% φ8mm×11.5mm
As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between
power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each
property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If
the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the
voltage on the power supply li ne to rise, which combined with the product a nd its peripheral circuitry may exceed the
absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a
voltage clamp diode between the power supply and GND pins.
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
14
10
11
12
13
25
24
23
28
27
26
RSTX
MUTEX
ERROR
Digital
Audio
Source
μ-con
GNDA
C8
C9
0.1μF
0.1μF
FILP
REG3
GNDA
VCCA
Control
I/F
I2S
I/F
Under Voltage Protection
Over Voltage Protection
Clock Stop Protection
High Temperature Protection
Driver
FET
1P
Driver
FET
1N
Driver
FET
2P
Driver
FET
2N
PWM
Modulator
GNDP1
VCCP1
×8 Over
Sampling
Digital
Filter
VCC: 16V～18V
SP 1ch
C26
L26
C23
L23
10μH
10μH
0.1μF
0.1μF(8Ω)
C27
10μF
GNDP1 GNDP1
SP 2ch
C17
L17
C20
L20
10μH
10μH
0.1μF
0.1μF
(8Ω)
C15
10μF
GNDP2
GNDP2
GNDP2
VCCP2
REG_G
Gain
Selector
100kΩ
R10
Output Short Protection
Output DC Voltage Protection
GNDA Feedback
Feedback
Feedback
Feedback
FILA
C11
0.1μF
C26B
680pF
C23B
680pF
R23
6.8Ω
R26
6.8Ω
GNDP1
C20B
680pF
C17B
680pF
R17
6.8Ω
R20
6.8Ω
GNDP2
C14B
220μF
C12
0.1μF
GND
C14
10μF
SDATA
LRCLK
BCLK
MCLK
0
0
0
0(NOP)
※
※
※
Technical Note
30/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
14
10
11
12
13
25
24
23
28
27
26
RSTX
MUTEX
ERROR
Digital
Audio
Source
μ-con
GNDA
C8
C9
0.1μF
0.1μF
FILP
REG3
GNDA
VCCA
Control
I/F
I2S
I/F
Under Voltage Protection
Over Voltage Pro tection
Clock Stop Protection
High Temperature Protection
Driver
FET
1P
Driver
FET
1N
Driver
FET
2P
Driver
FET
2N
PWM
Modulator
GNDP1
VCCP1
×8 Over
Sampling
Digital
Filter
VCC: 16V～18V
SP 1ch
C26
L26
C23
L23
10μH
10μH
0.1μF
0.1μF(8Ω)
C27
10μF
GNDP1 GNDP1
GNDP1
GNDP2
VCCP2
REG_G
Gain
Selector
100kΩ
R10
Output Short Protection
Output DC Voltage Protection
GNDA Feedback
Feedback
Feedback
Feedback
FILA
C11
0.1μF
C26B
680pF
C23B
680pF
R23
6.8Ω
R26
6.8Ω
GNDP1
C14B
220μF
C12
0.1μF
GND
C14
10μF
SDATA
LRCLK
BCLK
MCLK
0
0
0
0(NOP)
※
※
●Application Circuit Example (Monaural BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W)
※To prevent going over absolute maximum rating by the leap out of power supply and the linking of PWM output wave
form, please provide countermeasure shown below diagram (dot-line ※) when using at Vcc＞16V.
●BOM list (Monaural BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W)
Parts Parts No. Value Company Product No. Rated
Voltage Tolerance Size
IC U1 － ROHM BD5451EFV － － 9.7mm×6.4mm
Inductor L23, L26 10μH TOKO B1047DS-100M=P3 - (±20%) 7.6mm×7.6mm
Resistor R10 100kΩ ROHM MCR03EZPJ104 1/10W J(±5%) 1.6mm×0.8mm
R23, R26 6.8Ω MCR03EZPFL6R80 1/10W F(±1%) 1.6mm×0.8mm
Capacitor
C14, C27 10µF
MURATA
GRM31CB31E106KA75L 25V B(±10%) 3.2mm×1.6mm
C8, C9, C11, C12 0.1µF GRM188B11A104KA92D 10V B(±10%) 1.6mm×0.8mm
C23, C26 0.1µF GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm
C23B, C26B 680pF GRM188B11E681KA01 25V B(±10%) 1.6mm×0.8mm
Electrolytic
Capacitor C14B 220μF Panasonic ECA1EMH221 25V ±20% φ8mm×11.5mm
As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between
power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with eac h
property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value.
If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause
the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed
the absolute maximum rati ngs. It is recommended to implem ent a physical safety measu re such as the insertion of a
voltage clamp diode between the power supply and GND pins.
Technical Note
31/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Output LC Filter Circuit
An output filter is required to eliminate radio-frequency components exceeding the audio-frequency region supplied to a
load (speaker). Because this IC uses sampling clock frequencies from 256kHz (fs=32kHz) to 384kHz (fs=48kHz) in the
output PWM signals, the high-frequency components must be appropriately removed.
This section takes an example of an LC t ype LPF shown below, in which coil L and capa citor C compose a differential filter
with an attenuation property of -12dB / oct. A large part of switching currents flow to capacitor C, and only a small part of
the currents flow to speaker
R
L
. This filter reduces unwanted emission this way. In addition, coil L and capacitor Cg
compose a filter against in-phase comp onents, reducing unwanted emission further.
Following presents output LC filter constants with typical load impedances.
RL L C
4Ω 10µH 0.47µF
6Ω 10µH 0.15µF
8Ω 10µH 0.1µF
Use coils with a low direct-current resistance and with a sufficient margin of allowable currents. A high direct-current
resistance causes power losses. In addition, select a closed magnetic circuit type product in normal cases to prevent
unwanted emission.
Use capacitors with a low equivalent series resistance, and good impedance characteristics at high frequency ranges
(100kHz or higher). Also, select an item with sufficient withstand voltage because flowing massive amount of
high-frequency currents is expected.
RL
C
L
C
L
22,23
or
20,21
25,26
or
17,18
Technical Note
32/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Notes for use
1 ) Absolute maximum ratings
Use of the IC in excess of absolute ma ximum ratings such as the applied voltage or operating temperat ure range may
result in IC damage. Assumptions should no t be made regarding the state of the IC (short mode or open mode) when
such damage is suffered. A physical safety measure such as a fuse should be implemented when use of the IC in a
special mode where the absolute maximum ratings may be excee ded is anticipated.
2 ) Power supply lines
As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between
power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each
property such as emptied capacity at lo wer temperature regarding electrolytic capacitor to decide capacity value. If the
connected power supply does not have sufficient current absorption capacity, regenerative current will cause the
voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the
absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a
voltage clamp diode between the power supply and GND pins.
3 ) GND potential(Pin 7, 19, 24).
Any state must become the lowest voltage about GND terminal and VSS terminal.
4 ) Input terminal
The parasitic elements are formed in the IC because of the voltage relation. The parasitic element operating causes th e
wrong operation and destruction. Therefore, please be careful so as not to operate the parasitic elements by
impressing to input terminals lower voltage than GND and VSS. Please do not apply the voltage to the input terminal
when the power-supply voltage is not impressed.
5 ) Setting of heat
Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating
conditions. This IC exposes its frame of the backside of package. Note that this part is assumed to use after providing
heat dissipation treatment to improve heat dissipation efficiency. Try to occupy as wide as possible with heat dissipation
pattern not only on the board surface but also the backside.
Class D speaker amplifier is high efficiency and low heat generation by comparison with conventional Analog power
amplifier. However, In case it is operated continuously by maximum output power, Power dissipation (Pdiss) may
exceed package dissipation. Please consider about heat design that Power dissipation (Pdiss) does not exceed
Package dissipation (Pd) in average power (Poav). (Tjmax : Maximum junction temperature=150℃, Ta : Peripheral
temperature[℃], θja : Thermal resistance of package[℃/W], Poav: Average power[W], η: Efficiency)
Package dissipation: Pd (W) = (Tjmax - Ta)/θja
Power dissipation : Pdiss(W )= Poav ×(1/η- 1)
6 ) Actions in strong magnetic field
Use caution when using the IC in the presence of a strong magnetic field as doing so may cause the IC to malfunction.
7 ) Thermal shutdown circuit
This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates, the
output transistors are placed under open status. T he thermal shutdown circuit is primari ly intended to shut do wn the IC
avoiding thermal runaway under abnormal conditions with a chip temperature exceeding Tjmax = 150℃.
8 ) Shorts between pins and misinstallation
When mounting the IC on a board, pay adequate attention to orientation and plac ement discrepancies of the IC. If it is
misinstalled and the power is turned on, the IC may be damaged. It also ma y be damaged if it is short ed by a foreign
substance coming between pins of the IC or between a pin and a power supply or a pin and a GND.
9 ) Power supply on/off (Pin 14, 15, 16, 27, 28)
In case power supply is started up, RSTX (Pin 1) and MUTEX (Pin 2) always should be set Low. And in case power
supply is shut down, it should be set Low likewise. Then it is possible to eliminate pop noise when power supply is
turned on/off. And also, all power suppl y ter minals should start up and shut down together.
10 ) ERROR terminal(Pin 10)
A error flag is outputted when Output short protection and DC voltage protection in the speaker are operated. These
flags are the function which the condition of t his pro duct is shown in.
11) Precautions for Spealer-setting
If the impedance characteristics of the speakers at high-frequency range while increas e rapidly, the IC might not have
stable-operation in the resonance frequency range of the LC-filter. Therefore, consider adding damping-circuit, etc.,
depending on the impedance of the speaker.
12) Notes about the phase of MCLK (Pin6) and BCLK (Pin5)
If the rising edge of MCLK (Pin6) and BCLK (Pin5) becomes simultaneous, noise or sound shutdown may occur.
Please cope with it, when the rising edge of MCLK and BCLK becomes simultaneous. (Example: Insert RC filter in
BCLK)
Technical Note
33/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Package outline (HTSSOP-B28)
●Allowable P ower Dissipation
Measuring instrument: TH-156(Shibukawa Kuwano Electrical Instruments Co., Ltd.)
Measuring conditions: Installation on ROHM’s board
Board size: 70mm×70mm×1.6mm(with thermal via on board)
Material: FR4
・The board on exposed h ea t sink on the back of package are connected by soldering.
PCB①: 2-layer board(back copper foil size: 70mm×70mm)，θja=37.9℃/W
PCB②: 4-layer board(back copper foil size: 70mm×70mm)，θja=26.6℃/W
0
1
2
3
4
5
6
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
Ambient temperature :Ta (°C)
Power dissipation :Pd (W)
BD5451EFV
Lot No.
(UNIT: mm)
PKG: HTSSOP-B28
Drawing No: EX199-500 2-1
PCB② 4.7W
PCB① 3.3W
HTSSOP-B28 Package
Technical Note
34/34
BD5451EFV
www.rohm.com 2011.06 - Rev.
A
© 2011 ROHM Co., Ltd. All rights reserved.
●Ordering part number
B D 5 4 5 1 E F V - E 2
Part No.
Part No.
Package
EFV: HTSSOP-B28 Packaging and forming specifi cation
E2: Embossed tape and reel
(Unit : mm)
HTSSOP-B28
0.08
M
0.08 S
S
1.0±0.2
0.5±0.15
4
°
+
6
°
−
4
°
0.17+0.05
-
0.03
1528
141
(2.9)
4.4±0.1
(5.5)
(MAX 10.05 include BURR)
0.625
6.4±0.2
9.7±0.1
1PIN MARK
1.0MAX
0.65
0.85±0.05
0.08±0.05
0.24 +0.05
-
0.04
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tape (with dry pack)Tape
Quantity
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand
2500pcs
E2
()
Direction of feed
Reel 1pin
Datasheet
Datasheet
Notice - GE Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
Notice
Precaution on using ROHM Products
1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN USA EU CHINA
CLASSⅢ CLASSⅢ CLASSⅡb CLASSⅢ
CLASSⅣ CLASSⅢ
2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3. Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4. The Products are not subject to radiation-proof design.
5. Please verify and confirm characteristics of the final or mounted products in using the Products.
6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8. Confirm that operation temperature is within the specified range described in the product specification.
9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the
ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Datasheet
Datasheet
Notice - GE Rev.002
© 2014 ROHM Co., Ltd. All rights reserved.
Precautions Regarding Application Examples and External Circuits
1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2. You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative in case of export.
Precaution Regarding Intellectual Property Rights
1. All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the information contained in this document.
Other Precaution
1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4. The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
DatasheetDatasheet
Notice – WE Rev.001
© 2014 ROHM Co., Ltd. All rights reserved.
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
