HA17451AP/AFP
Switching Regulator Controllers for DC/DC Converters
ADE-204-057 (Z)
Rev. 0
Dec. 2000
Description
The HA17451 is a dual-channel switching regulator controller IC. Each channel contains the basic circuits
for controlling a PWM-type switching-regulator power supply. Both channels are integrated onto the same
chip. Both channels can be completely synchronized, using the same oscillator output waveform. Each
channel can provide output voltages for step-up, step-down, inverting, and other converter topologies.
These controllers operate at voltages from 3.3 V to 40 V, making them suitable for a wide range of
applications. They are ideal for chopper-type DC/DC converters. They are similar to the TL1451, but note
that the HA17451A differs from the TL1451A.
Functions
• Low-dropout 2.5V voltage reference
• Undervoltage lockout
• Triangle-wave oscillator
• Adjustable dead-time control
• Error amplifier
• Output driver (open-collector transistor type)
• PWM comparator
HA17451AP/AFP
2
Features
• Low dropout voltage of on-chip 2.5V voltage reference: Vdrop = 0.2 V (typ)
• Operates throughout wide supply voltagerange: 3.3 V to 40 V
• Large maximum output current: 50 mA (max)
• Undervoltage lockout circuit
High threshold voltage: 3.15 V (typ)
Low threshold voltage: 2.98 V (typ)
• Low current drain: 1.5 mA (typ)
• Operates at wide range of oscillator frequencies: fOSC = 1 kHz to 300 kHz
• Dead time adjustable through full duty cycle range
• Surface-mount package (SOP16) for saving space (HA17451AFP)
Ordering Information
Type Name Package
HA17451AP DP-16
HA17451AFP FP-16DA
HA17451AP/AFP
3
Pin Arrangement
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
CT
RT
NON. INV.
INPUT1
INV.
INPUT1
FEED
BACK1
D.T.C1
OUT1
GND
Vref
NON. INV.
INPUT2
INV.
INPUT2
FEED
BACK2
D.T.C2
OUT2
VCC
S.C.P
(Top view)
Pin Functions
Pin No. Symbols Functions
1C
TTiming capacitor
2R
TTiming resistor
3, 14 NON. INV. INPUT Non-inverting input of error amp
4, 13 INV. INPUT Inverting input of error amp
5, 12 FEEDBACK Output of error amp
6, 11 D.T.C Dead time control
7, 10 OUT Output
8 GND Ground
9V
CC Input voltage
15 S.C.P Short circuit protection
16 Vref Reference voltage output
HA17451AP/AFP
4
Block Diagram
VCC
Reference
voltage
generation
circuit
Triangle
oscillator
OUT1
Output1
OUT2
Output2
DEAD
TIME
CONTROL2
DEAD
TIME
CONTROL1
GND
R
Under-
voltage
lockout
Vref /2
Error amp2
Short circuit
protection
comparator
PWM
comparator2
PWM
comparator1
+
–
+
–
+
–
+
Vref
NON. INV. INPUT1
INV. INPUT1
FEEDBACK1
FEEDBACK2
NON. INV. INPUT2
INV. INPUT2
S.C.P
(16)
(3)
(4)
CR
TT
(6)
Vref
(5)
(12)
(14)
(15)
(11) (8)
D.T.C2D.T.C1
(10)
(7)
(2)
(1)
(9)
Error amp1
+
–
–
+
–
–
(13)
HA17451AP/AFP
5
Short-circuit Protection in HA17451A
5
12
15
(2)
14
13
10 (1)
(3)
+
+
–
+
–
–
+
–
High
Low
Error Amp2
Low
1.23 V
Vref
Vref
PWM Comparator2
Feedback line
Load
(voltage drop)
VB
←
Vout
R
U.V.L.O.
Also used as positive feedback route
Positive
feedback
Shutdown
(1)Overcurrent →(2)Vout drops →(3)Output turns off
Absolute Maximum Ratings (Ta = 25°C)
Item Symbol Rating Unit Note
Power supply voltage VCC 40 V
Error amplifier input voltage VI20 V
Collector output voltage VO40 V
Collector output current IO50 mA
Power dissipation PT680 mW *
Operating temperature Topr − 20 to +85 °C
Storage temperature Tstg − 55 to +125 °C
Note: This value applies to the HA17451AP at ambient temperatures up to Ta = 45°C. Derate by8.3
mW/°C above that point.
HA17451AP/AFP
6
Electrical Characteristics (Ta = 25°C, VCC = 6 V, fOSC = 200 kHz)
Reference Section
Item Symbol Min Typ Max Unit Test Conditions
Output voltage Vref 2.40 2.50 2.60 V IO = 1 mA
Voltage drop Vdrop 0.2 0.35 V IO = 1 mA
Line regulation Line 2 12.5 mV VCC = 3.0 to 40 V
Load regulation Load 1 7.5 mV IO = 0.1 to 1 mA
Maximum output current IOMAX 3 10 30 mA Vref = 0.5 V
Reverse voltage state
minimum current IOR 18 µA− 0.2 V < Vref < 0 V
Undervoltage Lockout Protection Section
Item Symbol Min Typ Max Unit Test Conditions
High level threshold Vth 2.90 3.15 3.30 V IO = 0.1 mA
Low level threshold Vtl 2.75 2.98 3.15 V IO = 0.1 mA
Hysteresis width VHYS 100 170 mV IO = 0.1 mA
Reset voltage VR1.5 1.9 VI
O
= 0.1 mA
Protection Section
Item Symbol Min Typ Max Unit Test Conditions
Input threshold VTPC 0.56 0.61 0.66 V
Input standby voltage VSTBY 140 185 230 mV No pull up
Input source current Ibpc 10 15 20 µA
Comparator threshold voltage Vtc 1.23 V Pins 5 and 12
Oscillator Section
Item Symbol Min Typ Max Unit Test Conditions
Frequency fOSC 200 kHz CT = 330 pF, RT = 10 kΩ
Initial accuracy fdev 10 %
Voltage stability fdv 1%
HA17451AP/AFP
7
Electrical Characteristics (Ta = 25°C, VCC = 6 V, fOSC = 200 kHz) (cont)
Dead Time Control Section
Item Symbol Min Typ Max Unit Test Conditions
Input threshold voltage Vt0 2.05 2.25 V fOSC = 10 kHz
Duty cycle = 0%
Input threshold voltage Vt100 1.20 1.45 Vf
OSC = 10 kHz
Duty cycle = 100%
Error Amp Section
Item Symbol Min Typ Max Unit Test Conditions
Input offset voltage VIO − 6 6mVV
O
(pin 5, 12) = 1.25 V
Input offset current IIO −100 100 nA VO (pin 5, 12) = 1.25 V
Input bias current IB160 500 nA VO (pin 5, 12) = 1.25 V
Common mode input voltage
range VICR 1.0 1.45 V VCC = 3.3 to 40 V
Open loop gain AV70 80 dB RNF = 200 kΩ*
Band width GB 2.5 MHz
Common mode rejection ratio CMRR 40 60 dB
Maximum output voltage VOM+ Vref −
0.15 V
V
OM- 1.0
Output sink current IOM+ 0.5 1.6 mA VO = 1.25 V
Output source current IOM- −70 −45 µAV
O
= 1.25 V
Note: RNF is connected between pin 4 and 5 for channel 1, pin 12 and 13 for channel 2.
Output Section
Item Symbol Min Typ Max Unit Test Conditions
Collector off-state
current (1) ILeak (1) 10 µAV
O = 40 V
Collector off-state
current (2) ILeak (2) 10 µAV
O
= 40 V
VCC = Open
Saturation voltage Vsat 1.2 2 V IO = 10 mA
HA17451AP/AFP
8
PWM Comparator Section
Item Symbol Min Typ Max Unit Test Conditions
Input threshold voltage Vt0 2.05 2.25 V fOSC = 10 kHz
Duty cycle = 0%
Input threshold voltage Vt100 1.20 1.45 Vf
OSC = 10 kHz
Duty cycle = 100%
Input sink current Isink 0.5 1.6 mA VO (pin 5, 12) = 1.25 V
Input source current Isource −70 −45 µAV
O
(pin 5, 12) = 1.25 V
Total Current
Item Symbol Min Typ Max Unit Test Conditions
Standby current Iccs 1.5 2.0 mA Output off-state
Average supply current Icca 1.9 2.6 mA RT = 10 kΩ
SCP (pin 15) = 0 V
Test Circuit
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
HA17451A
1 µF
Note
C 330 pF
T
R 10 k
TΩSW1
CPE
VCC
RL
RL
Output 1Output 2
Note: Connect a phase compensating capacitor (at least 1 µF) to Vref.
HA17451AP/AFP
9
Characteristic Curves
3.0
2.5
2.0
1.5
1.0
0.5
0
I = 1 mA
Ta = 25°C
OUT
010 20 30 40
Reference Output Voltage vs. Supply Voltage
Supply Voltage VCC (V)
Reference Output Voltage Vref (V)
Drop-Out Voltage Vdrop (V)Output Transistor “ON” Duty (%)
Open Loop Gain AV (dB)
Phase Variation φ (deg.)
Variation RTC (%)
Reference Output Voltage Variation vs. Ambient Temperature
Ambient Temperature Ta (°C)
Frequency (Hz)
Ambient Temperature Ta (°C)
Dead Time Input Voltage VD.T.C (V)
Drop-Out Voltage vs. Ambient Temperature Open Loop Gain, Phase Variation vs. Frequency
Output Transistor “ON” Duty vs.
Dead Time Input Voltage (1)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–20 0 25 50 75 85
VCC = 6 V
IOUT = 1 mA
16151413121110 9
12345678
HA17451A
AV
1 mA
0.4
0.3
0.2
0.1
0
–20 0 25 50 75 85
Vdrop = V – Vref (V = 3 V)
V : Vref (V = 3 V) – Vref (X) > 5 mV
CC (X)
CC (X) CC
CC
100 1 k 10 k 100 k 1 M 10 M
100
90
80
70
60
50
40
30
20
10
0
V = 6 V
Ta = 25°C
CC
Av
φ
Output Transistor “ON” Duty (%)
Dead Time Input Voltage VD.T.C (V)
Output Transistor “ON” Duty vs.
Dead Time Input Voltage (2)
0
20
40
60
80
100
1.00 1.25 1.50 1.75 2.00 2.25
V = 6 V
C = 33000 pF
R = 39 k
f = 0.8 kHz
Ta = 25°C
CC
T
T Ω
OSC
0
20
40
60
80
100
1.00 1.25 1.50 1.75 2.00 2.25
V = 6 V
C = 330 pF
R = 10 k
f = 200 kHz
Ta = 25°C
CC
T
T
OSC
Ω
HA17451AP/AFP
10
Oscillator Frequency Variation vs. Ambient Temperature Oscillator Frequency vs. Timing Resistance
Standby Current vs. Supply Voltage
Supply Voltage VCC (V)
IO (mA)
tr, tf vs. IO
Undervoltage Lockout Threshold Voltage vs.
Ambient Temperature
15
10
5
0
–5
–10
–15–20 0 25 50 75 85
Ω
V = 6 V
R = 10 k
C = 330 pF
f = 200 kHz
CC
T
T
OSC
C = 330 pF
C = 3300 pF
C = 33000 pF
C =150 pF
T
300
100
10
15 10 100
V = 6 V
Ta = 25°C
CC
T
T
T
Ta
= –20°C
Ta = 25
°C
Ta
= 85°C
1615 141312 11 10 9
12345678
HA17451A
A
7
6
5
4
3
2
1
0010203040
16151413121110 9
12345678
HA17451A
4.0
3.5
3.0
2.5
2.0
–200 25507585
Vth
VtI
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Timing Resistance (kΩ)
Variation (%)
Standby Current ICCS (mA)
tr, tf (µs)
Undervoltage lockout threshold voltage
Vth, Vtl (V)
Oscillator Frequency (kHz)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
010 20 30 40 50
0
V = 6 V
C = 330 pF
R = 10 k
Ta = 25
°C
Ω
T
T
Pin 7
or
Pin 10
trtf
90%
10%
tf
tr
CC
HA17451AP/AFP
11
Timing Waveforms
Dead time
input voltage Triangle oscillator
output Error amp output
output
standstill
Reference output
of short-circuit
protection comparator
Output transistor
base waveform
(internal)
Output transistor
collector waveform
(OUT1, OUT2)
Protection enable
waveform (SCP)
Short-circuit
protection comparator
output (internal)
Reference
voltage (Vref ) Undervoltage lockout
release point
Supply voltage
(V )
CC
Power-on
Undervoltage
lockout
Notes: Voltages shown in diagram are typical values.
2.05 V
1.6 V
1.45 V
1.23 V
100%
High
Low
High (off)
Low (on)
0.61 V
0.19 V
High
Low
2.5 V
V min
3.3 V
CC
0 V
3.15 V
1.5 V
1.7 V 2.7 V
2.5 V
• Internal waveform timing diagram
HA17451AP/AFP
12
Typical System Configurations
Step-down output circuit
Switching transistor
Step-up output circuit
(using transistor in IC as switching element)
Step-up output circuit
S.C.P disable
(using external transistor
as switching element)
Inverting output circuit
Units R:
C:
L: F
H
Ω
C3
13 k
0.47 µ
C2 4.7 µ
R3 R4
18 k
C4470 p
R5
1.8 k Q1
2SB857 L1
HRP24 D1
L2
R6
36 k
R7
12 k
C5
1000 µ
V = 5 V
OUT
D2
HRP22 R12
33 k
R13
3.9 k
C8
100 µ
R11
30 k
R10
15 k
C6 0.47 µ
R
18 k
T
C
T
C7
R1
33 k
R2
33 k
C1
2.2 µ
16
1
15
2
14
3
13
4
12
5
11
6
10
7
9
8
HA17451A
V = 12 V
OUT
+
+
+
+
+
+
+
+
+
+C2
2.2 µ
R3
R4
33 k
33 k
R1
3.9 k
R2
10 k
C1
0.47 µ
63 k
R9
C
T
R
18 k
T
470 p
C6
R10
470 k
R12
820 k
L2
R11
2.2 k
Q2
2SB857
D2
HRP24 C7 470 µ
V = 15 V
OUT
V = –15 V
OUT
C5
470 µ
75 k
6.8 k
R7
R8
D1
HRP24
L1
Q1
R6
2.2 k
C4
10 µ
R5
C3 470 k
470 p
16
1
15
2
14
3
13
4
12
5
11
6
10
7
9
8
HA17451A
V = 9 V
IN
V = 9 V
IN
+
470 p
• Dual-output DC/DC converter
2SB857
2000 p
2000 p
HA17451AP/AFP
13
Precautions
Precaution concerning inverting (negative voltage) output
Conditions
Circuit diagram
R + R > |V | V
18 µA
OUT
To prevent leakage current in the IC from interfering
with stable and efficient operation, choose R and R
values that satisfy the following condition:
where, R , R :
|V |:
18 µA:
Feedback voltage resistors
Absolute value of negative output voltage
Minimum current with negative voltage
at reference voltage pin; I (min)
OUT
VIN
VCC
OUT
–VOUT
–
+
R
R
Vref
Iref
Iref
INV. INPUT
HA17451A Negative
DC output
I (min)
OR
–0.2 V 0 V Vref
OR 18 µA
21
12
1 2
12
HA17451AP/AFP
14
Package Dimensions
Hitachi Code
JEDEC
EIAJ
Mass
(reference value)
DP-16
Conforms
Conforms
1.07 g
Unit: mm
6.30
19.20
16 9
81 1.3
20.00 Max
7.40 Max
7.62
0.25
+ 0.13
– 0.05
2.54 ± 0.25 0.48 ± 0.10
0.51 Min
2.54 Min 5.06 Max
0° – 15°
1.11 Max
Hitachi Code
JEDEC
EIAJ
Mass
(reference value)
FP-16DA
—
Conforms
0.24 g
Unit: mm
*Dimension including the plating thickness
Base material dimension
*0.22 ± 0.05
*0.42 ± 0.08
0.12
0.15
M
2.20 Max 5.5
10.06
0.80 Max
16 9
18
10.5 Max
+ 0.20
– 0.30
7.80
0.70 ± 0.20
0° – 8°
0.10 ± 0.10
1.15
1.27
0.40 ± 0.06
0.20 ± 0.04
HA17451AP/AFP
15
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,
copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-
safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
Hitachi, Ltd.
Semiconductor & Integrated Circuits.
Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan
Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
Copyright Hitachi, Ltd., 2000. All rights reserved. Printed in Japan.
Hitachi Asia Ltd.
Hitachi Tower
16 Collyer Quay #20-00,
Singapore 049318
Tel : <65>-538-6533/538-8577
Fax : <65>-538-6933/538-3877
URL : http://www.hitachi.com.sg
URL NorthAmerica : http://semiconductor.hitachi.com/
Europe : http://www.hitachi-eu.com/hel/ecg
Asia : http://sicapac.hitachi-asia.com
Japan : http://www.hitachi.co.jp/Sicd/indx.htm
Hitachi Asia Ltd.
(Taipei Branch Office)
4/F, No. 167, Tun Hwa North Road,
Hung-Kuo Building,
Taipei (105), Taiwan
Tel : <886>-(2)-2718-3666
Fax : <886>-(2)-2718-8180
Telex : 23222 HAS-TP
URL : http://www.hitachi.com.tw
Hitachi Asia (Hong Kong) Ltd.
Group III (Electronic Components)
7/F., North Tower,
World Finance Centre,
Harbour City, Canton Road
Tsim Sha Tsui, Kowloon,
Hong Kong
Tel : <852>-(2)-735-9218
Fax : <852>-(2)-730-0281
URL : http://www.hitachi.com.hk
Hitachi Europe Ltd.
Electronic Components Group.
Whitebrook Park
Lower Cookham Road
Maidenhead
Berkshire SL6 8YA, United Kingdom
Tel: <44> (1628) 585000
Fax: <44> (1628) 585160
Hitachi Europe GmbH
Electronic Components Group
Dornacher Straβe 3
D-85622 Feldkirchen, Munich
Germany
Tel: <49> (89) 9 9180-0
Fax: <49> (89) 9 29 30 00
Hitachi Semiconductor
(America) Inc.
179 East Tasman Drive,
San Jose,CA 95134
Tel: <1> (408) 433-1990
Fax: <1>(408) 433-0223
For further information write to:
Colophon 2.0