Ordering number : ENN7318
20203AS (OT) No. 7318 -1/14
Overview
The LB11947 is a PWM current control DC motor driver
with 5-V switching regulator. This IC can simultaneously
drive two DC motors. It is especially suitable for the
applications of DC motors that control motor speed with
direct PWM technique using external control signals.
Functions
(DC motor drive)
• Driving two DC motors
• External PWM control function
• Internal PWM current control (OFF time fixed)
• Current decay switching function (SLOW DECAY and
FAST DECAY modes)
• Noise canceling function
• Output Tr upper diode incorporated (with external lower
side Schottky diode)
• Thermal shutdown circuit incorporated (with a heat
generation warning function)
• Logic low-voltage OFF circuit incorporated
(Switching regulator)
• PWM oscillation frequency variable (external C
necessary)
• Soft start function (external C necessary)
• Over-current protection function
Package Dimensions
unit: mm
3147C-DIP28H
114
28 15
0.4
0.6
4.04.0
26.75
20.0
R1.7
8.4
(1.81) 1.78 1.0
12.7
11.2
SANYO: DIP28H (500 mil)
[LB11947]
LB11947
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
PWM Current Control DC Motor Driver/
5 V Switching Regulator
Monolithic Digital IC
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
No. 7318 -2/14
LB11947
Parameter Symbol Conditions Ratings Unit
Supply voltage VBB 10 to 45 V
Reference voltage VREF 0.0 to 3.0 V
OSC oscillation frequency fosc 50 to 100 kHz
Recommended Operating Conditions at Ta = 25°C
1.56
0
0.5
1
1.5
2
2.5
3
3.5
–20 0 20 40 60 80 100
Ambient Temperature, Ta – °C
Allowable Power Dissipation, Pd max – W
Pd max – Ta
Independent IC
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage VBBmax 50 V
Output peak current IOPEAK Tw ≤20µs 1.75 A
Output continuous current Iomax 1.5 A
Logic input voltage range VIN –0.3 to VCC + 0.3 V
Emitter output maximum voltage VEmax 1.0 V
VREF pin input voltage range VREF PWM = “L”, Motor driver not operating –0.3 to VCC + 0.3 V
Operating temperature Topr –20 to +85 °C
Storage temperature Tstg –55 to +150 °C
Allowable internal loss Pdmax Independent IC 3.0 W
Specifications
Absolute Maximum Ratings at Ta = 25°C
No. 7318 -3/14
LB11947
Parameter Symbol Conditions Ratings Unit
min typ max
Standby current dissipation IBB ST ST = L 3 4.5 6 mA
Operating current dissipation IBB ON ST = H, Motor driver no-load 7 10 13 mA
Motor Driver Block
Output saturation voltage 1 VOSAT 1 IO= +1.0 A, sink 1.2 1.5 V
Output saturation voltage 2 VOSAT 2 IO= +1.5 A, sink 1.5 1.8 V
Output saturation voltage 3 VOSAT 3 IO= –1.0 A, source 1.9 2.3 V
Output saturation voltage 4 VOSAT 4 IO= –1.5 A, source 2.2 2.5 V
Output leak current IO1 (leak) ST = 0 V, VO= VBB, sink 50 µA
IO2 (leak) ST = 0 V, VO= 0 V, source –50 µA
Output sustaining voltage VSUS L = 26.6 mH, IO= 1.5 A *150 V
VIH Ta = 25°C 2 V
Logic input voltage VIL Ta = 25°C 0.8 V
(PWM,PHASE,MD,ST) VIHT Ta = –20 to 85°C *1 2 V
VILT Ta = –20 to 85°C *1 0.8 V
IIH VIH = VCC 60 90 120 µA
Logic input current IIL VIL = 0.8 V 5 10 15 µA
(PWM,PHASE,MD,ST) IIHT VIH = VCC, Ta = –20 to 85°C *140 150 µA
IILT VIH = 0.8 V, Ta = –20 to 85°C *1 3 20 µA
VE25 VREF = 2.5 V 0.483 0.5 0.513 V
Sense voltage VE10 VREF = 1.0 V 0.190 0.2 0.210 V
VE05 VREF = 0.5 V 0.092 0.1 0.108 V
Reference current Iref Vref = 1.0 V –0.5 0.5 µA
CR pin current ICR CR = 1.0 V –1.38 –1.15 –0.92 mA
Minimum noise cancel time tNC C = 2200pF, R = 16 kΩ*2 5 µs
Output delay time tDO PWM →output delay time *3 1.2 µs
tDOT Ta = –20 to 85°C *1 1.2 µs
Measurement of through current ITR Pulse width of 500 ns or more *4 1 A
Logic OFF voltage VLSDOFF 6.4 8 9.6 V
LVSD hysteresis width VLHIS 0.77 1.1 1.43 V
TEO pin saturation voltage VsatTEO Iload = –3 mA, Ta = 150°C *1 0.45 V
Heat-generation warning temperature
TE *1135 °C
Thermal shutdown temperature TSD *1 180 °C
Switching Regulator Block
Output voltage VCC 4.85 5.0 5.15 V
Fluctuation of supply voltage ∆VCC1VBB = 10 to 45 V 50 mV
Load fluctuation ∆VCC2 IO= 0 to 0.5 A 50 mV
Output over-current Detection threshold voltage
VtIP 0.45 0.5 0.55 V
Over-current detection delay time TdIP fosc = 50kHz 80 µs
OSC pin charge current Icosc V(OSC) = 1.0 V –24 –20 –16 µA
OSC pin discharge current Idosc V(OSC) = 2.5 V 16 20 24 µA
OSC maximum oscillation frequency
Foscmax 100 kHz
Soft start charge current Iss V(CSS) = 0 V 2 3 4 µA
Electrical Characteristics at Ta = 25°C, VBB = 45 V, VREF = 1.0 V
* Note 1: Design guarantee
* Note 2: Measurement of minimum noise canceling time
No. 7318 -4/14
LB11947
PWM
CR
4V
TNC
1µs
VM = 45 V, VREF = 2.5 V, C = 2200pF, R = 16 kΩ
Enter the PWM “L” pulse width of 1µs and measure the time TNC from PWM rise to the CR pin voltage of 4 V.
* Note 3: Output delay time measurement
PWM
OUT
40V
TDO1
5V
TDO2
VM = 45 V, PH = “H”, CR = 0V
Measure the time TDO1 from PWM = “H” →“L” fall to the output fall to 5 V and TDO2 from PWM = “L” →“H” rise
to the output rise to 40 V. Measure these times for OUTA, OUTAB, OUTB, and OUTBB respectively.
* Note 4: Measurement of through current
PHASE
Pin E
1A
500ns
Measure the current flowing to pin E during phase switching of “H” →“L” and “L” →“H” after its conversion to the
voltage with a detection resistor.
The current exceeding the current value of 1A at the pulse width of 500 ns or more is judged to be NG as the through
current.
No. 7318 -5/14
LB11947
Pin functions description
Pin Name Pin No. Functions
OUTBB 1 DC motor, BB output pin
EB 2 DC motor Bch, current sense resistor connection pin
DCO 3 Switching regulator, control transistor output pin
VCC 4 Switching regulator, 5 V voltage output pin
IPSEN 5 Switching regulator, over-current detection resistor connection pin
VBB 6 Supply voltage connection pin
VMB 7 DC motor Bch, motor load current supply power connection pin
CSS 8 Switching regulator, soft start capacitor connection pin
TEO 9 Heat generation warning output, open collector pin
OSC 10 Switching regulator, switching frequency decesion capacitor connection pin
ST 11 DC motor, standby input pin
CRB 12 DC motor Bch, noise cancel, TOFF time setting C and R connection pin
VREFB 13 DC motor Bch, current setting reference voltage input pin
CRA 14 DC motor Ach, noise cancel, TOFF time setting C and R connection pin
VREFA 15 DC motor Ach, current setting reference voltage input pin
MDB 16 DC motor Bch, current decay mode switching pin (for PWM = “L” only)
PWMB 17 DC motor Bch, PWM input pin
PHB 18 DC motor Bch, phase switching input pin
MDINT 19 DC motor, current decay mode switching pin (for PWM = “H” only)
MDA 20 DC motor Ach, current decay mode switching pin (for PWM = “L” only)
PWMA 21 DC motor Ach, PWM input pin
PHA 22 DC motor Ach, phase switching input pin
GND 23 GND connection pin
VMA 24 DC motor Ach, motor load current supply power connection pin
EA 25 DC motor Ach, current sense resistor connection pin
OUTA 26 DC motor, A output pin
OUTAB 27 DC motor, AB output pin
OUTB 28 DC motor, B output pin
Pin Assignment
2728 2526 2324 1819202122 151617
118 9 10 1413126 74 51 2 3
CSS
TEO
VCC
ST
IPSEN
OSC
DCO
CRB
VREFB
CRA VREFA
MDB
PWMB
PHB
MDINT
MDA
PWMA
PHA
GND
OUTB
OUTAB
OUTA
EA
VMA
VBB
VMB
EB
OUTBB
LB11947
Descriptions of Each Function
(Switching regulator, over-current limit operation time chart)
No. 7318 -6/14
LB11947
VBB
VCC
CSS
IPSEN
OSC
Logic RESET
9V
“HI” RESET
Output OFF latch Output OFF latch cancelled Output OFF latch Latch canceling
8V
1.3V
Mask threshold level
Over-current
mask width
Charge mask section
Over-current
detection threshold
Over-current
detection output
45V
5V
4V
VCC OFF
Soft start
The DC/DC over-current limit value is determined from the resistor connected between VBB and current sense pin.
Current limit value = 0.5(V)/RL
Using about 75% from the upper threshold to lower threshold of the OSC triangular oscillation waveform and using the
mask circuit within the OSC charge section, the output of the over-current detection comparator is masked. This can
prevent detection error due to output switching noise.
When over-current flows through the output transistor, this over-current is detected if the ON width exceeding the over-
current detection threshold of IPSEN pin is more than the mask width. The counter is activated when over-current is
detected. If over-current is detected further after counting of four shots of OSC oscillation frequency, the output
transistor is turned OFF and latched in this condition. If no over-current is detected up to the eighth shot after counting
of four shots, the over-current condition is determined to be cancelled and the counter is reset, but the output transistor is
not turned OFF.
If the output transistor is latched to the OFF condition, recharge of VBB power supply causes canceling of the latch
condition.
(Switching regulator, soft start function)
When the VCC output is about to rise to the target voltage of 5 V instantaneously at start of switching regulator (at VBB
power ON), the IC output pulse operates with the maximum duty, causing the rush current to flow to the output
transistor. It is therefore necessary to raise the VCC target voltage gradually so that the output does not operate with the
maximum duty.
Connection of a capacitor between the CSS pin (pin 8) and GND allows slow rising of VCC output (soft start) when
VBB power is applied.
The soft start time (tss) is approximately set by the following equation.
tss .
=
. 1.4 ×C/Iss
tss: Soft start time [s]
Iss: Soft start charge current [µA]
C: CSS pin capacitor [µF]
(Switching regulator, switching frequency set time)
The switching frequency of switching regulator is varied by changing the capacitor connected between the OSC pin (pin
10) and GND.
The switching frequency (fosc) is set approximately by the following equation. Since this equation is the approximate
expression, check it in the mounted condition when it is to be used at a particularly high frequency.
fosc .
=
. {1/C(1/Icosc+1/Idosc)} ×10–3
fosc: Switching frequency [kHz]
Icosc: OSC pin charge current [µA]
Idosc: OSC pin discharge current [µA]
C: OSC pin capacitor [pF]
No. 7318 -7/14
LB11947
VBB
CSS
VCC
tss
5V
1.4V
9V
(Motor driver, logic input truth table)
(Motor driver, output stage transistor operation mode)
The figure above shows the current direction at PH = “H.”
Note that the upper diode is incorporated and the lower diode is an external Schottky diode.
(Motor driver, output stage transistor operation function)
No. 7318 -8/14
LB11947
(*) Don’t care.
ST PWM MD MDINT PH OUT OUT- Operation mode
L* * * * OFF OFF Standby mode (circuit OFF)
H H *H H H L SLOW (short brake) at power ON, forward rotation, and at the current limit
H H *L H H L FAST (all OFF) at power ON, forward rotation, and at current limit
H H *H L L H SLOW (short brake) at power ON, reverse rotation, and at current limit
H H *L L L H FAST (all OFF) at power ON, reverse rotation, and at current limit
H L H * * L L Current decay at SLOW (short brake)
H L L * * OFF OFF Current decay at FAST (all OFF)
Charge Fast Slow
RS
VM
U1
L1 L2
U2
ON OFF
OFF
RS
VM
U1
L1 L2
U2
OFF
OFF OFF
OFF
RS
VM
U1
L1 L2
U2
OFF
OFF
ON ON ON
Mode U1 U2 L1 L2
CHARGE(PH = “H”) ON OFF OFF ON
CHARGE(PH = “L”) OFF ON ON OFF
FAST OFF OFF OFF OFF
SLOW OFF OFF ON ON
(Motor driver, internal PWM current control operation mode)
PWM current control is made, so that the peak current flowing through the motor coil with PWM = “H” does not exceed
the current level swt with VREF pins (pin 15 (Ach) and pin 13 (Bch)).
<MDINT = “L” (FAST mode>
No. 7318 -9/14
LB11947
Coil current
CR
Set current
CHARGE mode FAST mode
Tnc Toff
CHARGE mode FAST mode
4V
1V
PWM
Tnc Toff
Coil current
CR
Set current
CHARGE mode SLOW mode
Tnc Toff
CHARGE mode SLOW mode
4V
1V
PWM
Tnc Toff
<MDINT = “H” (SLOW mode)>
Tnc: Noise canceling time [s]
Toff: Switching OFF time [s]
(Switching OFF time and noise canceling time set method)
Connection of C and R between CRA pin (pin 14), CRB pin (pin 12) and GND allows setting of the switching OFF time
and noise canceling time.
The noise canceling time Tnc and switching OFF time Toff is set approximately by the following equation.
[Noise canceling time Tnc]
Tnc .
=
.C • R • ln{(1–RI)/(4–RI)}[s]
[Switching OFF time Toff]
Toff .
=
.– C • R • ln(1/4.8) [s]
I : CR pin charge current [A]
C: CR pin external capacitor [F]
R : CR pin external resistor [Ω]
(Peak coil current set method)
The peak current value (set current) flowing through the motor coil is set by the sense resistor to sense the current
connected between EA pin (pin 25), EB pin (pin 2) and GND and by the reference voltage applied to VREFA pin (pin
15) and VREFB pin (pin 13).
Ipeak = Vref/(5 ×Rs)
Ipeak : Set current [A]
Vref : VREF pin application voltage [V]
Rs : Current sense resistor [Ω]
No. 7318 -10/14
LB11947
(Motor driver, output transistor operation time chart)
MDINT = “H”, MD = “H” (SLOW, SLOW)
No. 7318 -11/14
LB11947
PHASE
PWM
OUTA upper Tr
OUTA upper Tr
OUTA lower Tr
OUTA lower Tr
CR
H
L
ON
ON
OFF
OFF
CHG SLOW CHG OFF(SLOW) CHG SLOWCurrent mode
1µs or less 1µs or less
1µs or less 1µs or less 1µs or less 1µs or less
1µs or less 1µs or less
PHASE
PWM
CR
H
L
OFF
OFF
CHG FAST CHG OFF(FAST) CHG FASTCurrent mode
OFF
OFF
OUTA upper Tr
OUTA upper Tr
OUTA lower Tr
OUTA lower Tr
1µs or less 1µs or less 1µs or less 1µs or less
1µs or less
MDINT = “L”, MD = “L” (FAST, FAST)
No. 7318 -12/14
LB11947
PHASE
PWM
CR
H
L
ON
ON
OFF
OFF
CHG FAST CHG OFF(SLOW) CHG FASTCurrent mode
OUTA upper Tr
OUTA upper Tr
OUTA lower Tr
OUTA lower Tr
1µs or less
1µs or less 1µs or less 1µs or less 1µs or less
1µs or less
PHASE
PWM
CR
H
L
OFF
OFF
CHG SLOW CHG OFF(FAST) CHG SLOWCurrent mode
OFF
OFF
OUTA upper Tr
OUTA upper Tr
OUTA lower Tr
OUTA lower Tr
1µs or less 1µs or less
1µs or less 1µs or less 1µs or less
1µs or less
1µs or less
MDINT = “H”, MD = “L” (SLOW, FAST)
MDINT = “L”, MD = “H” (FAST, SLOW)
Block Diagram
No. 7318 -13/14
LB11947
MD
Control logic
circuit
PHA
ST
PWM
VMB
OUT OUTA
CRAEA
VREF 1/5 ATT One-shot
multi
blanking
time
GND
MDB
Control logic
circuit
PHB
PWM
VMA OUT
OUTB
CRB EB
Thermal shutdown
circuit
UVLO
VREF
OSC
DCO
SOFT
START
1/5 ATT
CSS
CURRENT
LIMITTER
OSC
M M
VBB
VCC
VBB
One-shot
multi
blanking
time
VCC
TEO IPSEN
VBB
MDIN
16kΩ2000pF
0.51Ω0.51Ω
16kΩ
2000pF
0.51Ω
200pF
0.1µF470µF
470µH
SB SB SB SB
*The external constant is reference and may vary depending on the motor to be connected. Check with care when determining the constant.
PS No. 7318 -14/14
LB11947
This catalog provides information as of February, 2003. Specifications and information herein are subject
to change without notice.
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
guaranteed for volume production. SANYO believes information herein is accurate and reliable, but
no guarantees are made or implied regarding its use or any infringements of intellectual property rights
or other rights of third parties.
