1
Features
OUT1A
Thermal
Shutdown
V
REF
Overvoltage
1/2 H -Bridge
Driver
with Current
Limit
RC Filter
for PWM Input
OUT1B
C1
1/2 H -Bridge
Driver
with Current
Limit
DIRECTION
Control
1/2 H- Bridge
Driver
with Current
Limit
RC Filter
for PWM Input
1/2 H- Bridge
Driver
with Current
Limit
DIRECTION
Control
OUT2A
OUT2B
C2
Gnd
IN2
DIR2
IN1
DIR1
V
S1,2
s
2 Independent NPN
H-Bridge Drivers
s
No Analog Trim Required
s
Used in Multiplexed
Systems
s
Quiet Gauge Operation
s
Programmable Slew
Rate Minimizes
Switching Noise
s
Fault Protection
Over Voltage
Thermal Shutdown
Short Circuit
Package Options
16 Lead PDIP
(internally fused leads)
CS3750
100mA Dual H-Bridge Air-Core
Gauge Driver
1
DIR1
C1
IN1
Gnd
Gnd
OUT1A
VS1
OUT1B
DIR2
C2
IN2
Gnd
Gnd
OUT2A
VS2
OUT2B
Description
Block Diagram
Absolute Maximum Ratings
The CS3750 is a dual H-bridge four
quadrant air-core gauge driver. The IC
provides all the functions necessary to
drive a tachometer or speedometer as
part of a microprocessor based multi-
plexed system. Digital input control
eliminates the need for any analog cali-
bration of the gauge.
The controlling microprocessor sends
out a PWM signal to each H bridge
driver input (IN1, IN2). The PWM sig-
nal duty cycle is proportional to the
Hbridge output. Output current
(100mA max) direction is controlled by
the DIRECTION input. PWM switch-
ing noise is minimized at each half
bridge by an internal RC filter and
external programmable capacitor.
The CS3750 is protected against 50V
load dump, over voltage and thermal
runaway fault conditions. Any of these
faults causes the IC to shut down. Each
high side of the output driver is current
limited. A short circuit condition in one
driver does not affect the others.
CS3750
Supply Voltage .................................................................................7.5V to +16V
Internal Power Dissipation.....................................................Internally limited
Logic Input Voltages .......................................................................0.3V to 6.5V
Junction Temperature Range ...................................................40C to +150C
Storage Temperature Range .....................................................55C to +165C
Lead Temperature Soldering
Wave Solder (through hole styles only) ...........10 sec. max, 260C peak
Electrostatic Discharge (Human Body Model)............................................8kV
Rev. 7/20/95
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
A Company
2
Electrical Characteristics: 7.5V <= V
CC
<=15V; -40C T
A
+85C unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CS3750
Note 1: Time required for output signal to rise to 90% of its amplitude after input signal switches.
Note 2: Time required for output signal to decrease to 10% of its amplitude after input signal switches.
s Output Stage
V
OUT
Saturation Voltage
I
OUT
=100mA; V
IN
=0V
0.25
0.50
V
(Low Side)
I
OUT
=1mA; V
IN
=0V
0.01
0.10
V
V
OUT
Offset Voltage
V
C
=5V; I
OUT
=-30mA
15
50
mV
V
OUT
Saturation High Side
V
IN
=5V;I
OUT
=-100mA
VS-2
VS-1.5
VS
V
Low Side
V
IN
=0V;I
OUT
=-1mA
0.02
0.10
V
V
OUT
Differential
V
C
=5V, I
OUT
=-100mA
100
mV
Matching Voltage
Supply Current
V
IN
=V
DIR
=0;
23
45
mA
s Input Stage
V
IN
LOW
V
IN
decreasing; V
DIR
=0V
0.8
1.9
V
HIGH
V
IN
increasing; V
DIR
=0V
2.0
3.5
V
Hysteresis
V
DIR
=0V
100
mV
I
IN
LOW
V
IN
=0.8V; V
DIR
=0V
20
100
A
HIGH
V
IN
=3.5V
0.4
100.0
A
Output Slew Rate
V
IN
=250Hz; R
LOAD
=150
0.2
0.8
V/us
with respect to input
Output Turn on Delay
V
IN
=250Hz; R
LOAD
=150, note 1
1.5
6
s
with respect to input
Output Turn off Delay
V
IN
=250Hz; R
LOAD
=150, note 2
2.4
9
s
with respect to input
s Direction
V
DIR
LOW
V
IN
=5V; V
DIR
decreasing
0.8
1.9
V
HIGH
V
IN
=5V; V
DIR
increasing
2.0
3.5
V
Hysteresis
V
IN
=5V
100
mV
I
DIR
LOW
V
IN
=0V; V
DIR
=0.8V
40
100
A
HIGH
V
IN
=0V; V
DIR
=3.5V
0.4
100
A
Output Slew Rate
V
IN
=5V; f
DIR
=250Hz; C=0F
0.2
1.5
V/s
with respect to DIR
Output Fall Time
V
IN
=0V; V
DIR
=0V; C=0F
0.2
2.0
s
with respect to DIR
Output Turn on Delay
V
IN
=5V; R
LOAD
=150
with respect to DIR
V
DIR
=250Hz; C=0F, note 1
1
6
s
Output Turn off Delay
V
IN
=5V; R
LOAD
=150
with respect to DIR
V
DIR
=250Hz; C=0F, note 2
2.5
9
s
s Protection Functions
I
OUT
Current Limit
V
IN
=5V
100
225
mA
(High Side Only)
Over Voltage Threshold
V
IN
=5V
17.0
21.5
26.0
V
Hysteresis
0.5
V
Thermal Shutdown
160
C
Hysteresis
20
C
3
CS3750
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
16L PDIP
(internally fused leads)
1
DIR1
CMOS compatible input pin controls direction of current
through OUT1
2
C1
RC filter capacitor for OUT1 connected to Ground
3
IN1
CMOS compatible input pin controls output OUT1A and 1B
4,5,12,13
Gnd
Ground connection
6
OUT1A
One half of H-bridge output stage 1
7
VS1
Supply voltage
8
OUT1B
One half of H-bridge output stage 1
9
OUT2B
One half of H-bridge output stage 2
10
VS2
Supply voltage
11
OUT2A
One half of H-bridge output stage 2
14
IN2
CMOS compatible input pin controls output OUT2A and 2B
15
C2
RC filter capacitor for OUT2 connected to Ground
16
DIR2
CMOS compatible input pin controls direction of current
through OUT2
Each output stage contains 4 power NPN transistors
arranged in a traditional H bridge configuration. Current
flow through the two outputs (OUTxA, OUTxB) in each
H-bridge is controlled by the logic signal DIRx.
PWM input signals from the microprocessor, are filtered
on chip and sent to the output stage. The duty cycle of the
PWM signal is proportional to output voltage. The RC fil-
ter reduces the noise of the PWM input signal by slowing
its slew rate: i.e., the output signal is converted from a
square wave to an exponential sawtooth waveform. An
external capacitor (Cx) controls the slew rate for each H
bridge.
When the voltage on the control pin (INx) is low, both
halves of the H bridge are off (Table 1). When INx is high,
DIR controls the flow of current through the H-bridge. If
DIRx=0, current flows from OUTxA out to the coil and
back in through OUTxB. If DIRx=1, current flows from
OUTxB out to the coil and back in through OUTxA.
Table 1. Logic Control of H-Bridge
The high side driver transistor in each H-bridge is current
limited as a protection against a short circuit fault condi-
tion. If an over voltage or a thermal runaway fault condi-
tions occurs, all outputs shut down.
Output Stage
Motor Direction Control
Protection
Input
Direction
Outputs
INX
DIRX
OUTxA
OUTxB
0
X
0
0
1
0
1
0
1
1
0
1
Circuit Description
Application Diagram
1
IN1
C1
Gnd
Gnd
OUT1B
VS1
DIR1
C2
Gnd
Gnd
OUT2A
VS2
CS3750
DIR2
*C
1
COIL1
COIL2
Air Core
Gauge
Circular
Speedometer
*C
2
Microprocessor
I/O
* 0.047
mF
V
BAT
OUT1A
OUT2B
IN2
Part Number
Description
CS3750ENF16
16L PDIP (internally fused leads)
4
Thermal Data
16L PDIP
(internally fused leads)
R
QJC
typ
15
C/W
R
QJA
typ
50
C/W
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
Ordering Information
PACKAGE THERMAL DATA
Rev. 7/20/95
CS3750
D
Lead Count
Metric
English
Max
Min
Max
Min
16L PDIP
19.69
18.67
.775
.735
(internally fused leads)
1999 Cherry Semiconductor Corporation
Cherry Semiconductor Corporation reserves the
right to make changes to the specifications without
notice. Please contact Cherry Semiconductor
Corporation for the latest available information.
Plastic DIP (N); 300 mil wide
0.39 (.015)
MIN.
2.54 (.100) BSC
1.77 (.070)
1.14 (.045)
D
Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.
.203 (.008)
.356 (.014)
REF: JEDEC MS-001
3.68 (.145)
2.92 (.115)
8.26 (.325)
7.62 (.300)
7.11 (.280)
6.10 (.240)
.356 (.014)
.558 (.022)
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