CA3275
April 1994
Dual Full Bridge Driver
Description
The CA3275 Dual Full Bridge Driver is intended for general-
purpose applications requiring Dual Full Bridge drive or
switching, including direction and pulse-width modulation for
position control. While all features of the IC may not be uti-
lized or required, they would normally be used in instrumen-
tation systems with quadrature coils, such as air-core
gauges, where the coils would be driven at frequencies rang-
ing from 200Hz to 400Hz. The coils are wrapped at 90
o
angles for independent direction control. Coils wound in this
physical con鏗乬uration are controlled by pulse width modula-
tion, where each coil drive is a function of the sine or cosine
versus degrees of movement. The direction control is used
to change the direction of the current in the H-Driver coil.
The switch rate capability of the IC is typically 30kHz regard-
less of the inductive load. Over-current limiting is used to
limit short circuit current. Over-voltage protection (in the
range of 18V to 24V) causes the device to shut down the
output current drive. Thermal shutdown limits power dissipa-
tion on the chip. The CA3275 is supplied in a 14 lead dual-in-
line plastic package.
Features
鈥?Two Full Bridge Drivers
鈥?/div>
鹵
150mA Maximum Current
鈥?Logic Controlled Switching
鈥?Direction Control
鈥?PWM I
OUT
Control
鈥?18V Over-Voltage Protection
鈥?300mA Short-Circuit Protection
鈥?Nominal 8V to 16V Operation
鈥?Internal Voltage Regulation With Bandgap Reference
Applications
鈥?Dual Full Bridge Driver For Air Core Gauge Instrumen-
tation
鈥?/div>
碌P
Controlled Sensor Data Displays
鈥?Speedometer Displays
鈥?Tachometer Displays
鈥?Stepper Motors
鈥?Slave Position Indicators
Ordering Information
PART NO.
CA3275E
TEMPERATURE
-40
o
C to +85
o
C
PACKAGE
14 Lead Plastic DIP
Pinout
CA3275 (PDIP)
TOP VIEW
Block Diagram
COIL A- 1
V
CC
V
CC
2
3
14 COIL A+
13 GND
12 PWMA
11 DIR A
10 GND
9 GND
8 COIL B+
SENSOR &
CONVERTER
A/D, V/F, ETC
MICROPROCESSOR
PHASE, DIRECTION
& PWM CONTROL
CA3275
DUAL-H
DRIVER
LB
COS
LA
SIN
ROTOR
PWMB 4
DIR B 5
V
CC
6
COIL B- 7
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Copyright
漏
Intersil Corporation 1999
File Number
2159.3
6-3
1
2
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