CA3275 Datasheet, PDF (1/5 Pages) Intersil Corporation – Dual Full Bridge Driver

CA3275
April 1994
Dual Full Bridge Driver
Features
Description
• Two Full Bridge Drivers
• ± 150mA Maximum Current
• Logic Controlled Switching
• Direction Control
• PWM I_OUT Control
• 18V Over-Voltage Protection
• 300mA Short-Circuit Protection
• Nominal 8V to 16V Operation
• Internal Voltage Regulation With Bandgap Reference
Applications
• Dual Full Bridge Driver For Air Core Gauge Instrumen-
tation
• µP Controlled Sensor Data Displays
• Speedometer Displays
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 configuration 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.
• Tachometer Displays
• Stepper Motors
Ordering Information
• Slave Position Indicators
PART NO.
CA3275E
TEMPERATURE
-40^oC to +85^oC
PACKAGE
14 Lead Plastic DIP
Pinout
CA3275 (PDIP)
TOP VIEW
Block Diagram
COIL A- 1
V_CC 2
V_CC 3
PWMB 4
DIR B 5
V_CC 6
COIL B- 7
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
LA SIN
ROTOR
LB COS
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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