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Part: CA3275E
Category:
Description: Ic-dual Full Bridge Driver
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Datasheet: Download CA3275E datasheet File size : 1382 kB
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SEMICONDUCTOR
CA3275
Dual Full Bridge Driver
Description
The CA3275 Dual Full Bridge Driver is intended for generalpurpose 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 utilized or required, they would normally be used in instrumentation systems with quadrature coils, such as air-core gauges, where the coils would be driven at frequencies ranging from 200Hz to 400Hz. The coils are wrapped at 90o angles for independent direction control. Coils wound in this physical configuration are controlled by pulse width modulation, 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 regardless 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 dissipation on the chip. The CA3275 is supplied in a 14 lead dualin-line plastic package.
April 1994
Features
· Two Full Bridge Drivers · ± 150mA Maximum Current · Logic Controlled Switching · Direction Control · PWM IOUT 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 Instrumentation · µP Controlled Sensor Data Displays · Speedometer Displays · Tachometer Displays · Stepper Motors · Slave Position Indicators
Ordering Information
PART NO. CA3275E TEMPERATURE -40oC to +85oC PACKAGE 14 Lead Plastic DIP
Pinout
CA3275 (PDIP) TOP VIEW
Block Diagram
COIL A- 1 VCC VCC 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 VCC 6
COIL B- 7
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures. Copyright
© Harris Corporation 1994
File Number
2159.3
6-3
Specifications CA3275
Absolute Maximum Ratings
Operating VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Transient VCC, 30 Seconds Maximum . . . . . . . . . . . . . . . . . . . . 24V Peak VCC, 0.4 Seconds Maximum . . . . . . . . . . . . . . . . . . . . . . . 40V Maximum Continuous Output Current, . . . . . . . . . . . . . . . . . . .±100mA Each Drive Maximum PWM Output Switching Current, . . . . . . . . . . . . . . .±150mA Each Drive
Thermal Information
Thermal Resistance JA PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100oC/W Power Dissipation, PD Up to +70oC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800mW Above +70oC . . . . . . . . . . . . . . . . . . .Derate Linearly at 10mW/oC Ambient Temperature Range Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to +85oC Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to +150oC Lead Temperature (During Soldering). . . . . . . . . . . . . . . . . . +265oC At distance 1/16 ± 1/32" (1.59 ± 0.79mm) from case for 10s max
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications TA = -40oC to +85oC, VCC = 16V Unless Otherwise Specified
PARAMETERS Operating Supply Voltage Range Supply Current (Note 1) INPUT LEVELS Logic Input, Low Voltage Logic Input, High Voltage Logic Input, Low Current, VIL = 0V Logic Input, High Current, VIH = 5V OUTPUT: RLA = RLB = 138 Maximum Source Saturated Voltage Maximum Sink Saturated Voltage Differential VSAT Voltage, Both Outputs Saturated VSAT - High VSAT - Low Diff - VSAT 1.2 0.25 10 1.75 0.5 100 V V mV VIL VIH IIL IIH 3.5 -10 0.8 10 V V µA µA SYMBOL VCC ICC MIN 8 TYP 8 MAX 16 20 UNITS V mA
Switching Specifications
PARAMETERS SOURCE CURRENT (See Figure 3) Turn-Off Delay Fall Time Turn-On Time Rise Time SINK CURRENT (See Figure 4) Turn-Off Delay Fall Time Turn-On Time Rise Time NOTE: 1. No load, PWMA = PWMB = 5V, DIR A = DIR B = 0V TSK-OFF TSK-F TSK-ON TSK-R 1.6 0.4 0.6 0.2 µs µs µs µs TSC-OFF TSC-F TSC-ON TSC-R 2 2.2 1 0.4 µs µs µs µs SYMBOL MIN TYP MAX UNITS
6-4
CA3275
VCC
SHORT CIRCUIT PROTECTION Q1 POWER DIRA
SHORT CIRCUIT PROTECTION Q3 POWER
COIL A Q2 POWER
COIL A+ Q4 POWER
PWMA
VCC SHORT CIRCUIT PROTECTION SHORT CIRCUIT PROTECTION
INTERNAL VOLTAGE SUPPLY WITH BANDGAP REFERENCE OVERVOLTAGE PROTECTION AND THERMAL SHUTDOWN CIRCUITS SHORT CIRCUIT PROTECTION
VCC
SHORT CIRCUIT PROTECTION Q7 POWER
Q5 POWER DIRB COIL B PWMB Q6 POWER
COIL B+ Q8 POWER
SHORT CIRCUIT PROTECTION
SHORT CIRCUIT PROTECTION
FIGURE 1. CA3275 DUAL FULL BRIDGE DRIVER SCHEMATIC
VCC
COIL A VCC VCC 3 PWMB DIRB VCC 6 COIL B 7 9 8 PWMB 4 DIRB 5 10 11 12 1 2 14 13
COIL A+ GND PWMA DIRA GND GND COIL B+
RA
LA
STEP MOTOR
LB DIRA
RB
PWMA
FIGURE 2. QUADRATURE STEP-MOTOR APPLICATION SCHEMATIC
6-5
CA3275
VS
DIR DUT PWM RL 150 CL 30pF
COIL CL INCLUDES PROBE AND TEST CAPACITANCE
50% TEST CIRCUIT 1
50%
DIR PULSE
90% TEST CONDITIONS: PWM = 0V, VS = 16V DIR PULSE PARAMETERS: F = 1kHz, W = 100µs, TR = TF = 1µs, AMPL = 4V
90% COIL OUTPUT
10% TSC-ON TSC-R TSC-OFF TSC-F
10%
TSC-OFF
TSC-F
TSC-ON
TSC-R
90%
90% COIL OUTPUT 10% 10%
FIGURE 3. SOURCE SWITCHING TEST CIRCUIT AND VOLTAGE WAVEFORMS
TEST CONDITIONS: VS = 16V DIR = 0V WHEN TESTING COIL - OUTPUT DIR = 4V WHEN TESTING COIL + OUTPUT
VS
RL DIR DUT PWM
150 COIL
CL CL INCLUDES PROBE AND TEST FIXTURE CAPACITANCE 30pF
TEST CIRCUIT 2
50% PWM PULSE PARAMETERS: F = 1kHz, W = 100µs, TR = TF = 1µs, AMPL = 4V TSK-ON TSK-R TSK-OFF TSK-F
PWM PULSE
10% COIL OUTPUT 90%
FIGURE 4. SINK SWITCHING TEST CIRCUIT AND VOLTAGE WAVEFORMS
6-6
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