CA3275 Dual Full Bridge Driver April 1994 Features Description • Two Full Bridge Drivers 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. • ± 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 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 dual-inline plastic package. • Speedometer Displays • Tachometer Displays Ordering Information • Stepper Motors • Slave Position Indicators PART NO. CA3275E Pinout TEMPERATURE -40oC to +85oC PACKAGE 14 Lead Plastic DIP Block Diagram CA3275 (PDIP) TOP VIEW COIL A- 1 14 COIL A+ VCC 2 13 GND VCC 3 12 PWMA PWMB 4 11 DIR A DIR B 5 10 GND 6 9 GND VCC COIL B- 7 LA SENSOR & CONVERTER A/D, V/F, ETC MICROPROCESSOR PHASE, DIRECTION & PWM CONTROL SIN CA3275 DUAL-H DRIVER ROTOR LB COS 8 COIL B+ CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999 6-3 File Number 2159.3 Specifications CA3275 Absolute Maximum Ratings Thermal Information 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 Resistance θJA 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 SYMBOL MIN TYP MAX UNITS Operating Supply Voltage Range VCC 8 - 16 V Supply Current (Note 1) ICC - 8 20 mA Logic Input, Low Voltage VIL - - 0.8 V Logic Input, High Voltage VIH 3.5 - - V Logic Input, Low Current, VIL = 0V IIL -10 - - µA Logic Input, High Current, VIH = 5V IIH - - 10 µA Maximum Source Saturated Voltage VSAT - High - 1.2 1.75 V Maximum Sink Saturated Voltage VSAT - Low - 0.25 0.5 V Differential VSAT Voltage, Both Outputs Saturated Diff - VSAT - 10 100 mV SYMBOL MIN TYP MAX UNITS TSC-OFF - - 2 µs TSC-F - - 2.2 µs TSC-ON - - 1 µs TSC-R - - 0.4 µs TSK-OFF - - 1.6 µs TSK-F - - 0.4 µs TSK-ON - - 0.6 µs TSK-R - - 0.2 µs INPUT LEVELS OUTPUT: RLA = RLB = 138Ω 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 6-4 CA3275 VCC SHORT CIRCUIT PROTECTION SHORT CIRCUIT PROTECTION Q1 POWER Q3 POWER DIRA COIL A– Q2 POWER PWMA COIL A+ Q4 POWER VCC SHORT CIRCUIT PROTECTION SHORT CIRCUIT PROTECTION INTERNAL VOLTAGE SUPPLY WITH BANDGAP REFERENCE OVERVOLTAGE PROTECTION AND THERMAL SHUTDOWN CIRCUITS VCC SHORT CIRCUIT PROTECTION SHORT CIRCUIT PROTECTION Q5 POWER Q7 POWER DIRB COIL B– Q6 POWER PWMB SHORT CIRCUIT PROTECTION COIL B+ Q8 POWER SHORT CIRCUIT PROTECTION FIGURE 1. CA3275 DUAL FULL BRIDGE DRIVER SCHEMATIC VCC COIL A– VCC COIL A+ 1 14 2 13 3 12 4 11 5 10 6 9 7 8 VCC PWMB PWMB DIRB DIRB VCC COIL B– RA GND PWMA DIRA LA STEP MOTOR GND GND COIL B+ LB DIRA PWMA FIGURE 2. QUADRATURE STEP-MOTOR APPLICATION SCHEMATIC 6-5 RB CA3275 VS DIR COIL DUT RL 150 PWM CL CL INCLUDES PROBE AND TEST CAPACITANCE 30pF 50% DIR PULSE 50% TEST CIRCUIT 1 90% 90% COIL OUTPUT TEST CONDITIONS: PWM = 0V, VS = 16V DIR PULSE PARAMETERS: F = 1kHz, W = 100µs, TR = TF = 1µs, AMPL = 4V 10% 10% TSC-ON TSC-R TSC-OFF TSC-F 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 150 DIR COIL DUT CL CL INCLUDES PROBE AND TEST FIXTURE CAPACITANCE 30pF PWM TEST CIRCUIT 2 PWM PULSE 50% PWM PULSE PARAMETERS: F = 1kHz, W = 100µs, TR = TF = 1µs, AMPL = 4V TSK-ON TSK-R TSK-OFF TSK-F 10% COIL OUTPUT 90% FIGURE 4. SINK SWITCHING TEST CIRCUIT AND VOLTAGE WAVEFORMS 6-6 All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil products are sold by description only. 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