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CA3275
DIRA
PWMA
VCC
INTERNAL VOLTAGE
SUPPLY WITH
BANDGAP REFERENCE
OVERVOLTAGE PROTECTION
AND THERMAL SHUTDOWN
CIRCUITS
DIRB
PWMB
VCC
SHORT
CIRCUIT
PROTECTION
Q1
POWER
SHORT
CIRCUIT
PROTECTION
Q3
POWER
COIL A–
Q2
POWER
COIL A+
Q4
POWER
SHORT
CIRCUIT
PROTECTION
SHORT
CIRCUIT
PROTECTION
VCC
SHORT
CIRCUIT
PROTECTION
Q5
POWER
SHORT
CIRCUIT
PROTECTION
Q7
POWER
COIL B–
Q6
POWER
COIL B+
Q8
POWER
SHORT
CIRCUIT
PROTECTION
SHORT
CIRCUIT
PROTECTION
PWMB
DIRB
DIRA
FIGURE 1. CA3275 DUAL FULL BRIDGE DRIVER SCHEMATIC
VCC
COIL A–
1
VCC
2
VCC
3
PWMB
4
DIRB
5
VCC
6
COIL B–
7
COIL A+
14
GND
13
PWMA
12
DIRA
11
GND
10
GND
9
COIL B+
8
RA
LA
STEP
MOTOR
LB
RB
PWMA
FIGURE 2. QUADRATURE STEP-MOTOR APPLICATION SCHEMATIC
6-5