3957
FEATURES s s s s s s s s s ±1.5 A Continuous Output Current 50 V Output Voltage Rating Internal PWM Current Control 4-Bit Non-Linear DAC for 16-Bit Microstepping Satlington™ Sink Drivers Fast, Mixed Fast/Slow, and Slow Current-Decay Modes Internal Transient-Suppression Diodes Internal Thermal-Shutdown Circuitry Crossover-Current and UVLO Protection
Always order by plete part number:
Part Number A3957SA A3957SLB Package 16-pin DIP 24-lead batwing SOIC RθJA 60°C/W 56°C/W RθJC 38°C/W
- RθJT
- 6°C/W
3957 FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM (A3957SLB shown)
LOGIC SUPPLY LOAD SUPPLY
OUTA
PHASE 10
9 VCC
VBB GROUND 6 7 18 19
UVLO & TSD
MIXED-DECAY PARATOR
PWM LATCH
BLANKING GATE
CURRENT-SENSE PARATOR
OUTB
SENSE 17
+
- BLANKING
R Q S +
- RC 5 V TH 3 8 11 ÷3
+
- D/A
DISABLE
RS 13 20
D1
A3957SA
GROUND D0 OUTB LOAD SUPPLY PFD REF RC GROUND 1 2 3 4 VBB 5...
