A3964SB

A3964SB Datasheet


A3964SLB

Part Datasheet
A3964SB A3964SB A3964SB (pdf)
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A3964SLB A3964SLB A3964SLB
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Data Sheet
3964 DUAL FULL-BRIDGE PWM MOTOR DRIVER
3964

DUAL FULL-BRIDGE PWM MOTOR DRIVER

A3964SLB

OUT 1B 1 SENSE 1 2

OUT 1A 3 LOAD 4

SUPPLY GROUND 5
1 VBB

GROUND 6 VREF IN 7 RC 1 89 PHASE 1 9

ENABLE 1 10

PWM 1 PWM 2
20 OUT 2B
19 SENSE 2
18 OUT 2A

LOGIC SUPPLY
16 GROUND
15 GROUND
14 V REF OUT 13 RC 2 12 PHASE 2 11 ENABLE 2

Dwg. PP-047-1

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, VBB 33 V Output Current, IOUT 10 µs A*
continuous ±800 mA* Logic Supply Voltage, VCC V Logic Input Voltage Range,

VIN V to VCC + V Sense Voltage, VS V Reference Output Current,

IREF OUT mA Package Power Dissipation,

PD See Graph Operating Temperature Range,

TA to Junction Temperature, TJ Storage Temperature Range,

TS to
* Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of
† Fault conditions that produce excessive junction temperature will activate the device’s thermal shutdown circuitry. These conditions can be tolerated but should be avoided.

Designed for pulse-width modulated PWM current control of bipolar stepper motors, the A3964SB and A3964SLB are capable of continuous output currents to ±800 mA and operating voltages to 30 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. An internal precision voltage reference is provided to improve motor peak-current control accuracy. The peak load current limit is set by the user’s selection of an external resistor divider and current-sensing resistors.

The fixed off-time pulse duration is set by user-selected external RC timing networks. The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current control circuitry during switching transitions. This eliminates the need for two external RC filter networks on the current-sensing comparator inputs.

For each bridge the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. For each bridge the ENABLE input, when held high, disables the output drivers. Special power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection.

The A3964SB is supplied in a 24-pin plastic DIP with copper heat sink tabs A3964SLB is supplied in a 20-lead plastic SOIC with copper heat sink tabs. The power tabs are at ground potential and need no electrical isolation.
s ±800 mA Continuous Output Current Rating s 30 V Output Voltage Rating s Internal PWM Current Control, Saturated Sink Drivers s Internally Generated, Precision V Reference s Internal Transient-Suppression Diodes s Internal Thermal-Shutdown Circuitry s Crossover-Current Protection, UVLO Protection

Always order by complete part number:

Part Number A3964SB A3964SLB

Package 24-Pin DIP 20-Lead Wide-Body SOIC

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS PWM 1

PWM 2
3964 DUAL FULL-BRIDGE PWM MOTOR DRIVER
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Datasheet ID: A3964SB 515999