A3964SLBTR

A3964SLBTR Datasheet

A3964 Dual Full-Bridge PWM Motor Driver

Part	Datasheet
A3964SLBTR	A3964SLBTR (pdf)

Related Parts	Information
A3964SLBTR-T	A3964SLBTR-T
A3964SLB-T	A3964SLB-T

PDF Datasheet Preview
A3964 Dual Full-Bridge PWM Motor Driver ±800 mA continuous output current rating 30 V output voltage rating Internal PWM current control, saturated sink drivers Internally generated, precision V reference Internal transient-suppression diodes Internal thermal-shutdown circuitry Crossover-current protection, UVLO protection Package 20 pin SOIC suffix LB Not to scale Designed for pulse width modulated PWM current control of bipolar stepper motors, the A3964 is 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 Continued on the next Functional Block Diagram LOGIC SUPPLY OUT1A OUT 1B LOAD SUPPLY OUT 2A OUT2B PWM 1 PWM 2 17 VCC PHASE 1 9 ENABLE1 10 SOURCE DISABLE ONE SHOT V REFERENCE V REF IN 18 20 UVLO & TSD 12 PHASE 2 2 11 ENABLE2 SOURCE DISABLE ONE SHOT RC1 SENSE1 REFOUT REF IN SENSE 2 RC2 29319.28g 5 6 15 16 Dwg. FP-033-1 A3964 Dual Full-Bridge PWM Motor Driver Description continued 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, transientsuppression diodes, and crossover-current protection. The A3964 is supplied in a 20-lead SOIC with internally fused pins for enhanced thermal dissipation. The package is lead Pb free with 100% matte tin leadframe plating. The power pins are at ground potential and need no electrical isolation. Selection Guide Part Number A3964SLB-T A3964SLBTR-T Packing 20-pin SOIC with internally fused pins 20-pin SOIC with internally fused pins Package 37 per tube 1000 per reel Absolute Maximum Ratings Characteristic Load Supply Voltage Logic Supply Voltage Input Voltage Sense Voltage Reference Output Current

PDF Datasheet Preview

A3964 Dual Full-Bridge PWM Motor Driver
±800 mA continuous output current rating 30 V output voltage rating Internal PWM current control, saturated sink drivers Internally generated, precision V reference Internal transient-suppression diodes Internal thermal-shutdown circuitry Crossover-current protection, UVLO protection

Package 20 pin SOIC suffix LB

Not to scale

Designed for pulse width modulated PWM current control of bipolar stepper motors, the A3964 is 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

Continued on the next

Functional Block Diagram

LOGIC SUPPLY OUT1A OUT 1B LOAD SUPPLY OUT 2A OUT2B

PWM 1 PWM 2
17 VCC

PHASE 1 9

ENABLE1 10

SOURCE DISABLE

ONE SHOT

V REFERENCE

V REF IN
18 20

UVLO & TSD
12 PHASE 2
2 11 ENABLE2

SOURCE DISABLE

ONE SHOT

RC1 SENSE1

REFOUT REF IN SENSE 2 RC2
29319.28g
5 6 15 16

Dwg. FP-033-1

A3964

Dual Full-Bridge PWM Motor Driver

Description continued
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, transientsuppression diodes, and crossover-current protection.

The A3964 is supplied in a 20-lead SOIC with internally fused pins for enhanced thermal dissipation. The package is lead Pb free with 100% matte tin leadframe plating. The power pins are at ground potential and need no electrical isolation.

Selection Guide Part Number

A3964SLB-T A3964SLBTR-T

Packing 20-pin SOIC with internally fused pins 20-pin SOIC with internally fused pins

Package 37 per tube 1000 per reel

Absolute Maximum Ratings

Characteristic

Load Supply Voltage Logic Supply Voltage Input Voltage Sense Voltage Reference Output Current

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Datasheet ID: A3964SLBTR 516029