A3969SETTR-T

A3969SETTR-T Datasheet

A3969 Dual Full-Bridge PWM Motor Driver

Part	Datasheet
A3969SETTR-T	A3969SETTR-T (pdf)

PDF Datasheet Preview
A3969 Dual Full-Bridge PWM Motor Driver Last Time Buy This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change November 1, 2010 Deadline for receipt of LAST TIME BUY orders April 30, 2011 Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales. NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. A3969 Dual Full-Bridge PWM Motor Driver ±650 mA continuous output current 30 V output voltage rating Internal fixed-frequency PWM current control sink drivers User-selectable blanking window Internal ground-clamp and flyback diodes Internal thermal-shutdown circuitry Crossover-current protection and UVLO protection Package 28 pin QFN suffix ET Approximate scale The A3969 is designed to drive both windings of a two-phase bipolar stepper motor. The device includes two H-bridges capable of continuous output currents of ±650 mAand operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated PWM , current-control circuitry. The peak load current limit is set by the user’s selection of a reference voltage and current-sensing resistors. The fixed-frequency pulse duration is set by a user-selected external RC timing network. 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. To reduce on-chip power dissipation, the H-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the patented output structure. The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington. Continued on the next 56 kΩ +24 V 680 pF V 20 kΩ 10 kΩ 47 uF EN2 PH2 LOGIC LOGIC EN1 PH1 A3969 Dual Full-Bridge PWM Motor Driver Description continued For each bridge, a PHASE input controls load-current polarity by selecting the appropriate source and sink driver pair. For each bridge, an ENABLE input, when held high, disables the output drivers. Special power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis, ground-clamp and flyback diodes, and crossover-current protection. TheA3969 is supplied in a 28-pin QFN lead Pb free plastic package with exposed thermal pad and 100% matte tin leadframe plating. It has a 5 x 5 mm footprint and mm nominal height. Selection Guide Packing* A3969SETTR-T Tape, 3000 pieces/reel *Contact Allegro for additional packing options Package 5 x 5 mm QFN, 28 pin Absolute Maximum Ratings Characteristic Load Supply Voltage Output Current Logic Supply Voltage Input Voltage Sense Voltage Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VBB IOUT VCC Vin

PDF Datasheet Preview

A3969 Dual Full-Bridge PWM Motor Driver

Last Time Buy

This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change November 1, 2010 Deadline for receipt of LAST TIME BUY orders April 30, 2011

Recommended Substitutions:

For existing customer transition, and for new customers or new applications, contact Allegro Sales.

NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.

A3969 Dual Full-Bridge PWM Motor Driver
±650 mA continuous output current 30 V output voltage rating Internal fixed-frequency PWM current control sink drivers User-selectable blanking window Internal ground-clamp and flyback diodes Internal thermal-shutdown circuitry Crossover-current protection and UVLO protection

Package 28 pin QFN suffix ET

Approximate scale

The A3969 is designed to drive both windings of a two-phase bipolar stepper motor. The device includes two H-bridges capable of continuous output currents of ±650 mAand operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated PWM , current-control circuitry. The peak load current limit is set by the user’s selection of a reference voltage and current-sensing resistors.

The fixed-frequency pulse duration is set by a user-selected external RC timing network. 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.

To reduce on-chip power dissipation, the H-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the patented output structure. The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington.

Continued on the next
56 kΩ
+24 V
680 pF

V 20 kΩ 10 kΩ
47 uF

EN2 PH2

LOGIC

LOGIC

EN1 PH1

A3969

Dual Full-Bridge PWM Motor Driver

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

TheA3969 is supplied in a 28-pin QFN lead Pb free plastic package with exposed thermal pad and 100% matte tin leadframe plating. It has a 5 x 5 mm footprint and mm nominal height.

Selection Guide

Packing*

A3969SETTR-T

Tape, 3000 pieces/reel
*Contact Allegro for additional packing options

Package 5 x 5 mm QFN, 28 pin

Absolute Maximum Ratings

Characteristic Load Supply Voltage

Output Current

Logic Supply Voltage Input Voltage Sense Voltage Operating Ambient Temperature Maximum Junction Temperature Storage Temperature

Symbol VBB

IOUT

VCC Vin

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived A3969SETTR-T Datasheet file may be downloaded here without warranties.

Datasheet ID: A3969SETTR-T 516030