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A3950: DMOS Full-Bridge Motor Driver (PDF)
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Power Motor Drivers - Full-Bridge
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A3950: Allegro Announces New DMOS Full-Bridge Motor Driver with Over-Current Protection
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A3950
DMOS Full-Bridge Motor Driver
Features
- Low RDS(on) outputs
- Overcurrent protection
- Motor lead short-to-supply protection
- Short-to-ground protection
- Sleep function
- Synchronous rectification
- Diagnostic output
- Internal undervoltage lockout (UVLO)
- Crossover-current protection
Description
Designed for PWM (pulse width modulated) control of dc motors, the A3950 is capable of peak output currents to ±2.8 A and operating voltages to 36 V.
PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a dc motor with externally applied PWM control signals. Internal synchronous rectification control circuitry is provided to lower power dissipation during PWM operation.
Internal circuit protection includes motor lead short-tosupply / short-to-ground, thermal shutdown with hysteresis, undervoltage monitoring of VBB and VCP, and crossover-current protection.
The A3950 is supplied in a thin profile (<1.2 mm overall height) 16 pin TSSOP package (LP), and a very thin (0.75 mm nominal height) QFN/MLP package. Both packages provide an exposed pad for enhanced thermal dissipation, and are lead (Pb) free with 100% matte tin leadframe plating.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3950SEUTR-T | 16-lead QFN/MLP | Yes | view data | -20 °C to 85 °C |
Contact Local Sales Representative or check distributor stock |
||
| A3950SLPTR-T | 16-lead TSSOP | Yes | view data | -20 °C to 85 °C |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.