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A3958: Full-Bridge PWM Motor Driver (PDF)
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Power Motor Drivers - Full-Bridge
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A New Serial-Controlled Motor Driver IC (PDF)
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3958: Full-Bridge PWM Motor Driver FAQ
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A3958SB Product Evaluation Kit
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A3958
DMOS Full-Bridge PWM Motor Driver
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 This classification indicates that the product is obsolete and notice has been given.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: May 3, 2010.
Deadline for receipt of LAST TIME BUY orders: October 29, 2010.
Recommended substitution: For existing customer transition, and for new customers or new applications, contact Allegro Sales.
Features
- ±2 A, 50 V Continuous Output Rating
- Low rDS(on) Outputs (270 milli-ohms, Typical)
- Programmable Mixed, Fast, and Slow Current-Decay Modes
- Serial Interface Controls Chip Functions
- Synchronous Rectification for Low Power Dissipation
- Internal UVLO and Thermal-Shutdown Circuitry
- Crossover-Current Protection
Description
Designed for pulse-width modulated (PWM) current control of dc motors, the A3958SB and A3958SLB are capable of continuous output currents to ±2 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.
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. The ENABLE input can be programmed via the serial port to PWM the bridge in fast or slow current decay. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with hysteresis, and crossover-current protection. Special power-up sequencing is not required.
A3958SLBTR-T variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 4, 2009.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3958SB-T | 24-pin DIP | Yes | view data | -20 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| A3958SLBTR-T | 24-lead SOIC | Yes | view data | -20 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
|
| APEK3958SB-01 | DEMO BOARD | No | -- | -20 °C to 85 °C | Contact Marketing Representative |
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.