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Product Detailed Parameters
- Description：IC MTR DRV BIPOLR 4.5-5.5V 16DIP
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tube
- Motor Type - Stepper：Bipolar
- Motor Type - AC, DC：-
- Function：Driver - Fully Integrated, Control and Power Stage
- Output Configuration：Half Bridge (2)
- Interface：Parallel
- Technology：Bipolar
- Step Resolution：1, 1/2, 1/4, 1/8
- Applications：General Purpose
- Current - Output：1.5A
- Voltage - Supply：4.5V ~ 5.5V
- Voltage - Load：4.5V ~ 50V
- Operating Temperature：-20°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：16-PowerDIP (0.300", 7.62mm)
- Supplier Device Package：16-DIP
- Grade：-
- Qualification：-
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Overview
The A3955SB is a full-bridge PWM microstepping motor driver designed for bipolar stepper motors. It features an integrated three-bit nonlinear DAC and internal PWM current control to support full, half, quarter, or eighth-step modes. The device provides ±1.5 A continuous output current with a 50 V voltage rating. It includes selectable fast, slow, or mixed current decay modes and internal protection circuits such as thermal shutdown, transient suppression diodes, and cross-current protection.
Feature Summary
- Integrates a three-bit nonlinear digital-to-analog converter to minimize control line requirements for microstepping applications.
- Supports selectable current decay modes including fast, slow, and mixed decay for optimized motor performance.
- Includes internal protection mechanisms such as thermal shutdown, transient suppression diodes, and cross-current protection.
Applications
- Driving bipolar stepper motors in microstepping mode
- Applications requiring high-resolution step control
- Systems needing reduced torque ripple and low-speed resonance
Procurement Notes
Verify the specific suffix 'SB' indicates the 16-pin DIP package with copper heat slug. Confirm RoHS compliance status as historical data varies by manufacturing date. Check for obsolescence notices from Allegro MicroSystems before finalizing procurement plans.
Selection Notes
Select this component when bipolar stepper motor control with integrated microstepping is required. Ensure the application voltage does not exceed 50 V and current demands remain within the ±1.5 A continuous rating. Verify that the 16-DIP package fits the target PCB layout constraints.
Part Context
This part belongs to the A3955S family of microstepping drivers. It shares functional similarities with other Allegro bipolar stepper drivers but is distinct in its specific package configuration and current handling capabilities compared to lower-power variants.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Consult manufacturer resources for direct replacements if this component is obsolete.
FAQ
How is the peak motor current determined?
Peak current is set by external current sensing resistors, reference voltage, and the internal three-bit nonlinear DAC data inputs.
What current decay modes are supported?
The device supports fast (regenerative), slow (recirculating), and mixed current decay modes.
