A3958 DMOS Full-Bridge PWM Motor Driver
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|A3958 DMOS Full-Bridge PWM Motor Driver|
±2 A, 50 V continuous output rating Low rDS on outputs 270 mΩ, 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
Package B, 24-pin DIP with exposed tabs
Not to scale
Package LB, 24-pin SOIC with internally fused pins
Designed for pulse width modulated PWM current control of DC motors, the A3958 is 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 currentdecay 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.
The A3958 is supplied in a choice of two power packages, a 24-pin plastic DIP with exposed thermal tabs package suffix ‘B’ , and a 24-pin SOIC with internally fused pins package suffix ‘LB’ . In both cases, the power pins are at ground potential and need no electrical isolation. Each package type is lead Pb free, with 100% matte tin leadframe.
CP1 CP2 CP
Functional Block Diagram
CHARGE PUMP BANDGAP VDD CREG TSD
UNDERVOLTAGE & FAULT DETECT
PHASE ENABLE SYNC RECT MODE SYNC RECT DISABLE PWM MODE INT PWM MODE EXT
MODE PHASE ENABLE
REFERENCE BUFFER & DIVIDER
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