Production£º

¡¾Part No.¡¿   A3959SB
¡¾Category¡¿   DMOS Full-Bridge PWM Motor Driver
¡¾Packing¡¿    SOIC/TSSOP
¡¾MFQ¡¿        ALLEGRO
¡¾Datasheet¡¿  A3959SB Datasheet

A3959
DMOS Full-Bridge PWM Motor Driver

Features

• ¡À3 A, 50 V Output Rating
• Low r_DS(on) Outputs (270 milliohms, Typical)
• Mixed, Fast, and Slow Current-Decay Modes
• Synchronous Rectification for Low Power Dissipation
• Internal UVLO and Thermal-Shutdown Circuitry
• Crossover-Current Protection
• Internal Oscillator for Digital PWM Timing

Description

Designed for pulse-width modulated (PWM) current control of dc motors, the A3959SB, A3959SLB, and A3959SLP are capable of output currents to ¡À3 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be adjusted via control inputs 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. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.

Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of supply and charge pump, and crossover-current protection. Special power-up sequencing is not required.

The A3959SB/SLB/SLP is a choice of three power packages, a 24-pin plastic DIP with a copper batwing tab (package suffix 'B'), a 24-lead plastic SOIC with a copper batwing tab (package suffix 'LB'), and a thin (<1.2 mm) 28-lead plastic TSSOP with an exposed thermal pad (suffix 'LP'). In all cases, the power tab is at ground potential and needs no electrical isolation. Each package is available in a leadfree version (100% matte tin leadframe).

Functional Block Diagram

Contact person:

Frances New

Phone:+86-755-81832961

Fax:+86-755-83299282

Email:sumzi@sumzi.com

MSN:sumzi_frances@msn.com

http://www.sumzi.com