3958 datasheet, PDF - EEWORLD Datasheet

3958: Descriptiondmos full-bridge pwm motor driver; File Size174KB，12 Pages; ManufacturerAll Sensors

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3958 Overview

dmos full-bridge pwm motor driver

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3958

A3958SLB

CP2

CP1

PHASE

OSC

GROUND

LOGIC SUPPLY

ENABLE

DATA

CLOCK

STROBE

CHARGE PUMP

DMOS FULL-BRIDGE PWM

MOTOR DRIVER

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.

The A3958SB/SLB is supplied in a choice of two power

packages, a 24-pin plastic DIP with a copper batwing tab (package

suffix ‘B’), and a 24-lead plastic SOIC with a copper batwing tab

(package suffix ‘LB’). In both cases, the power tab is at ground

potential and needs no electrical isolation.

Data Sheet

29319.31

REG

RANGE

CONNECTION

OUT

LOAD SUPPLY

GROUND

SENSE

OUT

CONNECTION

MODE

REF

LOGIC

SERIAL PORT

Dwg. PP-069

Note that the A3958SLB(SOIC) and A3958SB

(DIP) do not share a common terminal

assignment.

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, V

..................

50 V

Output Current, I

OUT

........................

2.0 A

Logic Supply Voltage, V

................

7.0 V

Input Voltage, V

....

-0.3 V to V

+ 0.3 V

Sense Voltage, V

............................

0.5 V

Reference Voltage, V

REF

..................

2.7 V

Package Power Dissipation (T

= 25°C), P

A3958SB .................................

3.1 W*

A3958SLB ...............................

2.2 W*

Operating Temperature Range,

...............................

-20

C to +85

Junction Temperature,

............................................

+150

Storage Temperature Range,

.............................

-55

C to +150

Output current rating may be limited by duty cycle,

ambient temperature, and heat sinking. Under any

set of conditions, do not exceed the specified

current rating or a junction temperature of 150°C.

* Per SEMI G42-88 Specification.

FEATURES

±2

A, 50 V Continuous Output Rating

Low

DS(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

Always order by complete part number:

Part Number

A3958SB

A3958SLB

Package

24-pin batwing DIP

24-lead batwing SOIC

θJA

40°C/W

56°C/W

θJT

6°C/W

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