Datasheet > SI9978DW-T1-E3

SI9978DW-T1-E3

更新时间： 2024-09-14 21:55:55

品牌	Logo	应用领域
威世 - VISHAY		驱动器
页数	文件大小	规格书
6页	68K
描述
Configurable H-Bridge Driver

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SI9978DW-T1-E3 数据手册

Si9978

Vishay Siliconix

Configurable H-Bridge Driver

FEATURES

D H-Bridge or Dual Half-Bridge Operation

D 20- to 40-V Supply

D Cross-Conduction Protected

D Current Limit

D ESD Protected

D Fault Output

D Static (dc) Operation

D Undervoltage Lockout

DESCRIPTION

The Si9978 is an integrated driver for an n-channel MOSFET

H-bridge. The mode control allows operation as either a full

H-bridge driver or as two independent half-bridges. The

DIR/PWM input configuration allows easy implementation of

either sign/magnitude or anti-phase PWM drive schemes for

full H-bridges. Schmitt triggers on the inputs provide logic

signal compatibility and hysteresis for increased noise

immunity. An internal low-voltage regulator allows the device

to be powered directly from a system supply of 20 to 40 volts.

All n-channel gates are driven directly from low-impedance

outputs. The addition of one external capacitor per half-bridge

allows internal circuitry to level shift both the power supply and

logic signal for the high-side n-channel gate drives. Internal

charge pumps replace leakage current lost in the high-side

driver circuits to provide “static” (dc) operation in any output

condition. Protection features include an undervoltage

lockout, cross-conduction prevention logic, and overcurrent

monitors.

The Si9978 is available in both standard and lead (Pb)-free,

24-pin wide-body SOIC (surface mount) packages, specified

to operate over the industrial (−40 to +85_C) temperature

range.

FUNCTIONAL BLOCK DIAGRAM

Bootstrap Reg.

V+

CAP

Charge Pump

Low-Voltage

Regulator

CAP

High-Side

U.V. Lockout

Low-Side

U.V. Lockout

Bootstrap Reg.

Charge Pump

CAP

DIR/IN

QS/IN

Input

Logic

PWM/EN

MODE

BRK

EN/EN

CL/FAULT

GND

FAULT/FAULT

−

One Shot

R /C

IL +

−

R /C

One Shot

IL +

Document Number: 70011

S-40804—Rev. E, 26-Apr-04

www.vishay.com

12 3 4 5 6

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