UC2847J

更新时间： 2024-11-16 12:59:55

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
10页	644K
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中文翻译

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数据手册

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UC2847J 数据手册

application

INFO

UC1846/7

UC2846/7

UC3846/7

available

Current Mode PWM Controller

FEATURES

DESCRIPTION

•

Automatic Feed Forward Compensation

The UC1846/7 family of control ICs provides all of the necessary

features to implement fixed frequency, current mode control

schemes while maintaining a minimum external parts count. The

superior performance of this technique can be measured in im-

proved line regulation, enhanced load response characteristics, and

a simpler, easier-to-design control loop. Topological advantages in-

clude inherent pulse-by-pulse current limiting capability, automatic

symmetry correction for push-pull converters, and the ability to par-

allel “power modules" while maintaining equal current sharing.

•

Programmable Pulse-by-Pulse Current

Limiting

•

Automatic Symmetry Correction in Push-pull

Configuration

•

Enhanced Load Response Characteristics

Parallel Operation Capability for Modular

Power Systems

Protection circuitry includes built-in under-voltage lockout and pro-

grammable current limit in addition to soft start capability. A shut-

down function is also available which can initiate either a complete

shutdown with automatic restart or latch the supply off.

•

Differential Current Sense Amplifier with

Wide Common Mode Range

•

Double Pulse Suppression

500mA (Peak) Totem-pole Outputs

1% Bandgap Reference

Under-voltage Lockout

Soft Start Capability

Other features include fully latched operation, double pulse sup-

pression, deadline adjust capability, and a 1% trimmed bandgap

reference.

The UC1846 features low outputs in the OFF state, while the

UC1847 features high outputs in the OFF state.

Shutdown Terminal

500kHZ Operation

BLOCK DIAGRAM

5.1 V

VIN 15

REFERENCE

REGULATOR

VREF

13 VC

SYNC 10

UVLO

LOCKOUT

F/F

11 A OUT

OSC

UC1846

Output Stage

C/S-

COMP

0.5 V

UC1847

Output Inverted

C/S+

14 B OUT

0.5 mA

12 GND

E/A

INV

CURRENT

LIMIT ADJUST

16 SHUTDOWN

COMP

350 mV

6 k

UDG-02057

SLUS352A - JANUARY 1997 - REVISED MARCH 2002

12 3 4 5 6 7...10

中文翻译

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