Datasheet > LM3845AN

LM3845AN

更新时间： 2024-11-08 04:44:19

品牌	Logo	应用领域
韩国泰进 - HTC		控制器
页数	文件大小	规格书
7页	356K
描述
CURRENT MODE PWM CONTROLLER

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中文翻译

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数据手册

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LM3845AN 数据手册

LM3842A/3A/4A/5A

CURRENT MODE PWM CONTROLLER

FEATURES

8 SOP/ 8 DIP PIN Configulation

Compen

sation

V_REF

● Automatic feed forward compensation

● Optimized for offline converter

● Double pulse suppression

Voltage

Feedback

Vcc

Current

Sense

● Current mode operation to 500 KHz

● High gain totem pole output

OUTPUT

R_T/C_T

GND

● Internally trimmed bandgap reference

● Undervoltage lockout with hysteresis

● Low start up current :＜ 0.3 mA

ORDERING INFORMATION

Device

Package

8 SOP

8 DIP

LM3842A/3A/4A/5A D

LM3842A/3A/4A/5A N

DESCRIPTION

The LM3842A is fixed frequency current-mode PWM controller. It is specially designed for Off-Line and

DC-to-DC converter applications with minimal external components.

This integrated circuit features a trimmed oscillator for precise duty cycle control, a temperature

compensated reference, high gain error amplifier, current sensing comparator, and a high current

totempole output ideally suited for driving a power MOSFET.

Protection circuitry includes built in under-voltage lockout and current limiting.

SIMPLIFIED BLOCK DIAGRAM

Vcc

Undervoltage

V_REF

⑧

Reference

Lockout

V_REF

Undervoltage

Lockout

⑦ Vcc

Oscillator

RT/CT ④

VFB ②

⑥ Output

⑤ Ground

Latching

PWM

Error

Amplifie

③ Current

Sense

COMP ①

Input

ABSOLUTE MAXIMUM RATINGS (T_A= 25℃)

Characteristic

Power Supply Voltage

Output Current

Symbol

Value

Unit

V_cc

± 1

V_IN

I_SINK

P_D

Analog Inputes Voltage

Error Amp Output Sink Current

-0.3 to 5.5V

Power Dissipation

℃

Storage Temperature Range

Lead Temperature (soldering 5 sec)

Tstg

-65 to 150

260

HTC

12 3 4 5 6 7

中文翻译

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