Datasheet > GM3845AS8R

GM3845AS8R

更新时间： 2024-02-18 00:59:22

品牌	Logo	应用领域
GAMMA		控制器
页数	文件大小	规格书
19页	628K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

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中文翻译

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数据手册

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GM3845AS8R 数据手册

Features

Description

Low Start-Up and Operating Current

GM384XA series is high performance with fixed-frequency

current mode PWM controllers. They are specially de-

signed for off-Line and DC-to-DC converter applications.

They require minimal external components to precisely tai-

lor performance in a wide variety of applications.

Automatic Feed Forward Compensation

Current Mode Operating Frequency up to

500kHz

Trimmed Oscillator Discharge Current for

Precise Duty Cycle Control

Latching PWM for Cycle-By-Cycle Current

Limiting

GM384XA series includes a trimmed oscillator for precise

duty cycle control, a temperature-compensated reference,

high gain error amplifier, a current-sensing comparator,

and a high-current totem pole output for driving a power

MOSFET.

Undervoltage Lockout with Hysteresis

High Current Totem Pole Output

The GM384XA Have Start-up Current 0.17mA

On-chip protection features include undervoltage lockouts

with hysteresis for both input and reference, cycle-by-cycle

current limiting, programmable output deadtime, and a

latch for single pulse metering. All these are in a simple

DIP-8 or SOP-8 package!

GM3842A and GM3844A have UVLO thresholds of 16V

(on)/10V(off); GM3843A and GM3845A have UVLO thresh-

olds of 8.4V (on)/ 7.6V (off). GM3842A and GM3843Aoper-

ate within 100% duty cycle; GM3844A and GM3845A oper-

ate within 50% duty cycle.

SIMPLIFIED BLOCK DIAGRAM

5.0V

REFERENCE

ref

Undervoltage

LOCKOUT

REF

Undervoltage

LOCKOUT

R / C

OSCILLATOR

6 Output

Latching

PWM

Error

Amplifier

Voltage Feedback Input

Power Ground

Current Sense Input

Output Compensation

GND

www.gammamicro.com

12 3 4 5 6 7...19

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与GM3845AS8R相关器件

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GM38C42D8T	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C42S8R	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C42S8T	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C43	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C43D8T	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C43S8R	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C43S8T	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
GM38C44	GAMMA	获取价格	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS