RT7789D [RICHTEK]

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型号：	RT7789D
厂家：	RICHTEK TECHNOLOGY CORPORATION
描述：	暂无描述
文件：	总1页 (文件大小：82K)
中文：	中文翻译
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RT7789D

PowerZero^TMMulti-Mode Flyback Controller

General Description

Features

^Proprietary PowerZero^TMTechnology

^Integrating a 700V Start-up Device

^Brown-In/Brown-Out Protection

^Proprietary SmartJitter^TMTechnology

^Reducing EMI Emissions of SMPS

^Eliminating Frequency-Jittering-Induced Output

Ripple

The RT7789Dseries is an enhanced high-efficiency multi-

mode PWM flyback controller, incorporating Richtek's

proprietary PowerZero^TMand SmartJitter^TMtechnology. The

innovative PowerZero^TMtechnology, featuring an integrated

HV device, provides an excellent green power solution,

while the SmartJitter^TMtechnology can reduce EMI

emissions of a switch-mode power supply in green mode

as well as eliminate output ripple due to frequency jittering.

Also, the RT7789D series features a multi-mode control

scheme, operating from continuous-conduction mode

(CCM) to discontinuous-conduction mode (DCM) with

valley switching, to achieve high efficiency and optimal

performance.

^Operating in Continuous-Conduction Mode (CCM),

Discontinuous-Conduction Mode (DCM), and DCM

with Valley Switching

^Accurate Over-Current Protection (OCP)

^Programmable Line Compensation

 Programmable Output OVP and UVP

 Programmable External OTP

The RT7789Dis a current-mode PWM controller for flyback

converters. It integrates comprehensive and programmable

protection features, which include brown-in/brown-out

protection, VDDover-voltage protection (VDDOVP), output

over-voltage and under-voltage protection (Output OVPand

UVP), secondary rectifier short-circuit protection (SRSP),

and external over-temperature protection (External OTP).

For constant output power regulation, a resistor connected

to CS pin can be used to achieve accurate line

compensation across the universal input voltage range.

With the above features, the RT7789D enables a cost-

effective and compact design for a wide range of AC-DC

conversion applications. It is available in a SOP-8 package.

 Driver Capability : 300mA/−300mA

 High Noise Immunity

 RoHS Compliant and Halogen Free

Applications

 SwitchingAC-DCAdapter

 NBAdapter

 PrinterAdapter

Simplified Application Circuit

OUT

AC Mains

(90V to 265V)

Option

VDD

GATE

DMAG

RT7789D

COMP

GND

is a registered trademark of Richtek Technology Corporation.

DS7789D-02 November 2018

www.richtek.com

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