Datasheet > RT7739A

RT7739A

更新时间： 2024-01-31 10:48:53

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
1页	81K
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RT7739A 技术参数

Status：	Active	Feedback Regulation Mode：	SSR
Switching Frequency_Normal (kHz)：	65	Switching Frequency_Peak (kHz)：	130.0
Peak load Application：	Yes	HV Start-up：	No
CCM/Valley Multi-mode：	Yes	Programmable Burst/Green-mode：	No
Brown-in/out：	Yes (Buck cap.Side)	OVP：	OVP
External OTP：	Yes	UVLO ON (V)：	16.5
UVLO OFF (V)：	8	VDD OVP (V)：	27.0
Features：	Cycle-by-Cycle Current Limit;OCP;OVP;UVP	Package Type：	SOT-26

RT7739A 数据手册

RT7739

SmartJitter^TMMulti-Mode Flyback Controller

General Description

Features

^Proprietary SmartJitter^TMTechnology

^Reducing EMI Emissions of SMPS

^Eliminating Frequency-Jittering-Induced Output

Ripple

The RT7739 series is an enhanced high-efficiency multi-

mode PWM flyback controller, incorporating Richtek’s

proprietary SmartJitter^TMtechnology. The innovative

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 RT7739 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), DCM with

Valley-Switching

^Ultra-low Start-Up Current (<3μA)

^Accurate Over-Current Protection (OCP)

^Programmable Line Compensation

^Programmable Output Over-Voltage Protection

^Programmable External Over-Temperature Protection

 Programmable Bulk-Capacitor Brown-In/Brown-Out

Protection

The RT7739 is a current-mode PWM controller for flyback

converters. It integrates comprehensive and programmable

protection features, which include propagation delay

compensation, output over-voltage protection (OVP),

external over-temperature protection (OTP), and bulk-

capacitor brown-in/brown-out protection. With the above

features, the RT7739 enables a cost-effective and compact

design for a wide range ofAC-DC conversion applications.

It is available in a SOT-23-6 package.

 Driver Capability : 200mA/−300mA

 High Noise Immunity

Applications

 SwitchingAC-DCAdapter

 NBAdapter

 TV/Monitor Standby Power

 PC Peripherals

Simplified Application Circuit

O+

Mains

(90V to 265V)

O-

(Option)

VDD

DMAG

COMP

GATE

RT7739

COMP

GND

is a registered trademark of Richtek Technology Corporation.

DS7739-05 November 2018

www.richtek.com

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