Datasheet > RT7781G

RT7781G

更新时间： 2024-01-23 07:18:09

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
1页	48K
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数据手册

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RT7781G 技术参数

Status：	Active	Feedback Regulation Mode：	SSR
Switching Frequency_Normal(kHz)：	65	Switching Frequency_Peak(kHz)：
Peak load Application：	No	HV Start-up：	Yes(w/i X-CAP discharge)
CCM/Valley Multi-mode：	Yes	Programmable Burst/Green-mode：	No
Brown-in/out：		OVP：	OVP
External OTP：	Yes	UVLO ON(V)：	16.5
UVLO OFF(V)：	9	VDD OVP(V)：	27.0
Features：		Package Type：	SOP-7

RT7781G 数据手册

RT7781

PowerZero^TMSeries PWM Flyback Controller

Features

General Description

 PowerZero^TMTechnology

^Integrated 700V Start-Up Device

^Brown-In and Brown-Out

The RT7781 is a series of high-performance current mode

PWM controllers with Richtek proprietary PowerZero^TM

technology. The PowerZero^TMprovides an excellent green

power solution, especially under light-load and no-load

conditions. The integrated high-voltage device provides

fast start-up function without external start-up resistors.

It also features brown-in and brown-out detection.

 Low No-Load Input Power (<50mW) (RT7781G/L/A/C)

 Low No-Load Input Power (<30mW) (RT7781T)

 Accurate Over Load Protection

 Driver Capability : 400mA/−400mA

 PRO Pin for Arbitrary External Protection

(RT7781G/L/A/T)

The RT7781 offers complete protection functions such as

internal Over-Temperature Protection (OTP), Over-Load

Protection (OLP) and VDDOver-Voltage Protection (OVP).

It also features Secondary Rectifier Short-circuit

Protection (SRSP) and Current Sensing pin (CS) open-

circuit protection. Due to these protections, design of

power supply unit becomes simple and reliable.

 ACD Pin for TV Application (RT7781C)

 Disable Mode for 30mW Solution (RT7781T)

 Jittering Frequency

 Soft Driving for Reducing EMI Noise

 VDD Over Voltage Protection

 Internal Over Temperature Protection

 Secondary Rectifier Short Protection

 CS Pin Open Protection

The RT7781 provides several versions, shown in the

RT7781 version table, for various applications. It is targeted

for cost-effective and compact power supply units such

as NB adaptors.

 RoHS Compliant and Halogen Free

Applications

 NBAdaptor

Marking Information

RT7781xGS : Product Number

 SwitchingAC/DCAdaptor with LowNo-Load Input Power

 TV and MonitorApplications

 Open Frame Power Supply

RT7781x

GSYMDNN

x :G/L/A/T/C

YMDNN : Date Code

Simplified Application Circuit

OUT+

AC Mains

(90V to 265V)

OUT-

RT7781

VDD

OPTO

PRO

GATE

OPTO

COMP

GND

is a registered trademark of Richtek Technology Corporation.

DS7781-03 April 2014

www.richtek.com

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