SF5778 datasheet(1/2 Pages) SIFIRST

部件名	SF5778

功能描述	Built-in 650V Power MOSFET

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制造商	SIFIRST [SIFIRST TECHNOLOGIES NANHAI LIMITED]

网页	http://www.sifirsttech.com/en/

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SiFirst_DS_5778_V1.1

FEATURES

◆ Built-in 650V Power MOSFET

◆ Meet EPS Level 6

◆ Proprietary

QR-II

TM

Technology:

●Digital Anti-jitter for Audio Noise Free

Operation

● Digital Frequency Foldback

● Digital Frequency Jittering for Better EMI

◆ Less than 100mW Standby Power

◆ Multi-Mode Operation for High Efficiency

◆ 12.7us Maximum On Time

◆ 80KHz Maximum Frequency Limit

◆ 52KHz Frequency Low Clamping in QR Mode

◆ 65% Maximum Duty Cycle

◆ Adaptive Slope Compensation for CCM Mode

◆ Built-in Soft Start Function

◆ Pin Floating Protection

◆ Built-in Synchronous Slope Compensation

◆ Cycle-by-Cycle Current Limiting

◆ Leading Edge Blanking (LEB)

◆ Constant Power Limiting

◆ VDD UVLO, OVP & Clamp

APPLICATIONS

Offline AC/DC Flyback Converter for

◆ AC/DC Adaptors

◆ SMPS Power Supply

GENERAL DESCRIPTION

SF5778 is a high performance, 2

nd Generation Quasi-

Resonant (QR-II

TM) PWM power switch for offline

flyback power converter applications. The built-in

proprietary

QR-II

TM

technology

with

high

level

protection features improves the SMPS reliability and

performance.

In SF5778, the “Digital Anti-Jitter” function can

automatically select and lock a valley at a given

loading,

which

can

achieve

audio

noise

free

operation. On the other hand, the “Digital Frequency

Jittering” function makes the system have superior

EMI performance than conventional QR system.

SF5778 is a multi mode controller. When full loadings,

the IC works in CCM mode or QR mode based on the

AC line input. When the loading goes low, the IC

enters into “Digital Frequency Foldback” mode to

boost power conversion efficiency. When the output

power is very small, the IC enters into burst mode

and can achieve less than 100mW no load power.

SF5778 integrates functions and protections of Under

Voltage

Lockout

(UVLO),

VCC

Over

Voltage

Protection (OVP), Output Over Voltage Protection

(Output OVP), Cycle-by-cycle Current Limiting (OCP),

Pin Floating Protection, Over Load Protection (OLP),

Soft Start, VCC Clamping, etc. In SF5778, the

protection

functions

are

auto-recovery

mode

protection.

SF5778 is available in DIP7 package.

TYPICAL APPLICATION

EMI

Filter

SF5778

DC Out

TL431

1

DEM

FB

2

VDD

CS

3

4

7

6

5

Drain

GND

Drain

Pin Configuration

类似零件编号 - SF5778

制造商	部件名	数据表	功能描述
SIFIRST TECHNOLOGIES NA...	SF5773	101Kb / 2P	2nd Generation Quasi-Resonant (QR-IITM ) PWM Controller
	SF5773LGT	101Kb / 2P	2nd Generation Quasi-Resonant (QR-IITM ) PWM Controller
	SF5773S	100Kb / 2P	Easily Meet EPS Level 6
	SF5773SLGT	100Kb / 2P	Easily Meet EPS Level 6

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