SF5533DP datasheet(1/2 Pages) SIFIRST

Part #	SF5533DP

Description	Less than 75mW Standby Power

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Manufacturer	SIFIRST [SIFIRST TECHNOLOGIES NANHAI LIMITED]

Direct Link	http://www.sifirsttech.com/en/

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©SiFirst Technology

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Confidential

SiFirst_DS_5533_V1.0

FEATURES

◆ Less than 75mW Standby Power

◆ Programmable OLP Debounce Time

◆ Proprietary η

-Balance

TM

Control to Boost

Light Load Efficiency

◆ Proprietary “Zero OCP/OPP Recovery Gap”

Control

◆ Proprietary

“Audio

Noise

Free

OCP

Compensation”

◆ Fixed 65KHz Switching Frequency

◆ Built-in Frequency Shuffling

◆ Built-in Soft Start Function

◆ Frequency Reduction and Burst Mode Control

for Energy Saving

◆ Built-in Synchronous Slope Compensation

◆ Cycle-by-Cycle Current Limiting

◆ Built-in Leading Edge Blanking (LEB)

◆ Current Mode Control

◆ Pin Floating Protection

◆ Very Low Startup Current

◆ Audio Noise Free Operation

◆ VDD UVLO, OVP & Clamp

APPLICATIONS

Offline AC/DC Flyback Converter for

◆ AC/DC Adaptors

◆ Open-frame SMPS

GENERAL DESCRIPTION

SF5533 is a high performance, high efficiency, highly

integrated current mode PWM controller for offline

flyback converter applications. The OLP debounce

time can be programmed in SF5533.

In SF5533, PW M switching frequency with shuffling is

fixed to 65KHz and is trimmed to tight range. When

the

output

power

demands

decrease,

the

IC

decreases

switching

frequency

based

on

the

proprietary η

-Balance

TM

control to boost power

conversion efficiency at the light load. When output

power falls below a given value, the IC enters into

burst mode and can achieve less than 75mW no load

power.

The IC can achieve “Zero OCP/OPP Recovery Gap”

using SiFirst’s proprietary control algorithm. SF5533

also has built in proprietary “Audio Noise Free OCP

Compensation”, which can achieve constant power

limiting and can achieve audio noise operation at

heavy loading when line input is around 90VAC.

SF5533 integrates functions and protections of Under

Voltage

Lockout

(UVLO),

VDD

Over

Voltage

Protection (OVP), Cycle-by-cycle Current Limiting

(OCP),

Pins

Floating

Protection,

Over

Load

Protection (OLP), Gate Clamping, VDD Clamping,

Leading Edge Blanking (LEB), Soft Start, etc.

SF5533 is available in SOT23-6 and DIP-8 packages.

TYPICAL APPLICATION

AC IN

CT

VDD

2

GATE

GND

FB

SF5533

DC Out

CS

3

1

5

4

6

TL431

Optional

Pin Configuration

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SF5533DP Datasheet(PDF) 1 Page - SIFIRST TECHNOLOGIES NANHAI LIMITED

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