SF1560 데이터시트 PDF

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SF1560

Highly Integrated Current Mode PWM Controller with Latch

TURES

◆ Latch Plug-off Protection with External

Triggering

◆ Built-in Soft Start Function

◆ Very Low Startup Current

◆ Frequency Reduction and Burst Mode Control

for Energy Saving

◆ Built-in Frequency Shuffling

◆ Programmable Switching Frequency

◆ Built-in Synchronous Slope Compensation

◆ Cycle-by-Cycle Current Limiting

◆ All Pins Floating Protection

◆ High Voltage CMOS Process with Excellent

ESD Protection

◆ Current Mode Control

◆ Built-in Leading Edge Blanking (LEB)

◆ Constant Power Limiting

◆ Audio Noise Free Operation

◆ VDD OVP & Clamp

◆ VDD Under Voltage Lockout (UVLO)

APPLICATIONS

Offline AC/DC Flyback Converter for

◆ AC/DC Power Adaptors

◆ Open-frame SMPS

◆ Print Power, Scanners, and Motor Drivers

GENERAL DESCRIPTION

SF1560 is a high performance, highly integrated

current mode PWM controller for medium to large

offline flyback converter applications.

In SF1560, the PWM switching is internally trimmed

to tight range. To improve EMI performance, the IC

integrates frequency shuffling function to reduce

conduction EMI emission of a power supply. The IC

also integrates Constant Power Limiting block to

achieve constant output power limit from 90VAC to

264VAC.

Under light load conditions, a green mode function

can continuously decrease the switching frequency.

Under zero-load conditions, the power supply enters

into burst mode and provides excellent efficiency

without audio noise generated. This green mode

function enables power supplies to meet international

power conservation requirements.

SF1560 integrates functions and protections of Under

Voltage Lockout (UVLO), VDD Over Voltage

Protection (OVP), Soft Start, External Programmable

Over Temperature Protection (OTP), Cycle-by-cycle

Current Limiting (OCP), Over Load Protection (OLP),

All Pins Floating Protection, RI Pin Short-to-GND

Protection, GATE Clamping, VDD Clamping, Leading

Edge Blanking (LEB).

In SF1560, the OTP and VDD OVP is Latch Plug-off

Protection. The other protection functions are auto-

recovery mode protection.

SF1560 is available in SOP-8 and DIP-8 packages.

TYPICAL APPLICATION

AC IN

EMI

Filter

DC Out

SF1560

1 GND

GATE 8

2 FB

3 VIN

4 RI

VDD 7

CS 6

RT 5

NTC

TL431

©SiFirst Technology

- 1 - SiFirst_DS_1560_brief

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