Description

This user manual provides elementary information about an isolated

flyback with FSL518APG, it performs high efficiency and smaller

than 50 mW no−load power consumption. FSL518APG is an

integrated pulse width modulation (PWM) and 800 V power switch

with SENSEFET®, it can help to save external MOSFET and sense

resistor, increase power density and reliability. This application is

targeting auxiliary power supply for white goods and industrial

equipment, such as refrigerator, E−metering or similar types of

equipment.

The PWM controller includes an integrated variable frequency

oscillator, Under−Voltage Lockout (UVLO), Leading Edge Blanking

(LEB), optimized gate driver, internal soft−start, and temperature−

compensated precise current source for loop compensation and

self−protection circuitry. This design focuses mainly on the

FSL518APG current−mode PWM controller. Please refer to

FSL518APG’s materials to get more information about this device.

The FSL518APG is a current−mode PWM controller, it can have

better response to handle dynamic operation. Controller combines line

detection and burst−mode adjustment in one pin. It’s easy to achieve

these functionalities just need voltage divider and one Zener diode.

Line detection includes brown−in, brown−out and line OVP,

burst−mode adjustment is for fine tune audible noise and light load

efficiency. Of course, it also provides frequency reduction with

loading decreasing for gaining more design margin to improve light

load efficiency.

Key Features

• Integrated Rugged 800 V Super Junction

MOSFET with SENSEFET Technology

• Built−in HV Current Source for Start−up

• Peak−Current−Mode Control with Slope

Compensation

• Line Compensation for Maximum

Over−Power Limiting

• Advanced Soft−start for Low Electrical

Stress

• Peak−Current−Mode Control with Built−in

Slope Compensation

• Pulse−by−pulse Current Limit

• Line Brown−in, Brown−out,

and Over−Voltage Protection (LOVP)

• Adjustable Burst−mode Operation

• Frequency Hopping for Better EMI

• Various Protections:

♦ Auto Restart Mode: Brown−out, OLP,

OVP, AOCP and TSD

♦ Recovery Immediately by Triggering

Level: LOVP

FSL518APG属于集成电路（IC） > AC DC 转换器，离线开关。安森美半导体公司制造生产的FSL518APGAC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。