Onsemi FSL518APG | Demoboard EVBUM2652/D

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 frequencyoscillator, 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.

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

Typical applications

• Consumer Electronics (Chargers, Set-top-boxes and TVs)
• Power Supplies for White Goods, Industrial Auxiliary Power Supply, E-metering SMPS

More information

• Datasheet
• IC product information