Onsemi FSL538HPG | Demoboard EVBUM2650/D

Description

This user manual provides elementary information about a Non−isolated dual output flyback with FSL538HPG, it performs high efficiency and smaller than 50 mW no−load power consumption. FSL538HPG 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 built−in error amplifier for feedback connection directly and self−protection circuitry. This design focuses mainly on the FSL538HPG current−mode PWM controller. Please refer to FSL538HPG’s materials to get more information about this device.The FSL538HPG 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 JunctionMOSFET with SENSEFET Technology
• Built−in HV Current Source for Start−up
• Peak−Current−Mode Control with SlopeCompensation
• Line Compensation for Maximum Over−Power Limiting
• Advanced Soft−start for Low ElectricalStress
• 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 TriggeringLevel: LOVP

Typical applications

More information

• Datasheet
• IC product information