Silergy SQ38701/2/3 1700V SiC Integrated Flyback Switcher

The Silergy SQ38701/2/3 family is a highly integrated flyback switcher series featuring an embedded 1700V silicon carbide (SiC) power device in a compact SOP16 package. Designed for isolated power supplies ranging from approximately 13W to 40W, the devices support both primary-side regulation (PSR) and secondary-side regulation (SSR) operation, providing flexibility across a wide range of industrial and power conversion applications. 

Operating with peak current mode control and PWM/PFM switching, the SQ38701/2/3 family combines continuous conduction mode (CCM) and zero-voltage-switching quasi-resonant (ZVS-QR) operation to maximize efficiency while minimizing switching losses. The integrated 1700V high-voltage startup MOSFET reduces component count and BOM cost, while advanced protection features help ensure robust and reliable operation. 

Features 

• Integrated 1700V silicon carbide (SiC) power switch 

• Flyback switcher supporting approximately 13W, 25W, and 40W power levels 

• Configurable primary-side regulation (PSR) or secondary-side regulation (SSR) 

• Peak current mode control 

• PWM and PFM operation 

• Integrated 1700V high-voltage startup MOSFET 

• Continuous conduction mode (CCM) operation 

• Zero-voltage-switching quasi-resonant (ZVS-QR) operation 

• Pseudo fixed-frequency control strategy 

• Selectable 60kHz or 100kHz switching frequency 

• Peak power mode with switching frequencies up to 180kHz 

• Frequency foldback under reduced load conditions 

• Burst mode operation for improved light-load efficiency 

• Low-noise frequency modulation 

• Soft-start function 

• Brown-in/brown-out (BI/BO) protection 

• Overload protection (OLP) 

• VCC overvoltage protection (VCC OVP) 

• Output overvoltage protection (Output OVP) 

• Input overvoltage protection (Input OVP) 

• Short-circuit protection (SCP) 

• Secondary output diode SCP 

• Overtemperature protection (OTP) 

Applications 

• Three-phase power meter auxiliary power supplies 

• Air-conditioning auxiliary power supplies 

• Traction inverter auxiliary power supplies 

• Industrial power supplies 

• High-voltage isolated converters 

• Renewable energy systems 

• Power conversion and control systems