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SC3503

Fast Turn-Off Synchronous Rectifier Controller

SC3503SC3503

SC3503

SC3503 is a smart secondary-side driver IC designed to drive N-Channel power MOSFET used as synchronous rectifiers in isolated flyback converters. The MOSFET can replace Schottky diode so the system can achieve higher efficiency and superior heat dissipation performance. The SR MOSFET is turned on when VDS falls below turn-on threshold, and turned off when VDS exceeds turn-off threshold. The SR conduction voltage drop is continuously monitored to minimize the conduction loss. The extremely fast turn-off comparator and driving circuitry ensures the safety of the SR MOSFET, even in current continuous mode (CCM) condition. The IC can work well in wide output voltage range, even in short circuit conditions. The patented turn on detection circuitry prevents SR turn on when Vds rings severely. The wide VDD range and gate driver technology make the controller ideal for wide output voltage range applications, such as adapters, chargers, USB Power Delivery (USB-PD), etc. This chip supports both high side rectification and low side rectification.
SC3503
SC3503 is a smart secondary-side driver IC designed to drive N-Channel power MOSFET used as synchronous rectifiers in isolated flyback converters. The MOSFET can replace Schottky diode so the system can achieve higher efficiency and superior heat dissipation performance. The SR MOSFET is turned on when VDS falls below turn-on threshold, and turned off when VDS exceeds turn-off threshold. The SR conduction voltage drop is continuously monitored to minimize the conduction loss. The extremely fast turn-off comparator and driving circuitry ensures the safety of the SR MOSFET, even in current continuous mode (CCM) condition. The IC can work well in wide output voltage range, even in short circuit conditions. The patented turn on detection circuitry prevents SR turn on when Vds rings severely. The wide VDD range and gate driver technology make the controller ideal for wide output voltage range applications, such as adapters, chargers, USB Power Delivery (USB-PD), etc. This chip supports both high side rectification and low side rectification.
Product Details
Design / Development
Technical Documentation
Applications

Product Details

Design / Development

Parameters
Value
EVM Model
SC3503SC2150P EVM
Key Part Number
SC3503
Power
33W
Supports a wide range of output voltages. VDD without external LDO power supply
Vout=3.3V~20V
SC3503SC2150P EVM

Technical Documentation

Parameter NameParameter Value
HV and VSEN Pin Rating120V
Maximum FrequencyUp to 1MHz
DRV Voltage8V/6V
DRV Sink Current4A
Quiescent Current105uA
Minimum Turn-on Time0.30~0.40~0.50(uS)
Parameter NameParameter Value
Turn-on Delay20nS
Turn-off Delay20nS
Turn-off Propagation10nS
Features高频 GaN
PackageSOT23-6
ModeCCM/QR/DCM
Parameter NameParameter Value
HV and VSEN Pin Rating120V
Maximum FrequencyUp to 1MHz
DRV Voltage8V/6V
DRV Sink Current4A
Quiescent Current105uA
Minimum Turn-on Time0.30~0.40~0.50(uS)
Turn-on Delay20nS
Turn-off Delay20nS
Turn-off Propagation10nS
Features高频 GaN
PackageSOT23-6
ModeCCM/QR/DCM