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Technical content
©SiFirst Technology - 1 - Confidential SiFirst_DS_7301_V1.0
FEATURES
◆ Proprietary Super- SRTM Technology ◆ Synchronous Rectification Controller ◆ Suited for High-Side and Low-Side of Flyback Converters in QR,DCM and CCM Operation ◆ Built In 1.25V Reference Voltage and Error Amplifier For Eliminating XX431(for Low-side) ◆ Programable Green Mode Control for Energy Saving at Light Load ◆ <1mA Quiescent Current for Energy Saving ◆ Primary-Side On Time Expansion and Shrink Protection ◆ VDD Range From 3.5V to 5.5V
APPLICATIONS
Offline AC/DC Flyback Converter for ◆ AC/DC Adaptors ◆ Open-frame SMPS GENERAL DESCRIPTION SF7301 is a secondary -side Synchronous Rectification (SR) controller to drive SR MOSFET for improved efficiency. SF7301 can be applied in Continuous or Discontinuous Conduction Mode(CCM and DCM) and Quasi -Resonant(QR) flyback converters based on a proprietary Super- SRTM Control for SR MOSFET. The IC builts in a high precision reference voltage （ 1.25V ） and an error amplifier to eliminating XX431 for cost saving. SF7301 integrates functions and protections of Under Voltage Lockout(UVLO),VDD Clamper, Primary-side MOSFET on time Expansion and Shrink Protections ,etc. SF7301 is available in SOP-8 package. TYPICAL APPLICATION Cout COMP GREEN VDD GD FB LPC GND SF7301 Vout=5V Low side SR application COMP AREF VDD GD FB LPC GND SF7301 Vout RH RL High side SR application Pin Configuration Sifirst Confidential
©SiFirst Technology - 2 - Confidential SiFirst_DS_7301_V1.0
Ordering Information
Part Number Top Mark Package Tape & Reel SF7301SG SF7301SG SOP8 Green Yes Marking Information SF7301SG Y WW YWW: Year&Week code Pin Description Pin Num Pin Name I/O Description 1 FB I Inverting input of the error amplifier. If not be used, this pin should be connected to GND
2 NC \\
3 LPC I Winding detection. This pin is used to detect the voltage on the winding and calculate the area of the winding signal during the on time period of the primary GATE.
4 GREEN I Program a voltage reference with a resistor form GREEN to GND, to
enable synchronous rectification MOSFET drive signal
5 GND P IC ground pin
6 GD O Totem-pole gate driver output to drive the external MOSFET. 7 VDD P IC power supply pin. 8 COMP O Output of the error amplifier. A feedback network is placed between this pin and PIN1. Sifirst Confidential