FSQ0370RNA_12 Datasheet, PDF (1/18 Pages) Fairchild Semiconductor – Green Mode Fairchild Power Switch (FPS™)

March 2012
FSQ0370RNA, FSQ0370RLA
Green Mode Fairchild Power Switch (FPS™)
Features
 Internal Avalanche Rugged 700V SenseFET
 Consumes Only 0.8W at 230V_AC & 0.5W Load with
Burst-Mode Operation
 Precision Fixed Operating Frequency: 100kHz
 Internal Startup Circuit and Built-in Soft-Start
 Pulse-by-Pulse Current Limiting, Auto-Restart Mode
 Over-Voltage Protection (OVP), Overload
Protection (OLP), Internal Thermal Shutdown
Function (TSD)
 Under-Voltage Lockout (UVLO)
 Low Operating Current: 3mA
 Adjustable Peak Current Limit
Applications
 Auxiliary Power Supply for PC and Server
 SMPS for VCR, SVR, STB, DVD, and DVCD Player
 Printer, Facsimile, and Scanner
 Adapter for Camcorder
Description
The FSQ0370 consists of an integrated Current Mode
Pulse Width Modulator (PWM) and an avalanche rugged
700V SenseFET. It is specifically designed for high-
performance offline Switched Mode Power Supplies
(SMPS) with minimal external components. The
integrated PWM controller features include: a fixed-
frequency generating oscillator, Under-Voltage Lockout
(UVLO) protection, Leading-Edge Blanking (LEB), an
optimized gate turn-on / turn-off driver, Thermal
Shutdown (TSD) protection, and temperature-
compensated precision current sources for loop
compensation and fault protection circuitry.
Compared to a discrete MOSFET and controller or RCC
switching converter solution, the FSQ0370 reduces total
component count, design size, and weight while
increasing efficiency, productivity, and system reliability.
These devices provide a basic platform that is well
suited for the design of cost-effective flyback converters,
such as in PC auxiliary power supplies.
Related Application Notes
 AN-4134 — Design Guidelines for Off-line Forward
Converters Using Fairchild Power Switch (FPS™)
 AN-4137 — Design Guidelines for Offline Flyback
Converters Using Fairchild Power Switch (FPS™)
 AN-4141 — Troubleshooting and Design Tips for
Fairchild Power Switch (FPS™) Flyback
Applications
 AN-4147 — Design Guidelines for RCD Snubber of
Flyback Converters
Ordering Information
Part Number
Package
Marking Code
FSQ0370RNA 8-Lead, Dual Inline Package (DIP)
FSQ0370RLA 8-Lead, LSOP
Q0370RA
BV_DSS
700V
f_OSC
100KHz
R_DS(ON)(MAX)
4.75Ω
© 2011 Fairchild Semiconductor Corporation
FSQ0370RNA / FSQ0370RLA • Rev. 1.0.2
www.fairchildsemi.com