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FSQ0370RNA / FSQ0370RLA — 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
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,
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