1000 V SenseFET Integrated Power Switch
Built-in Avalanche Rugged 1000 V SenseFET
Precise Fixed Operating Frequency: 50 kHz
VCC can be supplied from either bias-winding or self-
Soft Burst-Mode Operation Minimizing Audible Noise
Random Frequency Fluctuation for Low EMI
Pulse-by-Pulse Current Limit
Various Protection Functions: Overload Protection
(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD) with Hysteresis. Under-Voltage
Lockout (UVLO) and Line Over-Voltage Protection
(LOVP) with Hysteresis.
Built-in Internal Startup and Soft-Start Circuit
Fixed 1.6 s Restart Time for Safe Auto-Restart Mode
of All Protections
The FSL4110LR is an integrated pulse width
modulation (PWM) controller and 1000 V avalanche
rugged SenseFET specifically designed for high input
voltage offline Switching Mode Power Supplies (SMPS)
with minimal external components. VCC can be supplied
through integrated high-voltage power regulator without
auxiliary bias winding.
The integrated PWM controller includes a fixed-
frequency oscillator, Under-Voltage Lockout (UVLO),
Leading-Edge Blanking (LEB), optimized gate driver,
soft-start, temperature-compensated precise current
sources for loop-compensation, and variable protection
Compared with a discrete MOSFET and PWM controller
solution, the FSL4110LR reduces total cost, component
count, PCB size, and weight; while simultaneously
increasing efficiency, productivity, and system reliability.
This device provides a basic platform for cost-effective
design of a flyback converter.
SMPS for Electric Metering
Auxiliary Power Supply for 3-Phase Input Industrial
Part Number Package
Output Power Table(1)
45~460 VAC(2) 85~460 VAC(2)
-40°C ~ 125°C 0.52 A
1. The junction temperature can limit the maximum output power.
2. Maximum practical continuous power in an open-frame design at 50 C ambient temperatures.
3. Bias winding condition.
© 2014 Fairchild Semiconductor Corporation
FSL4110LR • Rev. 1.3