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FSL126MRT Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – Green-Mode Fairchild Power Switch (FPS™)
May 2012
FSL126MRT
Green-Mode Fairchild Power Switch (FPS™)
Features
 Internal Avalanched Rugged 650V SenseFET
 Advanced Soft Burst-Mode Operation for Low
Standby Power and Low 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 and Under-Voltage
Lockout (UVLO) with Hysteresis
 Low Operating Current(0.4mA) in Burst Mode
 Internal Startup Circuit
 Built-in Soft-Start: 15ms
 Auto-Restart Mode
Description
The FSL126MRT is an integrated Pulse Width
Modulation (PWM) controller and SenseFET specifically
designed for offline Switch-Mode Power Supplies
(SMPS) with minimal external components. The PWM
controller includes an integrated fixed-frequency
oscillator, Under-Voltage Lockout (UVLO), Leading-
Edge Blanking (LEB), optimized gate driver, internal
soft-start, temperature-compensated precise current
sources for loop compensation, and self-protection
circuitry. Compared with a discrete MOSFET and PWM
controller solution, the FSL126MRT can reduce total
cost, component count, size, and weight; while
simultaneously increasing efficiency, productivity, and
system reliability. This device provides a basic platform
suited for cost-effective design of a flyback converter.
Applications
 Power Supply for STB Home Appliances, and DVD
Combination
Ordering Information
Part
Number
Package
Output Power Table(2)
Operating
Junction
Temperature
Current
Limit
RDS(ON)
(Max.)
230VAC ± 15%(3)
Adapter(4)
Open
Frame(5)
85~265VAC
Adapter(4)
Open
Frame(5)
Replaces Device
TO-220F
FSL126MRT 6-Lead(1)
W-Forming
-40°C ~
+125°C
1.2A 6.2Ω
30W
40W
17W
25W KA5M0265RYDTU
Notes:
1. Pb-free package per JEDEC J-STD-020B.
2. The junction temperature can limit the maximum output power.
3. 230VAC or 100/115VAC with voltage doubler.
4. Typical continuous power in a non-ventilated enclosed adapter measured at 50°C ambient temperature.
5. Maximum practical continuous power in an open-frame design at 50°C ambient temperature.
© 2012 Fairchild Semiconductor Corporation
FSL126MRT • Rev. 1.0.0
www.fairchildsemi.com
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