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FSL126MRT

Green-Mode Fairchild Power Switch (FPS™)

Fairchild Semiconductor 

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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