Fairchild FSD176MRT Data Handbook
Summary
The FSD176MRT is a highly efficient Green-Mode PWM controller and SenseFET designed for modern offline Switch-Mode Power Supplies (SMPS). This integrated power switch minimizes size, component count, and standby power while boosting reliability through advanced features like Soft Burst Mode operation, random frequency fluctuation, and comprehensive protection circuits. The detailed manual provides technical specifications, application circuits, pin definitions, and operational guidance necessary for electrical engineers designing compact, reliable smart electronics such as LCD monitors and set-top boxes.
Page 1 Text Content
176M reen -M e F airch ild er S itch (F
September 2011
FSD176MRT Green-Mode Fairchild Power Switch (FPS™) Features Description
Advanced Soft Burst-Mode Operation for The FSD176MRT is an integrated Pulse Width Modulation (PWM) controller and Sense FET specifically
Low Standby Power and Low Audible Noise
designed for offline Switch-Mode Power Supplies
Random Frequency Fluctuation for Low EMI
(SMPS) with minimal external components. The PWM Pulse-by-Pulse Current Limit controller includes an integrated fixed-frequency oscillator, Under-Voltage Lockout (UVLO), Leading-
Various Protection Functions: Overload Protection Edge Blanking (LEB), optimized gate driver, internal (OLP), Over-Voltage Protection (OVP), Abnormal soft-start, temperature-compensated precise current Over-Current Protection (AOCP), Internal Thermal sources for loop compensation, and self-protection Shutdown (TSD) with Hysteresis, Output-Short circuitry. Compared with a discrete MOSFET and PWM Protection (OSP), and Under-Voltage Lockout (UVLO) controller solution, the FSD176MRT can reduce total with Hysteresis cost, component count, size, and weight; while
simultaneously increasing efficiency, productivity, and
Low Operating Current (0.4m A) in Burst Mode
system reliability. This device provides a basic platform
Internal Startup Circuit for cost-effective design of a flyback converter. Internal High-Voltage Sense FET: 650V Built-in Soft-Start: 15ms Auto-Restart Mode
Applications Power Supply for LCD Monitor, STB, and DVD Combination
Ordering Information
Output Power Table(2)
Operating
Current RDS(ON) 230VAC ±15%(3) 85~265VAC Replaces
Part Number Package Junction
Limit (Max.) Device
Temperature Open Open
Adapter(4) Adapter(4)
Frame(5) Frame(5)
TO-220
FSD176MRTUDTU 6-Lead(1) 3.50A 1.6Ω 80W 90W 48W 70W FSGM0765R
U-Forming TO-220
FSD176MRTLDTU 6-Lead(1) 3.50A 1.6Ω 80W 90W 48W 70W FSGM0765R
L-Forming
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 50C ambient temperature. 5. Maximum practical continuous power in an open-frame design at 50C ambient temperature.
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FSD176MRT • Rev. 1.0.0
Page Summary Contents For Fairchild FSD176MRT Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 17 |
| File Size | 618.37 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
What are the primary benefits of using FSD176MRT compared to discrete component solutions?
It reduces overall cost, component count, size, and weight while boosting efficiency and system reliability.
What critical protection functions does this controller integrate?
It includes OVP, OCP, UVLO, Overload Protection (OLP), and Active Over-Current Protection (AOCP).
What external components are necessary for stable operation of the Feedback (FB) pin?
For stable operation, a capacitor should be placed between the FB pin and GND.
What is the maximum allowable voltage rating for the Drain-to-Source (DS) path?
The absolute maximum voltage rated for the DS path is 650 V.