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FSD146MRBN Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Green-Mode Fairchild Power Switch (FPS™)
October 2011
FSD146MRBN
Green-Mode Fairchild Power Switch (FPS™)
Features
 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, Output-Short
Protection (OSP), and Under-Voltage Lockout
(UVLO) with Hysteresis
 Low Operating Current (0.4mA) in Burst Mode
 Internal Startup Circuit
 Internal High-Voltage SenseFET: 650V
 Built-in Soft-Start: 15ms
 Auto-Restart Mode
Description
The FSD146MRBN is an integrated Pulse Width
Modulation (PWM) controller and SenseFET 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 FSD146MRBN can reduce total cost, component
count, size, and weight; while simultaneously increasing
efficiency, productivity, and system reliability. This
device provides a basic platform that is well suited for
cost-effective design of a flyback converter.
Applications
 Power Supply for LCD Monitor, STB, and
DVD Combination
Ordering Information
Part
Number
Output Power Table(2)
Package
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
FSD146MRBN 8-DIP
-40°C ~
+125°C
1.50A 2.6
23W
35W
17W
26W FSFM260N
Notes:
1. Lead-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.
© 2011 Fairchild Semiconductor Corporation
FSD146MRBN • Rev. 1.0.0
www.fairchildsemi.com
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