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FSBH0270 View Datasheet(PDF) - Fairchild Semiconductor

Part NameFSBH0270 Fairchild
Fairchild Semiconductor Fairchild
DescriptionGreen Mode Fairchild Power Switch (FPS™)
'FSBH0270' PDF : 16 Pages
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April 2010
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370
Green Mode Fairchild Power Switch (FPS™)
ƒ Brownout Protection with Hysteresis
ƒ Built-In 5ms Soft-Start Function
ƒ Internal Avalanche-Rugged 700V SenseFET
ƒ No Acoustic Noise During Light-Load Operation
ƒ High-Voltage Startup
ƒ Linearly Decreasing PWM Frequency to 18KHz
ƒ Peak-Current-Mode Control
ƒ Cycle-by-Cycle Current Limiting
ƒ Leading-Edge Blanking (LEB)
ƒ Synchronized Slope Compensation
ƒ Internal Open-Loop Protection
ƒ VDD Under-Voltage Lockout (UVLO)
ƒ VDD Over-Voltage Protection (OVP)
ƒ Internal Auto-Restart Circuit (OVP, OTP)
ƒ Constant Power Limit (Full AC Input Range)
ƒ Internal OTP Sensor with Hysteresis
ƒ VIN Pin for Pull-HIGH Latch Function and Pull-
LOW Auto-Recovery Protection
General-purpose switch-mode power supplies and
flyback power converters, including:
ƒ Auxiliary Power Supply for PC and Server
ƒ SMPS for VCR, SVR, STB, DVD & DVCD Player,
Printer, Facsimile, and Scanner
ƒ Adapter for Camcorder
The highly integrated FSBH-series consists of an
integrated current-mode Pulse Width Modulator (PWM)
and an avalanche-rugged 700V SenseFET. It is
specifically designed for high-performance offline
Switch Mode Power Supplies (SMPS) with minimal
external components.
The integrated PWM controller features include a
proprietary green-mode function that provides off-time
modulation to linearly decrease the switching frequency
at light-load conditions to minimize standby power
consumption. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 18kHz. This
green-mode function enables the power supply to meet
international power conservation requirements. The
PWM controller is manufactured using the BiCMOS
process to further reduce power consumption. The
FSBH-series turns off some internal circuits to improve
power saving when VFB is lower than 1.6V, which allows
an operating current of only 2.5mA.
The FSBH-series has built-in synchronized slope
compensation to achieve stable peak-current-mode
control. The proprietary external line compensation
ensures constant output power limit over a wide AC
input voltage range, from 90VAC to 264VAC.
The FSBH-series provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures safety when an
open-loop or output short occurs. PWM output is
disabled until VDD drops below the VTH-OLP, then the
controller starts up again. As long as VDD exceeds 28V,
the internal OVP circuit is triggered.
Compared with a discrete MOSFET and controller or
RCC switching converter solution, the FSBH-series
reduces total component count, design size, and
weight; while increasing efficiency, productivity, and
system reliability. These devices provide a basic
platform that is well suited for the design of cost-
effective flyback converters, such as in PC auxiliary
power supplies.
© 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 • Rev. 1.0.3
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