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FAN6793MY Folha de dados(PDF) 1 Page - Fairchild Semiconductor

Nome de Peças FAN6793MY
Descrição Electrónicos  Highly Integrated, Dual-PWM Combination Controller
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6793MY Folha de dados(HTML) 1 Page - Fairchild Semiconductor

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April 2009
© 2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6791 / FAN6793 • Rev. 1.0.2
FAN6791 / FAN6793
Highly Integrated, Dual-PWM Combination Controller
Features
High-Voltage Startup
Low Operating Current
Interleaved Stand-by PWM / Forward PWM Switching
Green Mode Stand-by PWM / Forward PWM
Linearly Decreasing Stand-by PWM Frequency to
20kHz
Remote On / Off
AC Brownout Protection
Forward PWM with Soft-Start
Frequency Hopping to Reduce EMI Emissions
Cycle-by-Cycle Current Limiting for Stand-by PWM /
Forward PWM
Leading-Edge Blanking for Stand-by PWM / Forward
PWM
Synchronized Slope Compensation for Stand-by
PWM / Forward PWM
GATE Output Maximum Voltage Clamp
VDD Over-Voltage Protection (OVP)
VDD Under-Voltage Lockout (UVLO)
Internal Open-Loop Protection for Stand-by PWM /
Forward PWM
Constant Power Limit for Stand-by PWM / Forward
PWM
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
PC-ATX Power Supplies
Description
The
highly
integrated
FAN6791/3
dual
PWM
combination controller provides several features to
enhance the performance of converters.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
linearly decrease the switching frequency at light-load
conditions. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 20KHz. This
green-mode function enables the power supply to meet
international power conservation requirements. With the
internal high-voltage startup circuitry, the power loss
due to bleeding resistors is also eliminated. To further
reduce
power
consumption,
FAN6791/3
is
manufactured using the CMOS process, which allows
an operating current of only 6mA.
FAN6791/3 integrates a frequency-jittering function
internally to reduce EMI emissions of a power supply
with minimum line filters. The built-in synchronized slope
compensation
achieves
stable
peak-current-mode
control. The proprietary internal line compensation
ensures constant output power limit.
FAN6791/3
provides
many
protection
functions,
including brownout protection, cycle-by-cycle current
limiting, and an internal open-loop protection circuit to
ensure safety should an open-loop or output short-
circuit failure occur. PWM output is disabled until VDD
drops below the UVLO lower limit when the controller
restarts. As long as VDD exceeds ~24.5V, the internal
OVP circuit is triggered.


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