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FAN6753 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – Highly Integrated Green-Mode PWM Controller | |||
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July 2009
FAN6753
Highly Integrated Green-Mode PWM Controller
Features
 High-Voltage Startup
 Low Operating Current: 2.7mA
 Adaptive Decreasing PWM Frequency to 22KHz
 Built-in Full-Range Frequency Hopping to Reduce
EMI Emission
 Fixed PWM Frequency: 65KHz
 Peak-Current-Mode Control
 Cycle-by-Cycle Current Limiting
 Leading-Edge Blanking (LEB)
 Synchronized Slope Compensation
 Internal Auto-Recovery Open-Loop Protection
 GATE Output Maximum Voltage Clamp: 18V
 VDD Under-Voltage Lockout (UVLO)
 VDD Over-Voltage Protection (OVP),
Auto Recovery / Latch for Option
 Internal Auto-Recovery Sense Short-Circuit
Protection for Option
 Constant Power Limit (Full AC Input Range)
 Internal OTP Sensor with Hysteresis
 Built-in 5ms Soft-Start Function
 Built-in LATCH Pin Pull HIGH (> 5.2V)
Latch Function
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
 Power Adapters
 Open-Frame SMPS
Description
The highly integrated FAN6753 PWM controller
provides several features to enhance the performance
of flyback converters.
To minimize standby power consumption, a proprietary
adaptive green-mode function provides frequency
modulation at light-load conditions. To avoid acoustic-
noise problems, the minimum PWM frequency is set
above 22KHz. 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,
FAN6753 is manufactured using the BiCMOS process,
which allows an operating current of only 2.7mA.
FAN6753 integrates a full-range frequency-hopping
function internally that helps reduce EMI emission of a
power supply with minimum line filters. Its built-in
synchronized slope compensation achieves stable
peak-current-mode control. The proprietary internal line
compensation ensures constant output power limit over
a wide AC input voltage range, from 90VAC to 264VAC.
FAN6753 provides many protection functions. In
addition to cycle-by-cycle current limiting, the internal
open-loop protection circuit ensures 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 starts up again. As long as VDD
exceeds ~26V, the internal OVP circuit is triggered.
FAN6753 is available in an 8-pin SOP package.
Ordering Information
Part Number
FAN6753MY
Operating
Temperature Range
-40°C to +105°C
Eco Status
Package
Packing Method
Green
8-Lead, Small Outline Package Tape & Reel
For Fairchildâs definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN6753 ⢠Rev. 1.0.1
www.fairchildsemi.com
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