FAN6753_11 Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – Highly Integrated Green-Mode PWM Controller

February 2011
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
 V_DD Under-Voltage Lockout (UVLO)
 V_DD 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 90V_AC to 264V_AC.
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 V_DD drops below the UVLO lower
limit, when the controller starts up again. As long as V_DD
exceeds ~26V, the internal OVP circuit is triggered.
Available in the 8-pin SOP package.
Ordering Information
Part Number
FAN6753MY
Operating
Temperature Range
-40C to +105C
Package
8-Lead, Small Outline Package
Packing Method
Tape & Reel
© 2009 Fairchild Semiconductor Corporation
FAN6753 • Rev. 1.0.3
www.fairchildsemi.com