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PDF ( 数据手册 , 数据表 ) AN-6961

零件编号 AN-6961
描述 Critical Conduction Mode PFC Controller
制造商 Fairchild Semiconductor
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AN-6961 数据手册, 描述, 功能
www.fairchildsemi.com
AN-6961
Critical Conduction Mode PFC Controller
Description
This application note describes a power factor correction
(PFC) circuit using the FAN6961. Both the features of this
controller, as well as the operation of the power factor
correction circuit, are presented in detail. Based on the
proposed design guideline, a design example with detailed
parameters demonstrates the performance of the controller.
Introduction
The FAN6961 PFC controller is an 8-pin Boundary Current
Mode (BCM) IC intended for controlling PFC pre-regulators.
The FAN6961 provides a controlled on-time to regulate the
output DC voltage and achieve natural power factor
correction. The maximum on-time of the switch is
programmable to ensure safe operation during AC
brownouts. An innovative multi-vector error amplifier is built
in to provide rapid transient response and precise output
voltage clamping. Once the output feedback loop is opened,
the output driver (GD) is disabled to provide protection of
the system. The start-up current is lower than 20µA and the
operating current has been reduced to 5mA. The supply
voltage can be operated up to 25V, maximizing application
flexibility. The FAN6961 also enables cycle-by-cycle current
limiting protection for the external power MOSFET.
Figure 1. Power Factor Correction Circuit
© 2009 Fairchild Semiconductor Corporation
Rev. 1.0.2 • 4/8/09
www.fairchildsemi.com







AN-6961 pdf, 数据表
AN-6961
APPLICATION NOTE
Figure 19.
Application Circuit Diagram (90W/19V)
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS
PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems which,
(a) are intended for surgical implant into the body, or (b)
support or sustain life, or (c) whose failure to perform when
properly used in accordance with instructions for use provided
in the labeling, can be reasonably expected to result in
significant injury to the user.
2. A critical component is any component of a life support device
or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
© 2009 Fairchild Semiconductor Corporation
Rev. 1.0.2 • 4/8/09
8
www.fairchildsemi.com














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