FAN6961 Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – Boundary Mode PFC Controller

January 2009
FAN6961
Boundary Mode PFC Controller
Features
ƒ Boundary Mode PFC Controller
ƒ Low Input Current THD
ƒ Controlled On-Time PWM
ƒ Zero-Current Detection
ƒ Cycle-by-Cycle Current Limiting
ƒ Leading-Edge Blanking instead of RC Filtering
ƒ Low Start-up Current: 10µA Typical
ƒ Low Operating Current: 4.5mA Typical
ƒ Feedback Open-Loop Protection
ƒ Programmable Maximum On-Time (MOT)
ƒ Output Over-Voltage Clamping Protection
ƒ Clamped Gate Output Voltage 16.5V
Applications
ƒ Electric Lamp Ballasts
ƒ AC-DC Switching Mode Power Converter
ƒ Open Frame Power Supplies and Power Adapters
ƒ Flyback Power Converters with ZCS / ZVS
Description
The FAN6961 is an 8-pin, boundary-mode, PFC
controller 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
external 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. A built-
in circuit disables the controller if the output feedback
loop is opened. The start-up current is lower than 20µA
and the operating current has been reduced to under
6mA. The supply voltage can be up to 25V, maximizing
application flexibility.
Ordering Information
Part
Number
FAN6961SZ
FAN6961DZ
FAN6961SY
Operating
Temperature Range
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
Package
8-Pin, Small Outline Package (SOP)
8-Pin, Dual In-line Package (DIP)
8-Pin, Small Outline Package (SOP)
Eco Status
RoHS
RoHS
Green
Packing
Method
Tape & Reel
Tube
Tape & Reel
For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2008 Fairchild Semiconductor Corporation
FAN6961 • Rev. 1.0.2
www.fairchildsemi.com