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Fairchild Semiconductor Electronic Components Datasheet

FAN6861 Datasheet

Green-Mode PWM Controller

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May 2009
FAN6861
Low-Cost, Highly Integrated, Green-Mode PWM
Controller for Peak Power Management
Features
ƒ Low Startup Current: 15µA Maximum
ƒ Green-Mode and Burst-Mode Operation for Low
Standby Power Consumption
ƒ Internal Soft Start: 10ms
ƒ Frequency Hopping for EMI Reduction
ƒ Peak-Current Mode Control with Cycle-by-Cycle
Current Limiting
ƒ Constant Output Power Limit (Full AC Input Range)
ƒ Built-in Slope Compensation
ƒ Two-Level Over-Current Protection (OCP) with
Delayed Shutdown (780ms) for Peak Power
Management
ƒ Open-Loop / Over-Load Protection (OLP)
ƒ VDD Over-Voltage Protection (OVP)
ƒ Programmable Over-Temperature Protection (OTP)
www.DataShAeept4pUl.iccomations
ƒ Switched Mode Power Supply (SMPS) with Motor
Load; such as for printer, scanner, motor drivers,
etc.
ƒ AC/DC Adapters
ƒ Open-Frame SMPS
Description
Highly integrated PWM controller, FAN6861 is
optimized for applications with motor load; such as
printer and scanner, which inherently impose some kind
of overload condition on the power supply during
acceleration mode. The two-level OCP function allows
the SMPS to stably deliver peak power during the motor
acceleration mode without causing premature shutdown
and while protecting the SMPS from overload condition.
The green-mode and burst-mode functions with a low
operating current (2.2mA maximum in green mode)
maximize the light load efficiency so that the power
supply can meet most stringent standby power
regulations.
The frequency-hopping function helps reduce electro-
magnetic interference (EMI) of a power supply by
spreading the energy over a wider frequency range.
The constant power limit function; minimizes the
components stress in abnormal condition and helps
designer to optimize the power stage more easily.
Many protection functions such; as OCP, OLP, OVP
and OTP, are fully integrated into FAN6861, which
improves the SMPS reliability without increasing the
system cost.
Ordering Information
Part Number
FAN6861TY
Operating Temperature Range
-40 to +105°C
Eco Status
Green
Package
SSOT-6
Packing Method
Tape & Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN6861 • Rev. 1.0.1
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN6861 Datasheet

Green-Mode PWM Controller

No Preview Available !

Typical Application
Figure 1. Typical Application
Block Diagram
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VDD 5
OVP OLP
OCP
Auto
Recovery
Protection
25V
OVP
Latch-off
OTP Protection
Latch-Off release
4V
Internal
BIAS
OSC
Green
Mode
Controller
GND
1
S
Q
R
Soft
Driver
Vlimit ramp
(Include Soft-Start)
UVLO
17.5V/9.5V
FB
OCP
OCP
Delay
SENSE
0.5V
Slope
Compensation
3R
R
RT 3
IRT
1V
0.7V
OTP1
Debounce
OTP2
Debounce
OTP
OLP
OLP
Delay
VDD
Blanking
Circuit
5.2V
4.6V
6 GATE
4 SENSE
2 FB
Figure 2. Block Diagram
© 2009 Fairchild Semiconductor Corporation
FAN6861 • Rev. 1.0.1
2
www.fairchildsemi.com


Part Number FAN6861
Description Green-Mode PWM Controller
Maker Fairchild Semiconductor
Total Page 15 Pages
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