FAN6862_10 Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Highly Integrated Green-Mode PWM Controller

January 2010
FAN6862
Highly Integrated Green-Mode PWM Controller
Features
ƒ Low Startup Current: 8µA
ƒ Low Operating Current in Green Mode: 3mA
ƒ Peak-Current Mode Operation with Cycle-by-Cycle
Current Limiting
ƒ PWM Frequency Continuously Decreasing with
Burst Mode at Light Loads
ƒ VDD Over-Voltage Protection (OVP)
ƒ Constant Output Power Limit (Full AC Input Range)
ƒ Internal Latch Circuit for OVP, OTP
ƒ Fixed PWM Frequency (65KHz) with Frequency
Hopping
ƒ Feedback Open-Loop Protection with 56ms Delay
ƒ Soft Start Time: 4ms
ƒ 400mA Driving Capability
Applications
General-purpose switch-mode power supplies and
flyback power converters, including:
ƒ Power Adapters
ƒ Open-Frame SMPS
ƒ SMPS with Surge-Current Output, such as for
Printers, Scanners, and Motor Drivers
Description
A highly integrated PWM controller, FAN6862 provides
several features to enhance the performance of flyback
converters. To minimize standby power consumption, a
proprietary green-mode function provides off-time
modulation to continuously decrease the switching
frequency under light-load conditions. Under zero-load
conditions, the power supply enters burst-mode, which
completely shuts off PWM output. Output restarts just
before the supply voltage drops below the UVLO lower
limit. This green-mode function enables power supplies
to meet international power conservation requirements.
The FAN6862 is designed for SMPS and integrates a
frequency-hopping function that helps reduce EMI
emission of a power supply with minimum line filters.
The built-in synchronized slope compensation is
proprietary sawtooth compensation for constant output
power limit over universal AC input range. The gate
output is clamped at 18V to protect the external
MOSFET from over-voltage damage.
Other protection functions include VDD over-voltage
protection and over-temperature protection. For over-
temperature protection, an external NTC thermistor can
be applied to sense the ambient temperature. When
VDD OVP or OTP is activated, an internal latch circuit
latches off the controller.
Part Number
FAN6862TY
FAN6862NY
OVP
Latch
Latch
OTP
Latch
Latch
OLP
Auto Restart
Auto Restart
Ordering Information
Part Number
FAN6862TY
FAN6862NY
Operating
Temperature Range
-40 to +105°C
-40 to +105°C
Eco Status
Package
Green
Green
6-Pin SSOT-6
8-Pin Dual In-Line Package (DIP)
Packing
Method
Tape & Reel
Tube
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FAN6862 • Rev. 1.0.2
www.fairchildsemi.com