FAN6862WLTY Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Highly Integrated Green-Mode PWM Controller

September 2012
FAN6862W
Highly Integrated Green-Mode PWM Controller
Features
 Low Standby Power: Under 0.1 W
 Low Startup Current: 8 µA
 Low Operating Current in Green Mode: 600 µA
 Peak-Current Mode Operation with Cycle-by-Cycle
Current Limiting
 PWM Frequency Continuously Decreasing with
Burst Mode at Light Loads
 V_DD Over-Voltage Protection (OVP)
 Constant Output Power Limit (Full AC Input Range)
 Internal Latch Circuit (FAN6862WL) for OVP, OTP
 Fixed PWM Frequency (65 KHz) with Frequency
Hopping
 Feedback Open-Loop Protection: 60 ms Delay
 GATE Output Maximum Voltage Clamp: 13.5V
 Soft-Start Time: 5 ms
 Soft Driving for EMI Improvement
 Full Range Frequency Hopping
 Internal OTP Sensor with Hysteresis
 Gate Driving Capability: 400 mA
Applications
General-purpose switched-mode power supplies and
flyback power converters, including:
 Power Adapters
 Open-Frame SMPS
 SMPS with Surge-Current Output, such as for
Printers, Scanners, Motor Drivers
Description
A highly integrated PWM controller, FAN6862W
provides several features to enhance the performance
of flyback converters. To minimize standby power
consumption, a proprietary Green Mode 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. Green Mode enables power supplies to meet
international power conservation requirements.
The FAN6862W is designed for SMPS and integrates a
frequency-hopping function that helps to reduce EMI
emission of a power supply with minimum line filters. To
compensate the power limit variation over universal
input range, a bias current limit (V_LIMIT) adaptively keeps
the power limit substantially constant. The gate output is
clamped at 13.5 V to protect the external MOSFET from
over-voltage damage.
Other protection functions include V_DD Over-Voltage
Protection (OVP), and Over-Temperature Protection
(OTP). For OTP, an external NTC thermistor can be
applied to sense the ambient temperature. When V_DD
OVP or OTP is activated, an internal latch circuit latches
off the controller. Protection types are shown in Table 1.
Table 1. Protection Type
Part Number
FAN6862W
FAN6862WL
FAN6862WR
OVP
Latch
Latch
A/R
OLP
A/R
Latch
A/R
OTP / OTP2
Latch
Latch
A/R
Ordering Information
Part Number
FAN6862WTY
FAN6862WLTY
FAN6862WRTY
Operating
Temperature
Range
Package
Packing
Method
-40 to +105°C 6-Lead, SOT23, JEDEC MO-178 Variation AB, 1.6 mm Wide Tape & Reel
© 2012 Fairchild Semiconductor Corporation
FAN6862W • Rev. 1.0.0
www.fairchildsemi.com