FAN6863RTY Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – Highly Integrated Green-Mode PWM Controller

May 2011
FAN6863
Highly Integrated Green-Mode PWM Controller
Features
 Low Standby Power: Under 0.1W
 Low Startup Current: 8µA
 Low Operating Current at Green Mode: 600µA
 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 (FAN6863L) for OVP, OTP
 SENSE Pin Short-Circuit Protection (SSCP)
 Fixed PWM Frequency (65KHz) with Frequency
Hopping
 Feedback Open-Loop Protection: 60ms Delay
 GATE Output Maximum Voltage Clamp: 13.5V
 Soft-Start Time: 5ms
 Soft Driving for EMI Improvement
 Full Range Frequency Hopping
 Internal OTP Sensor with Hysteresis
 GATE Driving Capability: 400mA
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, FAN6863 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 FAN6863 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 provides
proprietary sawtooth compensation for constant output
power limit over universal AC input range. The gate
output is clamped at 13.5V to protect the external
MOSFET from over-voltage damage.
Other protection functions include SENSE pin Short-
Circuit Protection (SSCP), 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 shown in Table 1.
Table 1. Protection Type
Part
Number
FAN6863
FAN6863L
FAN6863R
OVP
Latch
Latch
A/R
OLP
A/R
Latch
A/R
OTP /
OTP2
Latch
Latch
A/R
SSCP
A/R
A/R
A/R
Ordering Information
Part Number
FAN6863TY
FAN6863LTY
FAN6863RTY
Operating
Temperature Range
Package
-40 to +105°C
6-Lead, SuperSOT™-6, JEDEC M0-193,
1.6mm Wide
© 2011 Fairchild Semiconductor Corporation
FAN6863 • Rev. 1.0.1
Packing Method
Tape & Reel
www.fairchildsemi.com