FAN6863R Fairchild Semiconductor, FAN6863R Datasheet - Page 3
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FAN6863R
Manufacturer Part Number
FAN6863R
Description
A highly integrated PWM controller, FAN6863 provides several features to enhance the performance of flyback converters
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN6863.pdf
(16 pages)
© 2011 Fairchild Semiconductor Corporation
FAN6863 • Rev. 1.0.1
Marking Information
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
SENSE Current Sense
Name
GATE
GND
VDD
FB
RT
Power Supply Power supply.
Driver Output The totem-pole output driver for driving the power MOSFET.
Temperature
Function
Feedback
Detection
Ground
Ground.
The FB pin provides the output voltage regulation signal. It provides feedback to
the internal PWM comparator, so the PWM comparator can control the duty
cycle. This pin also provides over-current protection. Once V
trigger level and last for a long time, the controller stops and restarts.
An external NTC thermistor is connected from this pin to GND pin. The
impedance of the NTC decreases at high temperatures. Once the voltage of the
RT pin drops below a threshold, PWM output is disabled.
This pin senses the voltage across a resistor. When the voltage reaches the
internal threshold, PWM output is disabled and this activates over-current
protection. This pin also provides current amplitude information for Current-
Mode control.
Figure 4. Pin Configuration
Figure 3. Top Mark
3
ABx:
TT:
_ _ _
Description
:
:
ABR: FAN6863TY
ABF: FAN6863RTY
ABG: FAN6863LTY
Wafer Lot Code
Year Code
Week Code
FB
is large than
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