FAN6861 Fairchild Semiconductor, FAN6861 Datasheet - Page 3

• Manufacturer Part Number: FAN6861
• Description: A highly integrated PWM controller, FAN6861 provides several features to enhance the performance of flyback converters
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN6861 • Rev. 1.0.1
Marking Information
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
SENSE
Name Description
GATE
GND
VDD
RT
FB
Ground.
This pin is internally connected to the inverting input of the PWM comparator. The collector of
an opto-coupler is typically tied to this pin. For stable operation, a capacitor should be placed
between this pin and GND. If the voltage of this pin is higher than 4.6V for longer than 780ms,
the overload protection is triggered and PWM output is disabled.
This pin is for programmable over-temperature protection. An external NTC thermistor is
connected between this pin and GND pin. Once the voltage of this pin drops below a threshold
of 0.7V, PWM output is disabled.
This pin is for current sense. This pin senses the voltage across a resistor. The voltage of this
pin is compared with the feedback information determining the PWM duty cycle.
This pin is the positive supply voltage input.
The totem-pole output driver to drive the gate of power MOSFET. Soft driving waveform is
implemented to reduce EMI.
Figure 4. Pin Configuration
Figure 3. Top Mark
3
AAR: FAN6861
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