FAN6755W Fairchild Semiconductor, FAN6755W Datasheet - Page 4

• Manufacturer Part Number: FAN6755W
• Description: This highly integrated PWM controller provides several features to enhance the performance of flyback converters
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN6755W / FAN6755UW • Rev. 1.0.5
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
7
SENSE
Name
GATE
GND
VDD
VIN
HV
FB
Line-voltage detection. The line-voltage detection is used for brownout protection with hysteresis.
Constant output power limit over universal AC input range is also achieved using this VIN pin. It
is suggested to add a low-pass filter to filter out line ripple on the bulk capacitor. Pulling VIN
HIGH also triggers auto-restart protection.
The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is
determined in response to the signal on this pin and the current-sense signal on the SENSE pin.
Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle
current limiting.
Ground
The totem-pole output driver. Soft-driving waveform is implemented for improved EMI.
Power supply. The internal protection circuit disables PWM output as long as V
OVP trigger point.
For startup, this pin is pulled HIGH to the line input or bulk capacitor via resistors.
Figure 4.
SENSE
GND
VIN
FB
Pin Configuration (Top View)
1
2
3
4
SOP-7
4
Description
7
6
5
GATE
VDD
HV
DD
exceeds the
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