FAN6755UWMY Datasheet, PDF (4/17 Pages) Fairchild Semiconductor – mWSaver™ PWM Controller

Pin Configuration
SOP-7
VIN
1
7
HV
FB
2
SENSE 3
6
VDD
GND
4
5
GATE
Figure 4. Pin Configuration (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
7
Name
Description
Line-voltage detection. The line-voltage detection is used for brownout protection with
VIN
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.
FB
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.
SENSE
Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle
current limiting.
GND Ground
GATE The totem-pole output driver. Soft-driving waveform is implemented for improved EMI.
VDD
Power supply. The internal protection circuit disables PWM output as long as VDD exceeds the
OVP trigger point.
HV For startup, this pin is connected to the line input or bulk capacitor in series with resistors.
© 2009 Fairchild Semiconductor Corporation
FAN6755W / FAN6755UW • Rev. 1.0.7
4
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