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FSDM1265RB Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. FSDM1265RB
Description  Green Mode Fairchild Power Switch (FPS)
Download  20 Pages
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSDM1265RB Datasheet(HTML) 3 Page - Fairchild Semiconductor

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FSDM1265RB
3
Pin Definitions
Pin Configuration
Figure 3. Pin Configuration (Top View)
Pin Number
Pin Name
Pin Function Description
1Drain
This pin is the high voltage power Sense FET drain. It is designed to drive the
transformer directly.
2
GND
This pin is the control ground and the Sense FET source.
3Vcc
This pin is the positive supply voltage input. During startup, the power is supplied
by an internal high voltage current source that is connected to the Vstr pin.
When Vcc reaches 12V, the internal high voltage current source is disabled and
the power is supplied from the auxiliary transformer winding.
4Vfb
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. Once the pin reaches
6.0V, the overload protection is activated resulting in the shutdown of the FPSTM.
5N.C
6Vstr
This pin is connected directly to the high voltage DC link. At startup, the internal
high voltage current source supplies internal bias and charges the external ca-
pacitor that is connected to the Vcc pin. Once Vcc reaches 12V, the internal cur-
rent source is disabled.
6.Vstr
5.N.C.
4.Vfb
3.Vcc
2.GND
1.Drain
TO-220F-6L


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