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VIPER12ADIP Datasheet(PDF) 2 Page - STMicroelectronics

Part No. VIPER12ADIP
Description  LOW POWER OFF LINE SMPS PRIMARY SWITCHER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER12ADIP Datasheet(HTML) 2 Page - STMicroelectronics

 
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VIPer12ADIP / VIPer12AS
2/15
PIN FUNCTION
CURRENT AND VOLTAGE CONVENTIONS
CONNECTION DIAGRAM
Name
Function
VDD
Power supply of the control circuits. Also provides a charging current during start up thanks to a high
voltage current source connected to the drain. For this purpose, an hysteresis comparator monitors the
VDD voltage and provides two thresholds:
- VDDon: Voltage value (typically 14.5V) at which the device starts switching and turns off the start up
current source.
- VDDoff: Voltage value (typically 8V) at which the device stops switching and turns on the start up current
source.
SOURCE
Power MOSFET source and circuit ground reference.
DRAIN
Power MOSFET drain. Also used by the internal high voltage current source during start up phase for
charging the external VDD capacitor.
FB
Feedback input. The useful voltage range extends from 0V to 1V, and defines the peak drain MOSFET
current. The current limitation, which corresponds to the maximum drain current, is obtained for a FB pin
shorted to the SOURCE pin.
I
DD
I
D
I
FB
V
DD
V
FB
V
D
FB
VDD
DRAIN
SOURCE
CONTROL
VIPer12A
1
2
3
4
DRAIN
DRAIN
DRAIN
DRAIN
8
7
6
5
DRAIN
DRAIN
DRAIN
DRAIN
1
2
3
4
8
7
6
5
FB
VDD
SOURCE
FB
VDD
SOURCE
SOURCE
SOURCE
SO-8
DIP8


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