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VIPER22ADIP-E Datasheet(PDF) 6 Page - STMicroelectronics

Part No. VIPER22ADIP-E
Description  Low Power OFF-Line SMPS Primary Switcher
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER22ADIP-E Datasheet(HTML) 6 Page - STMicroelectronics

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Pin Connections and Function
VIPer22ADIP/ VIPer22AS - E
6/20
Rev1
3
Pin Connections and Function
Figure 1.
Pin connection
Figure 2.
Current and voltage conventions
Table 9.
Pin function
Pin Name
Pin 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.
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
DIP-8
I
DD
I
D
I
FB
V
DD
VFB
V
D
FB
VDD
DRAIN
SOURCE
CONTROL
VIPer22A


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