VIPER12A-E STMicroelectronics, VIPER12A-E Datasheet - Page 6

• Manufacturer Part Number: VIPER12A-E
• Description: Fixed frequency off line converter
• Manufacturer: STMicroelectronics

Specifications of VIPER12A-E

• Constant Current Output: 350 mA, 700 mA, 1.05 A (selectable)
• Input Voltage Range: 90 to 264 VAC 50/60 Hz

Pin connections and function
3
6/21
Pin connections and function
Figure 2.
Figure 3.
Table 9.
Pin Name
SOURCE
DRAIN
SOURCE
SOURCE
V
FB
DD
VDD
FB
Pin function
Pin connection
Current and voltage conventions
1
2
3
4
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 V
- V
off the start up current source.
- V
the start up current source.
Power MOSFET source and circuit ground reference.
Power MOSFET drain. Also used by the internal high voltage current source during
start up phase for charging the external V
Feedback input. The useful voltage range extends from 0 V to 1 V, 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.
DDon
DDoff
SO-8
: Voltage value (typically 14.5 V) at which the device starts switching and turns
: Voltage value (typically 8 V) at which the device stops switching and turns on
V
DD
I
DD
V
FB
8
7
6
5
I
FB
Doc ID 11977 Rev 2
DRAIN
DRAIN
DRAIN
DRAIN
VIPer12A
FB
VDD
CONTROL
Pin Function
DD
voltage and provides two thresholds:
DD
SOURCE
DRAIN
capacitor.
SOURCE
SOURCE
VDD
FB
1
2
3
4
I
D
V
D
DIP-8
VIPER12A-E
8
7
6
5
DRAIN
DRAIN
DRAIN
DRAIN