VIPER22-LED-EV データシートの表示（PDF） - STMicroelectronics

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VIPER22-LED-EV

Low power OFF-line SMPS primary switcher

STMicroelectronics 

Pin connections and function

VIPer22A-E, VIPer22ADIP-E, VIPer22AS-E

3

Pin connections and function

Figure 2. Pin connection

SOURCE 1

SOURCE 2

FB 3

VDD 4

8 DRAIN

7 DRAIN

6 DRAIN

5 DRAIN

SO-8

SOURCE 1

SOURCE 2

FB 3

VDD 4

8 DRAIN

7 DRAIN

6 DRAIN

5 DRAIN

DIP-8

Figure 3. Current and voltage conventions

IDD

ID

VDD

IFB

DRAIN

FB

CONTROL

VDD

VD

VFB

VIPer22A

SOURCE

Table 10. Pin function

Pin Name

Pin function

VDD

SOURCE

DRAIN

FB

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 14.5 V) at which the device starts switching and turns

off the start up current source.

- VDDoff: Voltage value (typically 8 V) at which the device stops switching and turns on

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 VDD capacitor.

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.

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Doc ID 12050 Rev 2

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