VIPER28HD Ver la hoja de datos (PDF) - STMicroelectronics

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VIPER28HD

Off-line high voltage converters

STMicroelectronics 

Pin settings

3

Pin settings

Figure 3. Connection diagram (top view)

VIPER28

Note:

The copper area for heat dissipation has to be designed under the DRAIN pins.

Table 3. Pin description

Pin n.

Name

SDIP10 DIP-7 SO16N

Function

1

1

1...2 GND This pin represents the device ground and the source of the power section.

-

-

4

N.A.

Function: Not available for user. It can be connected to GND (pins 1-2) or left

not connected.

Supply voltage of the control section. This pin also provides the charging

2

2

5

VDD

current of the external capacitor during start-up time.

Control pin. The following functions can be selected:

1. current limit set point adjustment. The internal set default value of the cycle-

by-cycle current limit can be reduced by connecting to ground an external

3

3

6 CONT resistor.

2. output voltage monitoring. A voltage exceeding VOVP threshold (see Table 8

on page 7) shuts the IC down reducing the device consumption. This function

is strobed and digitally filtered for high noise immunity.

Control input for duty cycle control. Internal current generator provides bias

4

4

7

FB

current for loop regulation. A voltage below the threshold VFBbm activates the

burst-mode operation. A level close to the threshold VFBlin means that we are

approaching the cycle-by-cycle over-current set point.

5

5

8

EPT

This pin allows the connection of an external capacitor for the extra power

management. If the function is not used, the pin has to be connected to GND.

6...10

High voltage drain pin. The built-in high voltage switched start-up bias current

7,8 13...16 DRAIN is drawn from this pin too. Pins connected to the metal frame to facilitate heat

dissipation.

4/32

Doc ID 15028 Rev 5

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