VIPER16LN datasheet(5/30 Pages) STMICROELECTRONICS

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VIPER16

Pin settings

Figure 3. Connection diagram (top view)

Note:

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

Table 3. Pin description

Pin N.

Name

Function

DIP-7

SO16

11-2

GND

Connected to the source of the internal power MOSFET and controller

ground reference.

-4

N.A.

Not available for user. This pin is mechanically connected to the

controller die pad of the frame. In order to improve the noise immunity,

is highly recommended connect it to GND (pin 1-2).

VDD

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

current of the external capacitor.

LIM

This pin allows setting the drain current limitation to a lower value

respect to IDlim, which is the default one. The limit can be reduced by

connecting an external resistor between this pin and GND. In case of

high electrical noise, a capacitor could be connected between this pin

and GND, the capacitor value must be lower than 470 nF in order to

not impact the functionality of the pin. The pin can be left open if

default drain current limitation, IDlim, is used.

Inverting input of the internal trans conductance error amplifier.

Connecting the converter output to this pin through a single resistor

results in an output voltage equal to the error amplifier reference

voltage (see VFB_REF on Table 8). An external resistors divider is

required for higher output voltages.

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