VIPER011XS datasheet(5/36 Pages) STMICROELECTRONICS

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VIPer01

Pin setting

DocID028751 Rev 1

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Pin setting

Figure 2: Connection diagram

Table 1: Pin description

SSOP10

Name

Function

GND

Ground and MOSFET source. Connection of source of the internal MOSFET

and the return of the bias current of the device. All groundings of bias

components must be tied to a trace going to this pin and kept separate from the

pulsed current return.

VCC

Controller supply. An external storage capacitor has to be connected across

this pin and GND. The pin, internally connected to the high voltage current

source, provides the VCC capacitor charging current at startup and during

steady-state operation, if the self-supply mode is selected. A small bypass

capacitor (0.1 μF typ.) in parallel, placed as close as possible to the IC, is also

recommended, for noise filtering purpose.

DIS

Disable. If its voltage exceeds the internal threshold VDIS_th (1.2 V typ.) for more

than tDEB time (1 ms, typ.), the PWM is disabled in auto-restart mode. An input

overvoltage protection can be built by connecting a voltage divider between DIS

pin and the rectified mains. In case of non-isolated topologies, with the same

principle an output overvoltage protection can be implemented. If the disable

function is not required, DIS pin must be soldered to GND, which excludes the

function.

Direct feedback. It is the inverting input of the internal transconductance E/A,

which is internally referenced to 1.2 V with respect to GND. In case of non-

isolated converter, the output voltage information is directly fed into the pin

through a voltage divider. In case of primary regulation, the FB voltage divider is

connected to the VCC. The E/A is disabled soldering FB to GND.

COMP

Compensation. It is the output of the internal E/A. A compensation network is

placed between this pin and GND to achieve stability and good dynamic

performance of the control loop. In case of secondary feedback, the internal E/A

must be disabled and the COMP directly driven by the optocoupler to control the

DRAIN peak current setpoint.

6 to 10

DRAIN

MOSFET drain. The internal high voltage current source sinks current from this

pin to charge the VCC capacitor at startup and during steady-state operation.

These pins are mechanically connected to the internal metal PAD of the

MOSFET in order to facilitate heat dissipation. On the PCB, copper area must

be placed under these pins in order to decrease the total junction-to-ambient

thermal resistance thus facilitating the power dissipation.

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