Pin N.

Name

Function

A voltage divider must be connected among auxiliary winding, ZCD and GND. A negative-going edge

across the pin triggers GAN turn-on.

During GAN's on-time, the current sourced by the pin is monitored to get an image of the input voltage to

the converter, used for feed-forward compensation.

During GAN's off-time, a voltage exceeding the OVP threshold shuts the IC down reducing the device

consumption. This function is strobed and digitally filtered for high noise immunity.

12

VDD

Controller supply. An electrolytic capacitor, connected between this pin and GND, is initially charged by

the internal HV start-up generator.

A 100 nF ceramic cap between VDD and GND, as close as possible to the IC, might be required to reject

high frequency disturbances from internal circuitries.

13

DRV

GaN driver section supply. An internal voltage regulator tightly sets the driving voltage for GaN to 6 V to

obtain best performance.

A low ESR/ESL 1 µF ceramic capacitor placed between this pin and GND is required.

15,16

DRAIN

Drain pin of the GAN switch

EP

EP

Exposed Pad. This pin is mechanically connected to the controller die pad of the frame. In order to

improve noise immunity it must be connected to GND.

VIPERGAN50

Pin connections and function

DS13888 - Rev 2

page 3/37