5.

Applications Information

The following sections describe the PD70211 application.

5.1

Peripheral Devices

An 82 nF to 100 nF/100 V capacitor must be placed between device VPP and VPN_IN pins, and located as close as

possible to the device.

A 58V TVS must be placed between device VPP and VPN_IN pins for protection against voltage transients. For

complete surge protection, see www.microchip.com/DS00003410B.

A 10 KΩ resistor must be placed on SUPP_S1 and SUPP_S2 lines between diode bridge and PD70211 device.

When WA_EN is used, a 100 nF to 1 uF/10V capacitor must be placed between WA_EN and VPN_IN pins close to

PD70211 device. Consult Microchip Technology for optimized recommendation.

When not used, WA_EN must be connected to VPN_IN pin.

5.2

Setting Switching Frequency

Any frequency between 100 kHz to 500 kHz can be set.

the synchronization breaks, the converter lapses back to the default value. When synchronizing, the frequency can

be increased to 1 MHz.

5.3

Setting Soft-Start

A capacitor is connected between SS pin and IC ground. The current charging of the capacitor is:

Therefore, charging a 0.1 µF ceramic cap on the SS pin from 0V to 1.2V takes:

This is the soft-start time in this case.

PD70211

Applications Information

Datasheet

DS00003672A-page 24