UCC28019P datasheet(41/48 Pages) TI

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Brown Out Protection

150

VINS

VINS _ V

150

0 1

150

VINS

AC( on )

AC ( off )

AC( on )

F _ BRIDGE

ENABLE _ th(max)

VINS

0 95

1 6

6 9

150

VINS

. V

. M

ENABLE _ th(max)

VINS

AC( on )

ENABLE _ th(max)

F _ BRIDGE

VINS

1 6

6 5

100

1 6

0 95

VINS

. V

. M

. V

UCC28019

SLUS755 – APRIL 2007

Select the top divider resistor into the VINS pin so as not to contribute excessive power loss. The extremely low

bias current into VINS means the value of RVINS1 could be hundreds of megaohms. For practical purposes, a

value less than 10 M

Ω is usually chosen. Assuming approximately 150 times the input bias current through the

resistor dividers will result in an RVINS1 that is less than 10 MΩ , so as to not contribute excessive noise, and still

maintain minimal power loss. The brown out protection will turn off the gate drive when the input falls below the

user programmable minimum voltage, VAC(off), and turn on when the input rises above VAC(on).

A 6.5-M resistance is chosen.

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