TLE4263-2ES datasheet(18/22 Pages) INFINEON

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TLE4263-2ES

Application Information

Data Sheet

Rev. 1.0, 2008-04-21

with

•

CD: capacitance of the delay capacitor to be chosen

•

trd,new: desired power-on reset delay time

•

rd: power-on reset delay time specified in this datasheet

For a precise calculation also take the delay capacitor’s tolerance into consideration.

Reset Adjust Function

The undervoltage reset switching threshold can be adjusted according to the application’s needs by connecting

an external voltage divider (

ADJ1, RADJ2) at pin RADJ. For selecting the default threshold connect pin RADJ to

GND.

When dimensioning the voltage divider, take into consideration that there will be an additional current constantly

flowing through the resistors.

With a voltage divider connected, the reset switching threshold

RT,new is calculated as follows:

(1)

with

•

VRT,new: the desired new reset switching threshold

•

RADJ1, RADJ2: resistors of the external voltage divider

RADJ,th: reset adjust switching threshold given in “Reset Function” on Page 13

VRT new

RADJ 1

ADJ 2

RADJ 2

------------------------------------------ V

RADJ th

TLE4263-2ES Datasheet(PDF) 18 Page - Infineon Technologies AG