TLS820F0

Block Description and Electrical Characteristics

Data Sheet

21

Rev. 1.1, 2015-07-27

5.7

Reset

The TLS820F0’s output voltage is supervised by the Reset feature, including Undervoltage Reset, delayed Reset

at Power-On and an adjustable Reset Threshold.

The Undervoltage Reset function sets the pin RO to LOW, in case

V

Threshold

V

When the regulator is powered on, the pin RO is held at LOW for the duration of the Power-On Reset Delay Time

t

Figure 6

Block Diagram Reset Circuit

Reset Delay Time

The pin DT1 is used to set the desired Reset Delay Time

t

timing according to Table 8.

Power-On Reset Delay Time

up. This delay time is the time period from exceeding the upper reset switching threshold

V

released by switching the reset output “RO” from “LOW” to “HIGH”.

Undervoltage Reset Delay Time

considers an output undervoltage event where the output voltage

V

Reset Blanking Time

The reset blanking time

t

Table 8

Reset DelayTime Selection

DT1 connected to

t

rd

GND

16.5 ms

Q

8.5 ms

GND

Q

I

OR

Supply

RO

RADJ

Control

Reset

C

Q

VDD

Micro-

Controller

GND

I

RO

I

RADJ

Timer

S

R

Q

OR

Reference

DT1