Data Sheet

17

Rev. 1.0, 2008-09-30

TLE4675

Reset Function

Reset Reaction Time

In case the output voltage of the regulator drops below the output undervoltage lower reset threshold

V

delay capacitor CD is discharged rapidly. Once the delay capacitor’s voltage has reached the lower delay

switching threshold

V

Additionally to the delay capacitor discharge time

t

time

t

with

•

t

•

t

•

t

typical performance graphs.

Reset Output Pull-Up Resistor

R

The Reset Output RO is an open collector output requiring an external pull-up resistor to a voltage

V

Item 7.2.7 a minimum value for the external resistor

R

For applications, where the external pull-up resistor

R

V

Item 7.2.6:

:

with

•

R

•

V

•

V

Please be aware, that

V

Reset Output “RO” Low for

V

In case of an undervoltage reset condition reset output “RO” is held “low” for

V

is 0 V. This is achieved by supplying the reset circuit from the output capacitor.

+

=

–

,

----------------------------------

=