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| TLE4291E Datasheet, PDF (18/28 Pages) Infineon Technologies AG – Low Drop Out Linear Voltage Regulator | |||
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TLE4291
Reset Function
Reset Adjust Function
The undervoltage reset switching threshold can be adjusted according to the applicationâs needs by connecting
an external voltage divider (RADJ1, RADJ2) at pin âRADJâ. For selecting the default threshold connect pin âRADJâ to
GND. The reset adjustment range is given in Item 8.2.5.
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 VRT,new is calculated as follows
VRT,lo,new = VRADJ,th à (RADJ,1 + RADJ,2) / RADJ,2
(3)
with
⢠VRT,lo,new: Desired undervoltage reset switching threshold.
⢠RADJ,1, RADJ,2: Resistors of the external voltage divider, see Figure 6.
⢠VRADJ,th: Reset adjust switching threshold given in Item 8.2.4.
Supply
I
Control
GND
OR
VRADJ ,th
Int.
Supply
S
R
BlockDiagram _ResetAdjust .vsd
ID ,ch
IDR , dsch
VDST
Q
RRO
RO
CQ
IRO
RADJ ,1
D
CD
RADJ
IRADJ
RADJ ,2
Figure 6 Block Diagram Reset Circuit
VDD
Reset
Micro-
Controller
GND
Data Sheet
18
Rev. 1.1, 2012-12-03
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