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TLE42754D 数据表(PDF) 15 Page - Infineon Technologies AG

部件名 TLE42754D
功能描述  Low Dropout Linear Fixed Voltage Regulator
Download  24 Pages
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制造商  INFINEON [Infineon Technologies AG]
网页  http://www.infineon.com
标志 INFINEON - Infineon Technologies AG

TLE42754D 数据表(HTML) 15 Page - Infineon Technologies AG

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Data Sheet
15
Rev. 1.0, 2008-05-29
TLE42754
Block Description and Electrical Characteristics
5.3
Reset Function
The reset function provides several features:
Output Undervoltage Reset:
An output undervoltage condition is indicated by setting the Reset Output RO to “low”. This signal might be used
to reset a microcontroller during low supply voltage.
Power-On Reset Delay Time:
The power-on reset delay time
t
rd allows a microcontoller and oscillator to start up. This delay time is the time frame
from exceeding the reset switching threshold
V
RT until the reset is released by switching the reset output “RO” from
“low” to “high”. The power-on reset delay time
t
rd is defined by an external delay capacitor CD connected to pin D
charged by the delay capacitor charge current
I
D,ch starting from VD =0V.
If the application needs a power-on reset delay time
t
rd different from the value given in Item 5.3.6, the delay
capacitor’s value can be derived from the specified values in Item 5.3.6 and the desired power-on delay time:
with
CD: capacitance of the delay capacitor to be chosen
trd,new: desired power-on reset delay time
t
rd: power-on reset delay time specified in this datasheet
For a precise calculation also take the delay capacitor’s tolerance into consideration.
Reset Reaction Time:
The reset reaction time avoids that short undervoltage spikes trigger an unwanted reset “low” signal. The reset
reaction rime
t
rr considers the internal reaction time trr,int and the discharge time trr,d defined by the external delay
capacitor
C
D (see typical performance graph for details). Hence, the total reset reaction time becomes:
with
trr: reset reaction time
trr,int: internal reset reaction time
t
rr,d: reset discharge
Reset Output Pull-Up Resistor
R
RO:
The Reset Output RO is an open collector output requiring an external pull-up resistor to a voltage
V
IO, e.g. VQ. In
Table “Electrical Characteristics Reset Function” on Page 18 a minimum value for the external resistor
R
RO
is given for the case it is connected to
V
Q or to a voltage VIO < VQ. If the pull-up resistor shall be connected to a
voltage
V
IO > VQ, use the following formula:
CD
trd new
,
trd
---------------- 47nF
×
=
trr
trd int
,
trr d
,
+
=
RRO
5k
VQ
----------- V
IO
×
=


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