TLE4291E Infineon Technologies, TLE4291E Datasheet - Page 23

• Manufacturer Part Number: TLE4291E
• Manufacturer: Infineon Technologies

Specifications of TLE4291E

• Packages: PG-SSOP-14
• Regulator Type: single output
• Output Voltage: 5V
• Accuracy: 2.0 %
• Max. Output Current: 450mA
• Dropout Voltage: 250mV

Figure 9
Watchdog Timing
Positive edges at the watchdog input pin “WI” are expected within the watchdog trigger time frame
a low signal at pin “WO” is generated. If a watchdog low signal at pin “WO” is generated, it remains low for
All watchdog timings are defined by charging and discharging the capacitor
timing can be programmed by selecting
In case a watchdog trigger time period
capacitor’s value can be derived from the specified value given in
The watchdog output low time
The formula is valid for
Figure 10
Data Sheet
V
WO,low
C
t
t
WD,lo
WD,p
V
V
D
V
V
DW,hi
DW,lo
V
V
WI,hi
WI,lo
V
WO
= 100nF ×
WI
D
=
=
Test Pulses Watchdog Input WI
Timing Diagram Watchdog
t
t
WI,tr
V
V
WD,lo,100nF
V
WI,hi
WI,lo
WI
+
t
t
WD,lo
C
WI,tr
D
×
d
≥ 10nF. For precise timing calculations consider also the delay capacitor’s tolerance.
V
/
WI
C
t
D
/ d
t
WI,tr,100nF
WD,lo
t
/ 100nF
and the watchdog period
C
D
t
. For timing details see also
WI,tr
t
WI,p
No positive
different from the value for
V
WI
edge
23
t
t
WD,lo
t
WD,p
Item
then becomes:
t
WI,tr
outside spec
V
V
d
Figure
9.2.5:
V
WI,hi
WI,lo
V
WI
WI
/ d
t
C
C
10.
D
D
t
WD,lo
= 100nF is required, the delay
T
at pin “D”. Thus, the watchdog
WI,p
1 /
1/
f
WI
f
WI
T i mi n g Di a g ra m_ W a t ch d o g .vsd
Rev. 1.0, 2011-06-07
Watchdog Function
t
WI,p
t
t
WI,tr
TLE4291
, otherwise
t
t
t
t
WD,lo
(4)
(5)
(6)
.