TDA5220XT Infineon Technologies, TDA5220XT Datasheet - Page 29
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TDA5220XT
Manufacturer Part Number
TDA5220XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDA5220XT.pdf
(51 pages)
Specifications of TDA5220XT
Operating Temperature (min)
-40C
Operating Temperature (max)
125C
Operating Temperature Classification
Automotive
Product Depth (mm)
4.4mm
Product Length (mm)
9.7mm
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Lead Free Status / Rohs Status
Compliant
In order to reduce the turn-on time in the presence of large values of C a precharge
circuit was included in the TDA5220 as shown in the following figure.
Figure 12
This circuit charges the capacitor C13 with an inrush current I
duration of T
at the input of the data filter. This voltage is limited to 2.5V. As soon as these voltages
are equal or the duration T
as the sum of R4 and R5 is sufficiently large and thus can be neglected. T
calculated according to the following formula:
Preliminary Specification
2
is the time constant of the charging process of C18 which can be calculated as
20k
24
2
Principle of the precharge circuit
until the voltage U
U2
+3.1V
R4
R4+R5=600k
Uc>Us
C18
23
U
threshold
-
OTA
R5
2
Uc<Us
T
is exceeded the precharge circuit is disabled.
0 / 240uA
2
+2.4V
U2<2.4V : I=240uA
U2>2.4V : I=0
c
appearing on the capacitor is equal to the voltage U
2
I
load
ln
2
1
-
+
20
20
29
2
1
k
3
Uc
4 .
V
C13
V
R1
C
19
2
Us
2
Data Filter
1
6 .
load
of typically 220µA for a
ASK/FSK Switch
V 1.1, 2004-10-20
Applications
2
can then be
TDA 5220
s