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TDA3616T Arkusz danych(PDF) 11 Page - NXP Semiconductors

Numer części TDA3616T
Szczegółowy opis  Multiple voltage regulator with battery detection
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA3616T Arkusz danych(HTML) 11 Page - NXP Semiconductors

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2000 Jan 14
11
Philips Semiconductors
Objective specification
Multiple voltage regulator with battery
detection
TDA3616
Application information
NOISE
The noise at the output of the regulator depends on the
bandwidth of the regulator, which can be adjusted by the
output capacitor CL. Table 1 shows the noise figures.
The noise on the supply line depends on the value of the
supply capacitor CP and is caused by a current noise (the
output noise of the regulator is translated into a current
noise by the output capacitor). When a high frequency
capacitor of 220 nF (with an electrolytic capacitor of
100
µF connected in parallel) is connected directly
between pins VP and GND the noise is minimized.
Table 1
Noise figures
Note
1. Measured at a bandwidth of 10 Hz to 100 kHz.
STABILITY
The regulator is stabilized by the output capacitor CL.
The value of the output capacitor can be selected using
the diagram shown in Fig.8. The following two examples
show the effects of the stabilization circuit using different
values for the output capacitor.
Remark: The behaviour of ESR as a function of the
temperature must be known.
Example 1
The regulator is stabilized using an electrolytic output
capacitor of 68
µF (ESR = 0.5 Ω). At Tamb = −40 °C the
capacitor value is decreased to 22
µF and the ESR is
increased to 3.5
Ω. The regulator will remain stable at a
temperature of Tamb = −40 °C.
Example 2
The regulator is stabilized using an electrolytic output
capacitor of 10
µF (ESR = 3.3 Ω). At Tamb = −40 °C the
capacitor value is decreased to 3
µF and the ESR is
increased to 23.1
Ω. The regulator will be unstable at a
temperature of Tamb = −40 °C. This can be solved by using
a tantalum capacitor of 10
µF.
IO (mA)
NOISE FIGURE (
µV)(1)
CL =10 µFCL =47 µFCL = 100 µF
0.5
58
50
45
50
250
200
180
handbook, full pagewidth
2
0
1
0.68
(1)
(2)
10
output capacitor (
µF)
MBK118
4
6
8
stable region
100
1000
ESR
(
Ω)
Fig.8 Curve for selecting the value of the output capacitor.
(1) Maximum Equivalent Series Resistance (ESR).
(2) Minimum ESR.


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