TDA3617 Ver la hoja de datos (PDF) - Philips Electronics
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TDA3617 Datasheet PDF : 16 Pages
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Philips Semiconductors
Multiple voltage regulator
TEST AND APPLICATION INFORMATION
Test information
Preliminary specification
TDA3617
handbook, full pagewidth
VP
Ven2
Ven3
Ven1
C1 (1)
220 nF
VP
3
enable input regulator 2
9
enable input regulator 3
1
enable input regulator 1
2
TDA3617
8
GND
7
HOLD
regulator 2
6
regulator 3
5
regulator 1
4
5V
C2
47 µF
3.3 V
C3
47 µF
9V
C4
47 µF
MGL593
(1) Capacitor not required for stability.
Fig.6 Test circuit.
RL(REG2)
1 kΩ
RL(REG3)
1 kΩ
RL(REG1)
1 kΩ
Application information
NOISE
Table 1 Noise figures
REGULATOR
1
2
3
NOISE FIGURE (µV)(1)
Co = 10 µF Co = 47 µF Co = 100 µF
tbf
150
tbf
tbf
150
tbf
tbf
200
tbf
Note
1. Measured at a bandwidth of 200 kHz.
when a high frequency capacitor of 220 nF in parallel with
an electrolytic capacitor of 100 µF is connected directly to
pins 3 and 8 (supply and ground).
STABILITY
The regulators are stabilized with the externally connected
output capacitors. The value of the output capacitors can
be selected by referring to the graph illustrated in Fig.7.
When an electrolytic capacitor is used, its temperature
behaviour can cause oscillations at temperatures lower
than −20 °C. In this case, use a tantalum capacitor.
The two examples on the next page show how an output
capacitor value is selected.
The noise on the supply line depends on the value of the
supply capacitor and is caused by a current noise (output
noise of the regulators is translated to a current noise by
means of the output capacitors). The noise is minimum
1999 Jul 14
10
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