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TDA3617

Multiple voltage regulator

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator

Preliminary specification

TDA3617

Example 1

Regulators 1, 2 and 3 are stabilized with an electrolytic

output capacitor of 220 µF (ESR = 0.15 Ω). At −30 °C, the

capacitor value is decreased to 73 µF and the ESR is

increased to 1.1 Ω. The regulator will remain stable at

−30 °C.

Example 2

Regulators 1, 2 and 3 are stabilized with an electrolytic

output capacitor of 10 µF (ESR = 3.18 Ω). At −30 °C, the

capacitor value is decreased to 3.3 µF and the ESR is

increased to 23 Ω. The regulator will be instable at −30 °C.

Solution

Use a 47 nF HF capacitor in parallel with the output

electrolytic output capacitor. As can be seen from the

graph in Fig.7, the regulators will remain stable with an

output capacitor of 47 nF onwards. The electrolytic output

capacitor is only needed to minimize the output noise.

handbook, halfpa2g0e

R

(Ω)

15

10

5

0

0.1

MGK612

maximum ESR

stable region

1

10 C (µF) 100

Fig.7 Curve for selecting the value of output

capacitor for regulator 1.

1999 Jul 14

11

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