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TDA3605Q

Multiple voltage regulator with switch

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator with switch

Preliminary specification

TDA3605Q

When an electrolytic capacitor is used the temperature

behaviour of this output capacitor can cause oscillations at

cold temperature.

The following two examples explain how an output

capacitor value is selected.

Example 2

Regulator 2 is made stable with a 10 µF electrolytic

capacitor (ESR = 3 Ω). At −30 °C the capacitor value is

decreased to 3 µF and the ESR is increased to 23.1 Ω.

The regulator will be unstable at −30 °C (see Fig.7).

Example 1

Regulator 1 is made stable 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.

Solution

Use a tantalum capacitor of 10 µF or a large electrolytic

capacitor. The use of tantalum capacitors is recommended

to avoid problems with stability at cold temperatures.

handbook, halfpage

14

R 12

(Ω)

10

8

6

4

2

0

0.22

maximum ESR

MBK099

stable region

minimum ESR

1

10

100

C (µF)

handbook, halfpage

4

R

(Ω) 3

2

maximum ESR

MBK100

stable region

1

minimum ESR

0

1

10

100

C (µF)

Fig.7 Curve for selecting the value of output

capacitor for regulator 2.

Fig.8 Curve for selecting the value of output

capacitor for regulators 1 and 3.

1997 Jul 09

13

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