TDA3605Q datasheet(13/16 Pages) PHILIPS

13 / 16 page

1997 Jul 09

Philips Semiconductors

Preliminary speciﬁcation

Multiple voltage regulator with switch

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 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.

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).

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.

Fig.7

Curve for selecting the value of output

capacitor for regulator 2.

handbook, halfpage

0.22

110

C (

µF)

MBK099

stable region

maximum ESR

minimum ESR

100

(

Ω)

Fig.8

Curve for selecting the value of output

capacitor for regulators 1 and 3.

handbook, halfpage

110

C (

µF)

MBK100

stable region

maximum ESR

minimum ESR

100

(

Ω)

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