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TDA3607

Multiple voltage regulator with switch

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator with switch

Preliminary specification

TDA3607

Example 1

Regulator 1 is made stable with an electrolytic output

capacitor of 68 µF (ESR = 0.5 Ω), at −30 °C the capacitor

value is decreased to 22 µF and the ESR is increased to

3.5 Ω. The regulator will remain stable at −30 °C.

Solution

Use a tantalum capacitor of 10 µF or a large electrolytic

capacitor. The use tantalum capacitors is recommended to

avoid problems with stability at cold temperatures.

Example 2

Regulator 2 is made stable with a 10 µF electrolytic

capacitor (ESR = 3.3 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).

handbook, halfp5age

R

(Ω)

4

maximum ESR

3

2

stable region

1

minimum ESR

0.22

1

10

100

C (µF)

MGL138

Fig.6 Curve for selecting the value of output

capacitor for regulator 1.

handbook, halfpage5

R

(Ω)

4

maximum ESR

3

2

stable region

1

minimum ESR

0.22

1

10

100

C (µF)

MGL139

Fig.7 Curve for selecting the value of output

capacitor for regulators 2 and 3.

1997 May 05

10

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