TDA3608 datasheet(13/20 Pages) PHILIPS

13 / 20 page

1997 Aug 14

Philips Semiconductors

Preliminary speciﬁcation

Multiple voltage regulator with switch

TDA3608Q

TEST AND APPLICATION INFORMATION

Test information

handbook, full pagewidth

MGK605

regulator 2

output

regulator 1

output

enable input power switch

enable input regulator 3

back-up

reset delay

capacitor

reset

output

µF

220 nF

2.2

Ω

220 nF

µF

hold output

1 k

Ω

10 k

Ω

10 k

Ω

1 k

Ω

1 k

Ω

5 V

10 V

regulator 3

output

µF

220 nF

47 nF

RL(sw)

RL(REG2)

1 k

Ω

RL(REG1)

1 k

Ω

RL(REG3)

power switch output

TDA3608Q

GND

supply voltage

VENSW

VEN3

enable input regulator 1

VEN1

Vbu

(1)

Fig.6 Test circuit.

(1) Capacitor not required for stability.

Application information

NOISE

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 into a current noise by

means of the output capacitors). Table 1 shows the noise

figure with the corresponding output capacitor for each

regulator. The noise is minimal when a high frequency

capacitor of 220 nF in parallel with an electrolytic capacitor

of 100

µF is connected directly to pins VP and GND.

Table 1

Noise ﬁgures

Note

1. Measured at a bandwidth of 200 kHz.

REGULATOR

NOISE FIGURE(1)

CO =10 µFCO =47 µFCO = 100 µF

225

µV

150

µV

135

µV

225

µV

150

µV

135

µV

255

µV

200

µV

180

µV

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