TDA3603P datasheet(13/20 Pages) PHILIPS

13 / 20 page

1997 Aug 15

Philips Semiconductors

Product speciﬁcation

Multiple voltage regulator with switch

TDA3603

TEST AND APPLICATION INFORMATION

Fig.7 Test circuit (for SOT110-1).

(1) Capacitor not required for stability.

ndbook, full pagewidth

MBE232

regulator 2

regulator 1

enable input

ignition input

reset

output

µF

220 nF

µF

ignition

output

47 k

Ω

1 k

Ω

5 V

8.5 V

R L(sw)

1 k

Ω

R L(REG1)

1 k

Ω

R L(REG2)

TDA3603

ground

1 k

Ω

Ven

VI(ig)

(1)

Noise information

The noise at the output of the regulators depends on the

bandwidth of the regulators, which can be adjusted by the

output capacitors. Table 1 shows the noise figures.

Although stability is guaranteed when CL is higher than

µF (over temperature range) with tan (φ) = 1 in the

frequency range 1 to 10 kHz, however, for low noise, a

µF load capacitor is required. When electrolytic

capacitors are used, the capacitor value will decrease and

the ESR will increase much at low temperatures. To avoid

oscillation a normal capacitor of 220 nF can be placed in

parallel with this electrolytic capacitor.

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

the output capacitors). When a high frequency capacitor of

220 nF with an electrolytic capacitor of 100

µF in parallel is

placed directly over pins 1 and 6 (supply and ground) the

noise is minimized.

Table 1

Noise ﬁgures

Note

1. Bandwidth of 100 kHz.

REGULATOR

NOISE (

µV)(1)

OUTPUT

CAPACITOR (

µF)

180

100

120

100

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