TDA3615J データシートの表示（PDF） - Philips Electronics

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TDA3615J

Multiple voltage regulator

Philips Electronics 

Philips Semiconductors

Multiple voltage regulator

Product specification

TDA3615J

handbook, halfpage

100

ESR

(Ω)

75

50

25

0.022

maximum ESR

stable region

0.1

1

10

C (µF)

MGR105

handbook, halfpage

C1

1000 µF

Vbat

VI(ig)

15

VSW2 = 0 V

9

11 SW2

C2

TDA3615J

220 nF

battery

16 V (max)

17

GND

MGR106

Fig.7 Stability curve of regulator 3 (5 V logic).

Fig.8 Loss of ground test circuit.

LOSS OF GROUND PROTECTION

Two power switches (media and antenna) are protected

for loss of ground. The loss of ground situation is depicted

in Fig.8. The ground terminal of the battery is connected to

the output of the media switch. Two problems occur:

1. At first connection a high charge current will flow

through C1 to the ground terminal (pin 17) of the

TDA3615J and out of the switch output (pin 11).

The media and antenna switches are protected to limit

this current.

2. When the switch is enabled, a short-circuit current will

flow out of the power switch output (pin 11) because

the output of the switch is shortened below substrate

potential.

A special protection is built-in to avoid the media and

antenna switches from being damaged during a loss of

ground condition.

In practice, this condition can occur when the ground

terminal of the total application is connected to the switch

output due to a bad wiring.

CAPACITIVE LOADS ON POWER SWITCHES

Power switches can deliver a large current to the

connected loads. When a supply voltage ripple is applied,

large load currents will flow when capacitive loads are

used in parallel with normal loads.

When the output of a power switch is forced above VI(ig) an

internal protection is activated to switch off the switch as

long as the fault is present.

The display switch in particular is sensitive to capacitive

loads.

We therefore strongly advise:

• Use only a 47 nF output capacitor on the display switch

• Use a 10 µF capacitor on the outputs of the antenna and

media switch.

On the outputs of regulators 2 to 6 a capacitor of 47 nF can

be used; larger values are possible but not necessary to

guarantee stability; see Figs 4, 6 and 7.

2004 Jan 12

14

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