TDA3682ST datasheet(6/20 Pages) PHILIPS

6 / 20 page

2002 Mar 11

Philips Semiconductors

Product speciﬁcation

Multiple voltage regulator with

power switches

TDA3682

Table 1

Enable control pin EN1

Table 2

Enable control pin EN2

Table 3

Enable control pin EN3

Protections

All output pins are fully protected against load dump and

short-circuit (foldback current protection); see Fig.3.

At load dump all regulator outputs will go low, except the

output of regulator 2 (BU5V).

The power switches can withstand ‘loss of ground’. This

means that the ground pin is disconnected and the switch

output is connected to ground.

Backup function

A backup function is present. This is realized by a switch

function which acts like a sort of ideal diode between

pins VP2 and STCP. The forward voltage of this ideal diode

depends on the current flowing through this diode. This

function makes it possible to supply regulator 2 (BU5V)

when no supply voltage is present on pin VP2. A special

application can be made using a backup function by

connecting a capacitor between pin STCP and ground.

When the supply voltage is present on pin VP2 this

capacitor will be charged to a level of VP2 − 0.3 V. This

charge can now be used to supply regulator 2 for a short

period of time when VP2 is switched to 0 V.

The delay time can be calculated using the formula:

Example: VP2 = 14.4 V, VREG2 = 5 V, RL =1kΩ and

Cbackup = 100 µF results in a delay time of 177 ms.

When an overvoltage condition occurs, the voltage on

pin STCP will be limited to approximately 18 V.

EN1

REGULATOR OUTPUT

REG1

off

Hon

EN2

REGULATOR OUTPUTS

REG3

REG4

REG5

off

EN3

POWER SWITCHES

SW1

SW2

off

Hon

MGT170

Vo(REG)

Isc

Io(REG)

Fig.3 Foldback current protection.

delay

backup

REG2

–

0.5

–

REG2

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