TDA3682ST データシートの表示（PDF） - Philips Electronics
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TDA3682ST Datasheet PDF : 20 Pages
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Philips Semiconductors
Multiple voltage regulator with
power switches
Product specification
TDA3682
Table 1 Enable control pin EN1
EN1
REGULATOR OUTPUT
REG1
L
off
H
on
Table 2 Enable control pin EN2
REGULATOR OUTPUTS
EN2
REG3
REG4
REG5
L
off
off
off
M
on
off
on
H
on
on
off
Table 3 Enable control pin EN3
POWER SWITCHES
EN3
SW1
SW2
L
off
off
M
off
on
H
on
on
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:
tdelay = Cbackup × RL × V-----P---2----–----V-V---R-R---EE---G-G---2-2----–----0----.-5--
Example: VP2 = 14.4 V, VREG2 = 5 V, RL = 1 kΩ 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.
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.
MGT170
Vo(REG)
I sc
I o(REG)
Im
Fig.3 Foldback current protection.
2002 Mar 11
6
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