MB39C308 datasheet(21/60 Pages) FUJITSU

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MB39C308

DS04-27261-6E

■ DESCRIPTION OF SOFT-START AND SOFT-STOP OPERATION

Soft-start function is featured to avoid inrush current when each channels is turned-on. When the CTL1, CTL2,

CTL34, CTL5 and CTL6 are set to “H” level, ramped-up voltage is fed on an inverting input of an error amplifier

of a channel. Start-time of the soft-start can be predefined and the start time is kept constant independent from

a load of the output of the channels. When the CTL1, CTL2, CTL34, CTL5 and CTL6 are set to “L” level, ramped-

down voltage is fed on an inverting input of an error amplifier of a channel then the output voltage goes low.

Stop-time of the Soft-stop can be predefined and the stop-time is kept constant independent from a load of the

output of the channel.

The time of both soft-start and soft-stop can be predefined with combination of the level on the SS1 and the

SS2 pins as shown in the “

• Soft-Start/Soft-Stop time (tson/tsoff) Setting Conditions”, and external capacitors

and resistors aren't required

• Soft-Start/Soft-Stop time (tson/tsoff) Setting Conditions

* : Accuracy : Typ

±15%

SS1 pin

SS2 pin

Soft-Start time

(tson) (Typ) *

Soft-Stop time

(tsoff) (Typ) *

Unit

Connecting to AGND pin

1.4

Connecting to AGND pin

Connecting to VREF pin

2.2

Connecting to AGND pin

Connecting to VB pin

2.9

Connecting to VREF pin

Connecting to AGND pin

3.5

Connecting to VREF pin

4.1

Connecting to VREF pin

Connecting to VB pin

5.1

Connecting to VB pin

Connecting to AGND pin

5.9

Connecting to VB pin

Connecting to VREF pin

7.3

Connecting to VB pin

8.2

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