AT1393/A/B/C

Preliminary Product Information

6-Channel DC-DC Converter IC for DSC

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

Fax: 886-3-563-0879

13

＊

Output block

A totem pole configuration is designed for the output block and can drive external

MOSFET or transistor.

2. Channel Control

The channels are turned on and turned off according to the voltage levels at the

CTL, CTL12, CTL3, CTL4, and CTL5 as described in the following table.

Voltage level at control (CTL) pin

Channel on/off status

CTL CTL1,2 CTL3 CTL4 CTL5

CH6

CH1,2

CH3

CH4

CH5

L

X

X

X

X

OFF (standby state)

LOFF

L

H

OFF

ON

LOFF

L

H

H

OFF

ON

ON

LOFF

L

H

OFF

ON

LOFF

L

H

H

H

OFF

ON

ON

ON

LOFF

L

H

OFF

ON

LOFF

L

H

H

OFF

ON

ON

LOFF

L

H

OFF

ON

LOFF

H

H

H

H

H

ON

ON

ON

ON

ON

X : Don’t care

3. Protective Functions

＊

Short circuit protection and timer latch

The comparator for short circuit detection in each channel detects the output

voltage level of the power converter.

When the output voltage falls below the

short detection level, there will be a constant bias current charging the external

capacitor C

reaches about 0.7V and the output transistor turned off consequently.

The

actuated protection can be reset by restarting the power source.