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

21

Setting the Dead Time Control Level

When using step up or Zeta or flyback DC/DC converter, it must prevent that

output transistor works at full-ON state (ON duty = 100%). To prevent this

situation, set the maximum duty of these channels. The dead time control circuit

is implemented as below. When the voltage at the DTC1 pin is higher than the

triangular wave voltage (CT1), the output transistor is turned on. The maximum

duty calculation formula assuming that triangular wave amplitude = 0.7V and

triangular wave minimum voltage = 1.1V.

Note 1 : The circuit is suitable at CH1 to CH5.

Note 2 : Shorting DTC and VREF to disable dead time control function.

Using CH4 Inv Amp.

When not using the CH4 INV Amp., connect the INA4 and OUTA4 each other.

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Duty