AT1386
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Setting the Dead Time Control Level
When using Boost, SEPIC, 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 DTC pin is higher than the
triangular wave voltage (CT, CTP, CTN), the output transistor is turned on. The
maximum duty calculation formula assuming that triangular wave amplitude =
0.5V and triangular wave minimum voltage = 0.3V.
Vd − 0.3
DutyMAX . = (
) ×100%
0.5
Note 1 : The circuit is suitable at CH1 to CH5.
Note 2 : Shorting DTC and VREG to disable dead time control function.
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
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
18
AIMTRON [ AIMTRON TECHNOLOGY ]
