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IXTA110N055T2 Datasheet(PDF) 2 Page - IXYS Corporation

Part # IXTA110N055T2
Description  DC to DC Synchronous Converter Design
Download  11 Pages
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

IXTA110N055T2 Datasheet(HTML) 2 Page - IXYS Corporation

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DC to DC Synchronous Converter Design
Abdus Sattar, IXYS Corporation
IXAN0068
2
In Figure 1, the Q1 is called the high-side or control FET and Q2 is called the
low-side or sync FET applied in a step-down DC to DC synchronous converter
application. The ratio
Vin
Vo /
is controlled by the duty cycle of Q1. To improve the
efficiency, it’s desirable to have Q2 turned ON when Q1 is turned OFF. A simplified
switch state diagram is shown in Figure 2 [2]. It depicts the switching sequence as A-B-
C-B-A where the state B called “dead time” when both Q1 and Q2 are OFF and the
Schottky diode, D1 is ON to provide the freewheeling operation in the inductive load
circuit. It’s desirable to reduce the dead time to a minimum to improve the efficiency.
However, if the dead time is lower than the turn-on or turn-off times of Q1 and Q2, the
circuit may go into state D, the shoot-through state when both Q1 and Q2 are ON at the
same time causing a short-circuit in the input voltage source, Vin. The state D is
undesirable since it would destroy transistors Q1 and Q2.
Figure 2: Circuit Switch State Diagram [2]


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