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AN3095 데이터시트(PDF) 12 Page - STMicroelectronics

부품명 AN3095
상세설명  The STEVAL-ISV002V2 demonstration board is the same
PDF  55 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN3095 데이터시트(HTML) 12 Page - STMicroelectronics

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DC-DC converter
AN3095
12/55
Doc ID 16555 Rev 3
Due to symmetry during the two halves of the switching period, current expressions and
current paths may be derived with similar considerations for the second half of the switching
period.
If d >1 the current in the leakage inductor may reach zero and there is a boundary between
CCM and DCM.
In DCM there are also three modes of operation, as shown in Figure 10.
●
Mode 1, interval t0-t1:
At t=t0 inductor current is zero. After t=t0 devices M1and M4 are turned on under zero
current and inductor current rises according to the following equation:
Equation 5
Figure 10.
Modulation and transformer current in DCM
●
Mode 2, interval t1-t2:
At t1 M6 turns off and M5 turns on with zero current. Inductor current expression is given by:
Equation 6
and reaches zero at t=t3.
●
Mode 3, t2-t3
Equation 7
The boundary between DCM and CCM depends on the phase-shift angle, input voltage,
output voltage and transformer turns ratio and is given by:
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