DC to DC Synchronous Converter Design

Abdus Sattar, IXYS Corporation

IXAN0068

1

Modern power electronics products require small size and lighter weight of power

electronics parts. Filter inductor and capacitor sizes must be small. With the small filter,

the switching semiconductor devices must have small switching loss. And heat sink also

must be reduced. For the safe operation with the small heat sink, the switching

semiconductor devices must have small conduction loss. IXYS developed new generation

of Trench MOSFET (Trench2

The MOSFET will be well suited for high power applications of synchronous DC to DC

converters used in various systems. The MOSFET is rugged and has avalanche energy

capability.

Table 1: Few Examples of IXYS TrenchT2

Part Number

Vdss

(max)

(V)

Id @

Tc=25C

(A)

Rds(on)

@

Tj=25°C

(Ω)

Ciss

(pF)

Qg

(nC

)

trr @

Tj=

25°C

(ns)

R(th)JC

(°C/W)

Pd

(W)

(mJ)

Package

Type

IXTA220N04T2 

40

220

0.0035

6500

112

45

0.42

360  600 

TO‐263 

IXTP220N04T2 

40

220

0.0035

6500

112

45

0.42

360  600 

TO‐220 

IXTA90N055T2 

55

90

0.0084

2670

42

37

1.0

150  300 

TO‐263 

IXTP90N055T2

55

90

0.0084

2670

42

37

1.0

150  300 

TO‐220 

IXTA110N055T2

55

110

0.0066

3060

57

38

0.82

180  400 

TO‐263 

IXTP110N055T2

55

110

0.0066

3060

57

38

0.82

180  400 

TO‐220 

IXTA200N055T2

55

200

0.0042

6800

109

49

0.42

360  600 

TO‐263 

IXTP200N055T2

55

200

0.0042

6800

109

49

0.42

360  600 

TO‐220 

IXTA70N075T2

75

70

0.012

2580

46

48

1.0

150  300 

TO‐263 

IXTP70N075T2

75

70

0.012

2580

46

48

1.0

150  300 

TO‐220 

IXTA90N075T2

75

90

0.010

3100

54

50

0.82

180  400 

TO‐263 

IXTP90N075T2

75

90

0.010

3100

54

50

0.82

180  400 

TO‐220 

DC-to-DC Synchronous Converter Design:

Figure 1: Synchronous Buck Converter using IXYS TrenchT2