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GaN versus Silicon Which, where, why, how



GaN transistors: are they ready to replace silicon FETs?

 

I would like to start a discussion regarding GaN transistors for power conversion applications. I picked three pairs of transistors based on the first set of parameters a designer will use to filter possible parts for a specific application: breakdown voltage and Rdson. I would like to see comments, particularly from real power supply designers regarding:

 - Which part would you choose and why?

 - How important is a lower Ciss in a real application from efficiency perspective.

 - Is it 125ºC maximum junction temperature OK or not?

 - Do you see gate driving requirements important in selecting silicon versus GaN parts?

 - Do you have a real-life, apples-to-apples comparison, GaN versus Silicon solution for the same final application?

 - Should we pick a different set of parts for GaN/Silicon comparison?

 

The comments should help both power supply designers and manufacturers of silicon and GaN transistors. Here are the contenders:

 

 

EPC1010

IPD320N20N

 

 

 

Vds [V]

200

200

Rdson [mOhm]

18

27

Id [A]@25ºC

12

34

Id [A] pulse

40

136

Tjmin [ºC]

-40

-55

Tjmax [ºC]

125

175

Ciss [pF]

440

1,770

Coss [pF]

310

135

Crss [pF]

30

4

Qg [nC]

7.5

22.0

Qgd [nC]

3.5

3.0

Cost 1k [$]

5.06

1.19

 

 

 

 

 

 

 

EPC1001

PSMN5R6-100PS

 

 

 

Vds [V]

100

100

Rdson [mOhm]

5.6

4.3

Id [A]@25ºC

25

100

Id [A] pulse

100

539

Tjmin [ºC]

-40

-55

Tjmax [ºC]

125

175

Ciss [pF]

800

8,061

Coss [pF]

450

561

Crss [pF]

40

330

Qg [nC]

10.5

141.0

Qgd [nC]

3.3

43.0

Cost 1k [$]

2.80

1.94

 

 

 

 

 

 

 

EPC1015

CSD17306Q5A

 

 

 

Vds [V]

40

30

Rdson [mOhm]

3.2

2.9

Id [A]@25ºC

33

24

Id [A] pulse

150

155

Tjmin [ºC]

-40

-55

Tjmax [ºC]

125

150

Ciss [pF]

1,100

1,670

Coss [pF]

575

890

Crss [pF]

60

56

Qg [nC]

11.6

11.8

Qgd [nC]

2.2

2.4

Cost 1k [$]

2.48

0.96

 

Post your comments on www.GoToPower.net or SMPS Power Supplies group on LinkedIn.

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