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AN4242 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN4242
Description  New generation of 650 V SiC diodes
PDF  26 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4242 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN4242
2/26
DocID024196 Rev 1
Contents
1
Features of the SiC diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
Turn off behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.1
Comparison with Si bipolar diode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.2
Capacitive charge (QC) measurement . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2
Forward characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3
Other characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3.1
Low leakage current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3.2
“C” thermal coefficient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
Forward thermal runaway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
Thermal runaway risk in regular working mode . . . . . . . . . . . . . . . . . . . . . 8
2.2
Thermal runaway risk in transient phase . . . . . . . . . . . . . . . . . . . . . . . . . .11
3
New 650 V JBS SiC diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1
Device structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2
Comparison between first and second generation of SiC diodes . . . . . . . 13
3.2.1
Forward voltage comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.2
IFSM PSpice simulation: comparison between 1st and 2nd generation 15
3.2.3
IFSM datasheet comparison between SiC G2 and SiC G1 . . . . . . . . . . 16
3.3
JBS structure trade-off: current surge capability versus Qrr . . . . . . . . . . 17
3.3.1
Forward characteristics comparison between ST’S SiC 2nd generation
and other JBS designs 17
3.3.2
No recovery charge area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3.3
PSpice electro-thermal simulation result . . . . . . . . . . . . . . . . . . . . . . . . 19
4
Efficiency measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1
dI/dt optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2
Example of efficiency measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25



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