AN4242 datasheet(18/26 Pages) STMICROELECTRONICS

18 / 26 page

New 650 V JBS SiC diodes

AN4242

18/26

DocID024196 Rev 1

The characterization of the recovery charges for a given junction temperature versus the

forward current allows the determination of the no recovery charges area.

3.3.2

No recovery charge area

Figure 16 illustrates the no-recovery-charges area for a 6 A SiC 2nd generation diode in the

reference plan of forward current versus junction temperature. ST’s STPSC6H065D SiC G2

was designed to be used without any recovery charges up to 2 · IF(AV) at 150 °C or again

3· IF(AV) at 100°C. The 2 oscilloscope traces illustrate the switch-off behavior of the diodes

at IF = 12 A and IF = 18 A for Tj = 150 °C. At IF = 12 A, the behavior at 25°C and 150°C is

stable confirming the absence of recovery charges. At IF = 18 A, recovery charges start to

appear between 100 °C and 125 °C and become more significant at 150 °C. The same

characterization was made on a sample of diodes featuring another JBS technology

(corresponding to the dotted lines in Figure 15). This other JBS trade-off presents a larger

no-recovery-charge area but compromises on the forward voltage drop, that is higher at

high current levels.

Figure 16. Comparison of no recovery charge area between ST’s 6 A SiC 2nd

generation diode and another JBS technology

In a PFC, the peak current flowing through the diode can be estimated by:

Equation 25

For example, in an 800 W server application with a PFC working at Vin(min) = 90 V AC and

an efficiency of 90%, the peak current reaches 14 A (it’s the same for a 1600 W PFC

application working at 180 V AC). In this application the choice of a 6 A SiC G2 working with

a Tj around 125 °C is adapted.

STPSC6H065D

Other JBS

technology

No recovery

charge area

6 A SiC 2nd generation

diode working area

IF (A)

Tj (°C)

100

125

150

175

200

peakdiode

Ö2 · Pout

Vin(min)

rms

AN4242 Datasheet(PDF) 18 Page - STMicroelectronics

AN4242 Datasheet(HTML) 18 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Datasheet Download

Link URL