AN443 datasheet(12/14 Pages) STMICROELECTRONICS

12 / 14 page

AN443 APPLICATION NOTE

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operating conditions (possibly by measurement and selection), it is possible to implement a resistor with

a value as high as possible.

Parallel capacitors also have to be reduced as much as possible with the knowledge the switching char-

acteristics of the string in the actual conditions. The reverse recovery charge (QRR) is not always acces-

sible with the datasheet and a measurement is often necessary.

In certain applications using ultra fast diodes of the same lot, where the QRR, and therefore the ∆QRR are

very low, the sharing capacitor can be reduced to zero.

In systems where there is a risk of external overvoltages or where there are transient states not well

known, TRANSIL diodes are a solution to the sharing voltage problem insofar as the total power dissipa-

tion of the TRANSIL string remains compatible with the existing packages for these devices.

REFERENCES

1. B.M. BIRD and K.G. KING: "An introduction to Power Electronics"

2. J.M. PETER - STMicroelectronics: "Analysis and optimisation of high frequency Power rectification"

AN443 Datasheet(PDF) 12 Page - STMicroelectronics