The corresponding energy can be calculated by :

=

∫

o

v. i dt

by using this formula and the switching oscillogram

of the DTV64D we find :

µ J

Switching ON losses are given by :

= Won x F

Example : With a DTV64D

Ip = 6A

dIF/dt = 60A/

µs

Tj = 100°C

F = 64kHz

We have

µ J

and

The reverse losses due to the leakage current are

negligible and the switching OFF losses with ST

damper diodes are also negligible.

So total losses in the damper diodes are the sum of

the conduction losses and the switching ON

losses :

Example : DTV64D

Ip = 6A

δ = 0.45

F = 64kHZ

PT = 2.1W

CONCLUSION

The new damper diodes have been optimized for

horizontal deflection circuits working at high

frequencies.

A

new

technology

has

been

developed to reduce the peak forward voltage as

much as possible. The compromise between trr

and VF has been chosen to be sure that switching

OFF losses are negligible. SGS THOMSON offers

high

frequencies

damper

diodes

DTV64D,

DTV82D, DTV110D for operation typically at 64,

82 and 110kHz. Obviously each diode can be used

for higher frequencies : for example a DTV82D can

be used at 110kHz, in this case the total losses will

be higher than with a DTV110D.

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the

consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No

license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned

in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.

SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express

written approval of SGS-THOMSON Microelectronics.

© 1996 SGS-THOMSON Microelectronics - Printed in Italy - All rights reserved.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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®

APPLICATION NOTE

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