WESTCODE An IXYS Company
Medium Voltage Thyristor Types K0566L#440 to K0566L#520
9.3 Calculating VT using ABCD Coefficients
The on-state characteristic IT vs. VT, on page 6 is represented in two ways;
(i) the well established VT0 and rT tangent used for rating purposes and
(ii) a set of constants A, B, C, D, forming the coefficients of the representative equation for VT in
terms of IT given below:
VT = A + B ⋅ ln(IT ) + C ⋅ IT + D ⋅ IT
The constants, derived by curve fitting software, are given below for the hot and cold characteristics. The
resulting values for VT agree with the true device characteristic over a current range, which is limited to
that plotted.
25°C Coefficients
A -3.601622e-3
B 0.3236869
C 1.366986e-3
D -0.03236849
125°C Coefficients
A -1.819017
B 0.79521
C 2.47e-3
D -0.094268
10.0 Snubber Components
When selecting snubber components, care must be taken not to use excessively large values of snubber
capacitor or excessively small values of snubber resistor. Such excessive component values may lead to
device damage due to the large resultant values of snubber discharge current. If required, please consult
the factory for assistance.
11.0 Reverse recovery ratings
(i) Qra is based on 50% Irm chord as shown in Fig. 1
(ii) Qrr is based on a 150µs integration time i.e.
150 µs
∫Qrr = irr .dt
0
(iii)
K
Factor
=
t1
t2
Fig. 1
12.0 Duty cycle lines
The 100% duty cycle is represented on the frequency ratings by a straight line. Other duties can be
included as parallel to the first.
Provisional Data Sheet. Types K0566L#440 to K0566L#520 Issue 1
Page 5 of 11
July, 2008
WESTCODE An IXYS Company
Outline Drawing & Ordering Information
Medium Voltage Thyristor Types K0566L#440 to K0566L#520
101A365
ORDERING INFORMATION
(Please quote 10 digit code as below)
K0566
L#
0
Fixed
Type Code
Outline code
LC = 26mm clamp height
LG = 35mm clamp height
Voltage code
VRRM/100
44 -52
Typical order code: K0566LC440 – 4400V VDRM, VRRM, 27mm clamp height capsule.
Fixed code
IXYS Semiconductor GmbH
Edisonstraße 15
D-68623 Lampertheim
Tel: +49 6206 503-0
Fax: +49 6206 503-627
E-mail: marcom@ixys.de
IXYS Corporation
1590 Buckeye Drive
Milpitas CA95035-7418 USA
Tel: +1 (408) 457 9000
Fax: +1 (408) 496 0670
E-mail: sales@ixys.net
WESTCODE
An IXYS Company
www.westcode.com
www.ixys.net
Westcode Semiconductors Ltd
Langley Park Way, Langley Park,
Chippenham, Wiltshire, SN15 1GE.
Tel: +44 (0)1249 444524
Fax: +44 (0)1249 659448
E-mail: WSL.sales@westcode.com
IXYS Long Beach
3270 Cherry Avenue
Long Beach CA 90807 USA
Tel: +1 (562) 595 6971
Fax: +1 (562) 595 8182
E-mail: WSI.sales@westcode.com
The information contained herein is confidential and is protected by Copyright. The information may not be used or disclosed
except with the written permission of and in the manner permitted by the proprietors Westcode Semiconductors Ltd.
In the interest of product improvement, Westcode reserves the right to change specifications at any time without prior notice.
Devices with a suffix code (2-letter, 3-letter or letter/digit/letter combination) added to their generic code are not necessarily
subject to the conditions and limits contained in this report.
© Westcode Semiconductors Ltd.
Provisional Data Sheet. Types K0566L#440 to K0566L#520 Issue 1
Page 11 of 11
July, 2008
