PCN 120713

Product Change Notice
Notice: #120713
Date: JUL 13 2012
To Our Valued Customers:
We appreciate your use of VI Chip products. Our commitment to customer satisfaction is
demonstrated by our notification to you of the following change.
Description:
VI Chip VTM reverse inrush protection functionality has been standardized across the whole
portfolio. The half-chip VTMs referenced below have been brought in line with the range.
Reverse inrush protection inhibits the flow of current in the reverse direction (output to input) of
a VTM during the startup phase. This feature is important in applications where sensitive
electronics in the system may react negatively to a dV/dt caused in the system by the rapid
discharge of capacitive stored energy on the output of a VTM. Reverse Inrush Protection (RIP)
prevents the rapid discharge of this stored energy by preventing reverse current flow, thereby
keeping the stored charge on the secondary side of the VTM.
As updated, the VTM will function bi-directionally when enabled.
Product datasheets have been updated to reflect the change and the relevant section (16) is
included in this PCN as an appendix (old and new versions shown).
Products Affected:
Half-chip VTMs with 1.5V, 2V nominal output:
VIV0102THJ
VIV0103THJ
VTM48EF015T050A00
VTM48EF020T040A00
Schedule / Datecodes:
Parts shipped from 10 JUN 2012 (marked with week code 1224) have the updated function.
Action Required:
Vicor does not expect any change in customer application performance. However customers
may like to verify that operation is consistent.
Technical Contact:
Ian Mazsa
25 Frontage Road
Andover, MA 01810
Vicor, 25 Frontage Road, Andover MA01810,
Tel: (978) 470-2900, FAX: (978) 475-6715
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Appendix:
Revised description of Reverse
Operation
Original description of Reverse
Current Protection
Vicor, 25 Frontage Road, Andover MA01810,
Tel: (978) 470-2900, FAX: (978) 475-6715
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