Datasheet 235 EDLC-HVR ENYCAP (Vishay) - 5

235 EDLC-HVR ENYCAP™
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MEASURING OF CHARACTERISTICS CAPACITANCE (C) EQUIVALENT SERIES RESISTANCE (ESRDC)
Capacitance shall be measured by constant current - Constant current charge to UR discharge method. - Constant voltage charge at UR - Constant current charge with 10 mA/F to UR - Constant current discharge to 0.1 V - Constant voltage charge at UR  U V - Constant current discharge with 10 mA/F to 0.1 V ESR  3 = -----------  DC I A D U ESR R Δ DC Equivalent series resistance, in U3 U U R Voltage drop at internal resistance, in V 1 ID Absolute value of discharge current, in A  U2     t t 30 min 1 2 (s)  Fig. 3 - Voltage Diagram for Capacitance Measurement   Capacitance value CR is given by discharge current ID, time  t and rated voltage UR, according to the following equation:           I A x t s - t s C F D 2 1 = -------------------------------- R  U V - U V 1 2    CR Rated capacitance, in F  UR Rated voltage, in V  U1 Starting voltage, 0.8 x UR in V  U2 Ending voltage, 0.4 x UR in V  U  3 Voltage drop at internal resistance, in V Time from start of discharge until voltage U  t 1 is 1 reached, in s  t Time from start of discharge until voltage U2 is 2 reached, in s ID Absolute value of discharge current, in A                     Statements about product lifetime are based on calculations and internal testing. They should only be interpreted as estimations. Also due to external factors, the lifetime in the field application may deviate from the calculated lifetime. In general, nothing stated herein shall be construed as a guarantee of durability. Revision: 08-Oct-2019
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Document Number: 28455 For technical questions, contact: energystorage@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000