Safety Standard Certified Ceramic Capacitors/High Voltage ... - Murata

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!Note • Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.• This catalog has only typical specifications. Therefore, please approve our product specifi cations or transact the approval sheet for product specifi cations before ordering.C85E.pdfApr.7,2014High Voltage Ceramic Capacitors !Cautionc !Caution (Rating)1. Operating VoltageWhen DC-rated capacitors are to be used in AC or ripplecurrent circuits, be sure to maintain the Vp-p value of theapplied voltage or the Vo-p that contains DC bias withinthe rated voltage range.When the voltage is applied to the circuit, starting orstopping may generate irregular voltage for a transitperiod because of resonance or switching. Be sure to usea capacitor with a rated voltage range that includes theseirregular voltages.When using the low-dissipation DEA (SL Char.) /DEC (SLChar.) /DEH (C, R Char.) /DES (D Char.) series in a highfrequencyand high-voltage circuit, be sure to read theinstructions in item 4.When DC-rated capacitors are to be used in input circuitsfrom commercial power source (AC filter), be sure to useSafety Certified Capacitors because various regulationson withstand voltage or impulse withstand established foreach type of equipment should be taken into consideration.VoltageDC Voltage DC+AC Voltage AC Voltage Pulse Voltage (1) Pulse Voltage (2)PositionalMeasurementV0-p V0-p Vp-p Vp-p Vp-p2. Operating Temperature and Self-generated HeatKeep the surface temperature of a capacitor below theupper limit of its rated operating temperature range. Besure to take into account the heat generated by thecapacitor itself. When the capacitor is used in a highfrequencycurrent, pulse current or similar current, it mayself-generate heat due to dielectric loss. The frequency ofthe applied sine wave voltage should be less than300kHz. The applied voltage load (*) should be such thatthe capacitor's self-generated heat is within 20°C in anatmospheric temperature of 25°C. When measuring, usea thermocouple of small thermal capacity-K of ø0.1mm inconditions where the capacitor is not affected by radiantheat from other components or surrounding ambientfluctuations.Excessive heat may lead to deterioration of thecapacitor's characteristics and reliability.(Never attempt to perform measurement with the coolingfan running. Otherwise, accurate measurement cannotbe ensured.)*Before using the low-dissipation DEA/DEC (SL Char.)/DEH/DES series, be sure to read the instructions initem 4.3. Fail-SafeWhen the capacitor is broken, failure may result in a shortcircuit. Be sure to provide an appropriate fail-safefunction like a fuse on your product if failure could followan electric shock, fire or fume.Continued on the following page.62
!Note • Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.• This catalog has only typical specifications. Therefore, please approve our product specifi cations or transact the approval sheet for product specifi cations before ordering.C85E.pdfApr.7,2014High Voltage Ceramic Capacitors !CautionContinued from the preceding page.4. Load Reduction and Self-generated Heat DuringApplication of High-frequency and High-voltageDue to the low self-heating characteristics of lowdissipationcapacitors, the allowable electric power ofthese capacitors is generally much higher than that of Bcharacteristic capacitors. However, if the self-heatingtemperature is 20°C under a high-frequency voltagewhose peak-to-peak value equals the capacitor's ratedvoltage, the capacitor's power consumption may exceedits allowable electric power.Therefore, when using the DEA/DEC (SL Char.) /DEH/DES series in a high-frequency and high-voltage circuitwith a frequency of 1kHz or higher, make sure that theVp-p values including the DC bias, do not exceed theapplied voltage value specified in Table 1. Also makesure that the self-heating temperature (the differencebetween the capacitor's surface temperature and thecapacitor's ambient temperature) at an ambienttemperature of 25°C does not exceed the value specifiedin Table 1.As shown in Fig. 2, the self-heating temperaturedepends on the ambient temperature. Therefore, if youare not able to set the ambient temperature toapproximately 25°C, please contact our salesrepresentatives or product engineers. Allowable Conditions at High frequencySeriesDEHDEATemp.Char.CRSLDCRatedVoltage500V1kV2kV3.15kV1kV2kV3.15kVAllowable Conditionsat High-frequency *3AppliedVoltage (Max.)500Vp-p800Vp-p1000Vp-p1400Vp-p2000Vp-p1600Vp-p3150Vp-p1000Vp-p2000Vp-p3150Vp-pSelf-heating Temp.(25°C Ambient Temp.) *120°C Max.20°C Max.5°C Max.20°C Max.5°C Max.20°C Max.5°C Max.5°C Max.DEC SL 6.3kV 6300Vp-p 5°C Max.DESD500V1kV500Vp-p800Vp-p1000Vp-p15°C Max.5°C Max.Capacitor'sAmbientTemp. *2-25 to +85°C*1 Fig. 1 shows the relationship between the applied voltage and the allowable selfheatingtemperature regarding 1 to 3.15kV rated voltage of the DEH series Rcharacteristic and 1kV rated voltage of the DES series D characteristic.*2 When the ambient temperature is 85 to 125°C, the applied voltage needs to befurther reduced. If the DEA/DEH/DES series needs to be used at an ambienttemperature of 85 to 125°C, please contact our sales representatives or productengineers.*3 Fig. 3 shows reference data on the allowable voltage - frequency characteristicsfor a sine wave voltage.We are offering free software, The Capacitor SelectionTool: by Voltage Form, which will assist you in selecting asuitable capacitor.The software can be downloaded from Murata's Web site(http://www.murata.com/products/design_support/mmcsv/index.html).By inputting capacitance values and applied voltagewaveform of the specific capacitor series, this softwarewill calculate the capacitor's power consumption and listsuitable capacitors.When the result of this software is different from themeasurement result of the self-heating temperature onyour side, please contact our sales representatives orproduct engineers.FAILURE TO FOLLOW THE ABOVE CAUTIONS (ITEMS 1TO 4) MAY RESULT, WORST CASE, IN A SHORT CIRCUITAND CAUSE FUMING OR PARTIAL DISPERSION WHENTHE PRODUCT IS USED. Relationship Between Applied Voltage andSelf-heating Temperature (Allowable Self-heatingTemp. at 25°C Ambient Temp.)DEH Series R Char. (Rated Voltage: DC1kV to 3.15kV)Allowable Self-heating Temp. (°C)Allowable Self-heating Temp. (°C)252015105Rated Voltage: 1kV 2kV 3.15kV0100 1000 10000Applied Voltage (Vp-p)DES Series D Char. (Rated Voltage: DC1kV)252015105Rated Voltage: DC1kV0100 1000 10000Applied Voltage (Vp-p)Continued on the following page.63
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