不同种类电容特性比较.ppt

1、INTRODUCTION,元誠科技股份有限公司,Yuan Cheng Technology Co. , Ltd,By Oliver Chen,GENERAL POPULAR CAPACITOR,Multi-layer Ceramic Capacitor OS-CON Capacitor Aluminum Electrolytic Capacitor Tantalum Solid Electrolytic Capacitor Specialty Polymer Capacitor Polymer Organic Semi-conductive Capacitor Film Capacitor,M

2、ulti-layer Ceramic Capacitor,Separate the system loop and the capacitors used,Digital loop Analog loop,combined ratio,Logic loop High Frequency loop Power loop Audio loop Other loop,75%,25%,Decoupling Back up,Major used around Digital IC to filter Noise,Smoothing Filter Resonant Coupling,Impedance &

3、 ESR considered more important than capacitance,Must consider temperature characteristics and capacitance on design,Loop separated,Capacitor Functions,Factor of Sound Mechanism(MLCC),Dielectric Constant of Material DC Bias Voltage Frequency Range Layout of Mother Board,Mechanism of Sound Effect (MLC

4、C),Piezo Electric with DC-Bias Vibration of MLCC With AC Current ElectricalMechanical,Mother Board Resonated With MLCC Big Sound (Like Speaker) SRF of MLCC Become Lower,Sound Effect of MLCC,Phenomenon Analysis Understanding,Qualitative Analysis Mechanism of Vibration ( Simulation ),Solution for Piez

5、o Effect,Quantitative Analysis Vibration - Sound Analysis,|z|,ESR,Frequency,xc,XL,SRF,SRF:Series Resonance Frequency,SRF fc=1/2 LC |Z|= ESR2+(XC-XL)2 1.if the working frequency = SRF ,XC-XL=0, |Z|=ESR 2.if the working frequency SRF, |Z| dominated by XL,About MLCC Impedance Features,Typical ESR and E

6、SL factors in capacitor ( 100K 10MHz ),Impedance = R 2 + ( 2f L 1/2f c) 2, Values of Tantalum electrolytic capacitor may vary depending on case size,FREQUENCY(KHZ),FREQUENCY(KHZ),FREQUENCY(KHZ),FREQUENCY(KHZ),X7R 1206 1UF/16V,X7R 1206 2.2UF/16V,X7R 1206 1.5UF/16V,X7R 1206 3.3UF/10V,Capacitance Chara

7、cteristics of Frequency,ESR Characteristics of Frequency,Temperature Characteristics of Capacitance,No Bias,D/D converter output,D/D converter input,OS-CON,Aluminum solid capacitors with organic semi-conductive electrolyte,Features of OS-CON OS-CON is a low ESR capacitor ESR of OS-CON is not depende

8、nt on temperature OS-CON has long-life OS-CON is a capacitor that has polarity but that is strong against reverse voltage High conductivity provides stability against temperature because has low resistance value compared to other electrolytes.,Reliability Presumption of Life,L2=L1X10 T2-(T1+Tx) /20,

9、L2:Life expectance(Hrs) in actual use (temperature T1),L1:Guaranteed(Hrs) at maximum temperature in use,T2:maximum operating temperature (),T1:Temperature in actual use (ambient temperature) (),Tx:Self-heating temperature by ripple current (),Tx=(Ix/Io) 2 xT,Io:Maximum allowable ripple current at +4

10、5 or less (Arms),Ix:Actual flow of ripple current (Arms),T varies according to case size,OS-CON Electrical Characteristics,Frequency Characteristics Temperature Characteristics Bias Characteristics,Temperature vs. Tan,Temperature vs. Capacitance Change,Temperature ( ),Temperature ( ),A 1uf/25WV,C 10

11、uf/16WV,F 150uf/16WV,Tan ,Capacitance Change ( % ),(120HZ),(120HZ),A 1uf/25WV,B 10uf/10WV,C 10uf/16WV,D 47uf/6.3WV,E 100uf/16WV,F 150uf/16WV,Temperature vs. Leakage current,(Rated Voltage),Temperature vs. Impedance,(100KHZ),Leakage current (uA),Impedance (),Temperature ( ),Temperature ( ),Temperatur

12、e Characteristics,100,ESR(),Temperature ( ),OS=OS-CON Purple Al=Al-E Cap Blue Ta=Tantalum Green CR(X5P)=Ceramic Cap Red CR(X5U)=Ceramic Cap - Pink,Temperature Characteristics,OS=OS-CON Purple Al=Al-E Cap Blue Ta=Tantalum Green CR(X5P)=Ceramic Cap Red CR(X5U)=Ceramic Cap - Pink,Bias Voltage Character

13、istics,OS.1=OS-CON (10SL10M)-Purple,OS.2=OS-CON (30SC10M)-Light purple,CR(X5P)=Ceramic Cap(10uf/10V) -Red,CR(X5U)=Ceramic Cap(10uf/50V) -Pink,Aluminum Electrolytic Capacitors,Material of Aluminum Electrolytic capacitor,Common Application Conditions to Avoid,The following misapplication load conditio

14、ns will cause rapid deterioration of a capacitors parameters. In addition,rapid heating and gas generation within the capacitor can occur,causing the pressure relief vent to operate and resultant leakage of electrolyte.Under extreme conditions,explosion and fire ignition could happen. The leaked ele

15、ctrolyte is combustible and electrically conductive,Reverse Voltage Repeating Charge/Discharge applications Over Voltage Exceeding Ripple current,Operating Temperature and Frequency,(1) Effect of operating temperature on electrical parameters a) At higher temperature,leakage current and capacitance

16、increase while ESR decreases. b) At lower temperature,leakage current and capacitance decreases while ESR increases. (2) Effect of operating frequency on electrical parameters a) At higher frequency,capacitance and impedance decrease while tan increases. b) At lower frequency,heat generated by rippl

17、e current will rise due to an increase in ESR.,Application guidelines,Operating Temperature and Life expectancy,The formula for calculating expected life is as follows L1: Guaranteed life ( h ) at temperature , T1 L2: Expected life ( h ) at temperature , T2 T1: Upper category temperature ( ) T2: Act

18、ual operating temperature ( ),L2 = L1 X 2 T1-T2/10,* Example *,If the specification is 2000hours at rated voltage/105 test Actually,the capacitor surface temperature is 85 L2=2000 hours * 2 105 - 85 /10 =8000 hours,How to calculate the ripple current for actual application,If the specification is 12

19、30mA/rms at 105 /100 KHz Actual measure the capacitor surface temperature is 85/100KHz Maximum permissible ripple current = 1230mA*1*1.7=2091mA/rms,*Example*,Capacitance vs. Temperature Characteristics,Impedance , ESR vs. Frequency Characteristics,Leakage current vs. Temperature Characteristics,Tan

20、vs. Frequency Characteristics,Tantalum Solid Electrolytic Capacitor,Material of Tantalum solid electrolytic capacitor,Circuit Design,Tantalum capacitor temperature de-rating voltage,Change in capacitance ( Dipped type),4.7f/16V,Temperature ( ),Capacitance change (%),Temperature Characteristics,Chang

21、e in leakage current( Dipped type),4.7f/16V,Leakage current(A),Temperature (),Temperature Characteristics,Frequency ( Hz ),capacitance change ( % ),Change in capacitance (Dipped type),4.7uf/16V,Frequency Characteristics,Frequency ( Hz ),Change in Tan (Dipped type),4.7f/16V,Tan,Frequency Characterist

22、ics,Reverse Voltage,SPECTIALTY POLYMER CAPACITOR,Material of Specialty Polymer Aluminum Electrolytic Capacitor,1000,100,10,1,0.1,0.01,TCNQ,MnO2,Electrolyte,Specialty polymer,Organic semi-conductive,Tantalum,Aluminum,SP-CAP,Conductivity ( S/cm),Material of electrolyte comparison,SPECTIALTY POLYMER CA

23、PACITOR,Features of SP-cap Large capacitance Very low ESR & low impedance characteristics Stable capacitance characteristics High ripple current capability Strong surge voltage characteristics Full voltage can be applied , no voltage de-rating,Resistivity .cm,Insulation of specialty polymer itself,F

24、requency Characteristics,Frequency Characteristics,Stable Temperature characteristics,Stable Temperature characteristics,(1)SP-Al 100uf/6.3V (2)Polymer tantalum capacitor 100uf/10V (3)Ceramic capacitor 100uf/6.3V (4)Low ESR tantalum capacitor 100uf/10V,Stable capacitance characteristics,(1)SP-Al 100uf/6.3V (2)Polymer tantalum