Construction and Characteristics of

Transcription

1 Functional Polymer Aluminum Solid Electrolytic Capacitors Construction and Characteristics of Construction of Al Foil Case Al Foil Functional Polymer (&Separator) Sealing Rubber Lead ( - ) Lead ( + ) FPCAP is roughly the same construction as an aluminum electrolytic capacitor, and uses rolled aluminum foils in its capacitor element. Manufacturing Process of Etched Al Foil Forming Slitting Winding Forming Polymerization Sealing Tab Terminal Separator Sheet Functional Polymer Assembling Parts Aging and Inspection Shipping 50

2 Equivalent Circuit of Capacitor 0 Cp Rs L Rp Cp : Capacitance Rp : Equivalent parallel resistance (Insulation resistance) ( Rated Voltage/LC) Rs : Equivalent series resistance L : Inductance Imp / ESR (Ω) 0m m ESR Imp R /ωc m 0 k k 0k M M 0M Frequency (Hz) ωl Z = Rs + Rp + ωl ωcprp ( + ω Cp Rp ) ( + ω Cp Rp ) Feature of Functional Polymer 0 Electrolyte (Aluminum Electrolytic Capacitor) Resistivity (Ω cm) Manganese Dioxide (Tantalum Solid Electrolytic Capacitor) TCNQ Complex Salt (Organic Semiconductive Capacitor) PPY by Chemical Polymerization PPY by Electrolytic Polymerization Conductive Polymer (PEDOT) O O S S O PEDT PEDOT FPCAP differs from the aluminum electrolytic capacitor in that in place of the electrolyte, functional polymer is impregnated. O n 5

3 Typical Electrical Characteristics of Capacitors Frequency Dependence 0 0 TA Cap 0µF TA Cap 0µF AL E-Cap 0µF FPCAP 70µF AL E-Cap 0µF FPCAP 70µF Impedance (Ω) 0. ESR (Ω) k k 0k M M 0M Frequency (Hz) k k 0k M M 0M Frequency (Hz) FPCAP has excellent frequency characteristic nearly equal to the film capacitor. Using the high conductivity of the Functional polymer with an electrolyte, and adopting the winding element for layer thinness of electrolyte, the ESR is improved greatly and has the frequency characteristic that is nearly equal to the film capacitor. Typical Temperature Dependence of Capacitors Capacitance (ΔC/C %) MLCC TA Cap AL E-cap FPCAP Temperature ( C) ESR (Ω) MLCC TA Cap AL E-cap FPCAP Temperature ( C) The temperature dependence of the FPCAP is that it features little change in temperature for the ESR. Since ESR is dominant at high range of impedance (near resonance point), the ESR value greatly affects Noise clearing capacity. What ESR changes little against temperature means that Noise clearing ability changes little against temperature as well. 5

4 Frequency Dependence 000 L8 series.5v 560µF (φ8 8L) NU series 6.3V 00µF (φ8.5l) NU series 6V 70µF (φ8.5l) 000 Impedance (mω) 00 0 ESR (mω) HS series 6.3V 390µF (φ8 6.7L) SA series 6.3V 0µF (φ L) SL series 6.3V 0µF (φ6.3 4.L) Impedance (mω) 00 0 ESR (mω) VA series 6V 33µF ( ) UA series 6V 7µF ( ) Impedance (mω) ESR (mω)

5 Resistance to Soldering Heat 0 Test Condition : 60 C, 30sec NS series V 0µF (φ.5l) NS series 6V 33µF (φ6.3 7L) ΔC/C (%) ESR (Ω) at 0kHz Fevering Temperature by Ripple Current 0 L8 series.5v 560µF (φ8 8L) R7 series.5v 80µF (φ8.5l) R7 series 4.0V 80µF (φ.5l) VB series.0v 330µF ( ) Fevering Temperature ( o C) I R = ΔT β S= ΔTc α β S ΔTc = (I R) / (α β S) log ΔTc = log (I R) / (αβs) = log I + log R log αβs = log I + (log R - log αβs) Current (Arms) Where, I : Ripple Current (Arms) R : ESR (Ω) ΔT : Fevering Temp. at Outside Wall of Capacitor ( C) ΔTc : Fevering Temp. at Inside of Capacitor ( C) β : Heat Radiation Coefficient (W/ C cm ) S : Surface Area of Aluminum Case(cm ) α : Ratio of ΔTc/ ΔT 54

6 Reliability at 5 C High-temperature lode 0 Change of Capacitance NS series 6.3V 47µF (φ6.3 7L) L8 series.5v 560µF (φ 8 8L) NS series 4.0V 00µF (φ.5l) VA series 6V 33µF ( ) Relative (%) Duration (H) Absolute (tanδ) Change of Tangent of Loss Angle 0 Duration (H) Change of Leakage Current Absolute (μ A) Duration (H) Change of Equivalent Series Resistance Absolute (mω) Duration (H)

7 Estimating of Lifetime Functional Polymer Aluminum Solid Electrolytic Capacitors Calculation Formula of Lifetime For In general, calculation formula of lifetime of capacitors is appeared as follows. The calculation formula of lifetime on FPCAP is same as usual Aluminum capacitor. LX = L0 (T 0-TX)/0 Where, L X (Hrs) =Life expectance in actual use L 0 (Hrs) =Life time T 0 (5 C) =Maximum operating temperature (5 C) T X ( C) =Temperature of capacitor in actual use On the other hand, temperature Tx adds the circumference temperature T as the capacitor temperature and the generating temperature ΔT by ripple current. TX=T+ΔT T ( C) = Ambient temperature ΔT ( C) = Generating temperature There are two methods to calculate the heat rise (ΔT) of a capacitor by ripple current. a) Measure the temperature of a capacitor in operation by means of fixing a thermocouple on the case of a capacitor or other suitable methods. The temperature difference between the temperature measured of the capacitor and the ambient temperature is considered as the heat rise by ripple current. b) The heat rise by ripple current is calculated by the following formula. ΔT = ( I / I0 ) ΔT0 I (A rms) = Ripple current in actual use I 0 (A rms) = Maximum permissible ripple current ΔT 0 ( C) = Generated temperature value by maximum permissible ripple current [Aluminum Can Type: About 0 C, Molded Chip Type: About C ] Remark:<It is recommended to use the method of formula calculation during the design phase, and use the method of actual measurement when checking as a set.> 56

8 Application Guide Functional Polymer Aluminum Solid Electrolytic Capacitors DC/DC Converter Primary, Secondary Side Smoothing Input side For Primary Side Smoothing +3.3V CIRCUIT +5V CIRCUIT 3.3V FPCAP 6.3V 5V Output side For Secondary Side Smoothing For Secondary Side Smoothing Back-up Capacitor for Variable Load () V 3.3 5V FPCAP 6.3V.6.8V CPU FPCAP 6V FPCAP 6.3V FPCAP.5 4V Back-up Capacitor for Variable Load () 3.3 5V.6.8V CPU FPCAP 6.3V FPCAP.5 4V Noise Filters 57

9 Application Guide Ripple Removal Capability We measured ripple voltage by oscilloscope for output capacitor change on the typical chopper type DC-DC converter. (described below) VOUT=5V, IOUT=0.5A f=0khz Oscilloscope Electronic Load L VIN= V SW D C Specimen Comparison Between and Other Capacitors with Same Capacitance Low Impedance Aluminum Capacitor 6V0uF (φ6.3 L) ΔV=56mV Low ESR Tantalum Capacitor 6V0uF ( ) ΔV=76mV FPCAP 6V0uF (φ8.5l) ΔV=58mV Examination of Same Level Residual Ripple Voltage To obtain same level of ripple voltage to FPCAP, Low Impedance Aluminum capacitor needs 6V3300uF, even Low ESR tantalum capacitor needs 4 pcs. of same capacitance. Low Impedance Aluminum Capacitor 6V3300uF (φ6 5L) ΔV=60mV Low ESR Tantalum Capacitor 6V0uF ( ) 4 pcs. ΔV=59mV 58

10 Application Guide Spice Model for Simulation Circuits with Computer Spice Model of Radial Lead Type (L8 and S8 series) Part Number Cp (μf) Rs (mω) L (nh) LC (μa) Rp (kω) RL80E8MDN RL80G56MDN RL80J56MDN RS80E33MDN RS80E47MDN RS80E56MDN Typical ESL by Case Size Classification Case Size (mm) ESL (nh,40mhz) φ6.3 8L (S8).8 to. φ6.3 L.8 to 3.0 Radial Lead Type SMD Type φ8 8L (L8).7 to 3. φ8.5l 3.9 to 4. φ8.5l (R7) 4.6 to 4.9 φ.5l 5.4 to 5.6 φ4 5.L.0 to. φ L.5 to.7 φ8.7l 3. to 3.3 φ.4l 4.5 to to to.8 Equivalent Circuit of Capacitor Rp Cp Rs L Cp : Capacitance Rp : Equivalent Parallel Resistance (Insulation resistance) ( Rated Voltage/LC) Rs : Equivalent Series Resistance L : Inductance Rp ωcprp Z = Rs + + ωl ( + ω Cp Rp ) ( + ω Cp Rp ) * It is available to present the spice model of other parts for customers. 59