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ELM9550D-S Datasheet(PDF) 4 Page - ELM Technology Corporation |
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ELM9550D-S Datasheet(HTML) 4 Page - ELM Technology Corporation |
4 / 5 page 4 ■Typical characteristics • Vout=2.7V (ELM9527D) (Top=25°C, L=220μH, D=MA721, C=47μF) 012 1 2 3 Vin (V) Vout - Vin Iout =1mA 3mA 10mA 012 50 60 70 80 90 100 0 10 20 30 40 50 Vin (V) Efficiency,VRp-p - Vin (Iout =1mA) VRp-p EFFICIENCY EFFICIENCY-Vin RIPPLE VOLTAGE-Vin EFFICIENCY RIPPLE VOLTAGE ■External parts When choosing choke coil, please select that whose core is not magnetically saturated, DC resistance is low, and which has sufficient margin for rated current. For ELM95 series, ELM recommends following coil. • CM-5/CM-5N (Sumida Electric Co., Ltd.) 1) Coil When choosing diode, please select that whose forward voltage is small, switching speed is high and which has sufficient margin for rated current. For ELM95 series, ELM recommends schottoky diodes. 2) Diode When choosing capacitor, please select that whose capacity is comparatively large and voltage limit is at least three times larger than rated output voltage of used ELM95 series. For ELM95 series, ELM recom- mends to use “Aluminum electrolytic capacitor”. When using capacitors such as “Tantalum capacitor” or “Laminated ceramic capacitor”, there may be cases that few hundred hertz wave motion will happen in out- put voltage wave form. Under such circumstances, ELM recommends connecting resistance (1.0Ω approx.) to capacitor serially as following. 3) Capacitor To design DC/DC converter with ELM95 series, coil, diode, and capacitor are necessary. (Refer to standard circuit configuration.) 5 - ELM95xxD CMOS PWM step-up DC/DC converter |
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