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AIC1639-50CX Datasheet(PDF) 10 Page - Analog Intergrations Corporation |
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AIC1639-50CX Datasheet(HTML) 10 Page - Analog Intergrations Corporation |
10 / 11 page AIC1639 3-PIN ONE-CELL STEP-UP DC/DC CONVERTER SPEC NO: DS-1639-00 05/26/00 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 10 Valley current (Iv) is − − − − − − + = 2 x 1 Ton 2L Vsw Vin Iout 2 x Vsw Vin Vsw Vd Vout IV Table 1 Indicates resistance and height for each coil. Power Inductor Type Inductance ( µH ) Resistance ( Ω ) Rated Current (A) Hieght (mm) 47 0.25 0.7 Sumida SMT Type CD54 100 0.50 0.5 4.5 47 0.25 0.7 Hold SMT Type PM54 100 0.50 0.5 4.5 Hold SMT Type PM75 33 0.11 1.2 5.0 Huan Feng PIN Type V0810 33 40m 2 10.0 CAPACITOR SELECTION A poor choice for a output capacitor can result in poor efficiency and hight output ripple. Ordinary aluminum electrolytics, while inexpensive may have unacceptably poor ESR and ESL. There are low ESR aluminum ca- pacitors for switch mode DC-DC converters which work much better than general porpuse unit. Tantalum ca- pacitors provide still better performance at more expen- sive. OS-CON capacitors have extremely low ESR in a small size. If capacitance is reduced, output ripple will increase. Most of the input supply is supplied by the input by- passs capacitor, the capacitor voltage rating should be at least 1.25 times greather than a maximum input volt- age. DIODE SELECTION Speed, forward drop, and leakage current are the three main consideration in selecting a rectifier diode. Best performance is obtained with Schottky retifier diode such 1N5819. Motorola makes MBR0530 in surface mount. For lower output power a 1N4148 can be used although efficiency and start-up voltage will suffer sub- stantially. COMPONENT POWER DISSIPATION Opeating in discontinuous mode, power loss in the winding resistance of inductor can be approximate equal to ( ) ( ) Pout Vout Vd Vout Rs L Ton PDL + = 3 2 where Pout=Vout * Iout ; Rs=Inductor DC R; VD = Diode drop. The power dissipated in a switch loss is ( ) ( ) Pout Vout Vin Vd Vout Ron L Ton PDsw − + = 3 2 The power dissipated in rectifier diode is ( ) Pout Vout Vd PDd = |
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