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ACE701455AM+ 데이터시트(PDF) 6 Page - ACE Technology Co., LTD. |
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ACE701455AM+ 데이터시트(HTML) 6 Page - ACE Technology Co., LTD. |
6 / 13 page ACE701 Technology PFM STEP-UP DC/DC Converter with High Efficiency and Low Noise VER 1.2 6 For example: input 1.5V, output is 3.0V, Rload=20Ω, rL=0.5Ω, The energy loss is 10%. Consider all above,inductor value of 47uH、ESR<0.5Ω is recommended in most applications. Large value is recommended in high efficiency applications and smaller value is recommended (2)Capacitor Selection Ignore ESR of capacitor,the ripple of output voltage is: R=ΔVout / Vout=D / Rload Cf So large value capacitor is needed to reduce ripple. But too large capacitor value will slow down system reaction and cost will improve. So 100uF capacitor is recommended. Larger capacitor value will be used in large output current system. If output current is small (<10mA), small value is needed. Consider ESR of capacitor,ripple will increase: r'=r+Imax‧RESR / Vout When current is large, ripple caused by ESR will be main factor. It may be greater than 100mV。The ESR will affects efficiency and increase energy loss. So low-ESR capacitor (for example: tantalum capacitor) is recommend or connect two or more filter capacitors in parallel. (3)Diode Selection Rectifier diode will affects efficiency greatly,Though a common diode (such as 1N4148) will work well for light load,it will reduce about 5%~10% efficiency for heavy load,For optimum performance, a Schottky diode (such as 1N5817、1N5819、1N5822) is recommended. (4)Input Capacitor If supply voltage is stable, the DC-DC circuit can output low ripple, low noise and stable voltage without input capacitor. If voltage source is far away from DC-DC circuit, input capacitor value greater than 10uF is recommended. Test Circuits (1) Output voltage test circuit (Iload=1mA) ACE701 |
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