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ACE705255BM+ Datasheet(PDF) 7 Page - ACE Technology Co., LTD. |
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ACE705255BM+ Datasheet(HTML) 7 Page - ACE Technology Co., LTD. |
7 / 14 page ACE705 Technology High efficiency, multi-funtion step-up DC/DC Controller VER 1.2 7 (2)Output 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. (5)Vout~GND filter Capacitor Because the chip’s switch current flows from Vout pin, then through the chip into GND pin. Therefore if the output capacitor’s two pins were not very near the chip’s Vout pin and GND pin, Vout ‘s stable would be affected. User will found that the output voltage will drop when load grows up if the output capacitor’s two pin is not very near the chip’s Vout pin and GND pin. In this condition, 1nF ceramic capacitor is recommended at very near the chip’s Vout pin and GND pin. So in all ACE705 application, two capacitors are needed to obtain stable output voltage. The 100μF tantalum output capacitor is recommended to stable output voltage nearby load. The 1nF Vout pin to GND pin ceramic filter capacitor is recommended to stable chip’s sense voltage. |
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