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ACE705238BM+ データシート(PDF) 7 Page - ACE Technology Co., LTD.

部品番号 ACE705238BM+
部品情報  High efficiency, Low supply current, step-up DC/DC Controller
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メーカー  ACE [ACE Technology Co., LTD.]
ホームページ  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE705238BM+ データシート(HTML) 7 Page - ACE Technology Co., LTD.

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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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