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ACE705225BM+H 数据表(PDF) 5 Page - ACE Technology Co., LTD.

部件名 ACE705225BM+H
功能描述  High efficiency, Low supply current, step-up DC/DC Controller
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制造商  ACE [ACE Technology Co., LTD.]
网页  http://www.ace-ele.com
标志 ACE - ACE Technology Co., LTD.

ACE705225BM+H 数据表(HTML) 5 Page - ACE Technology Co., LTD.

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ACE705
High efficiency, Low supply current, step-up DC/DC Controller
VER 1.4
5
Typical Application
(1) Application with external NMOSFET
Vin
D 1N5817
Vout
L
27uH
EXT
OUT
Cin
ACE705
47uF
Cout
Rload
CE
GND
Cp
100uF Tan
OFF
ON
1nF
Figure 1
(2) Application with external NPN transistor
ACE705
Figure 2
Note: R1=330Ω, C1=10nF. (R1 can be calculated by load. If load is light R1’s value can be added. If load is heavy R1’s value can
be smaller. )
Detailed Description
The ACE705 series are boost structure, voltage-type pulse-frequency modulation(PFM) step-up DC-DC
controller. Only four external components are necessary: an inductor, a schottky diode, an output filter
capacitor and a NMOSFET or a NPN transistor. The step-up DC-DC converter, constructed by ACE705,
can be adjusted from 2.5V to 6.0V, 0.1V step. By using the depletion technics, the quiescent current
drawn from power source is lower than 8uA. The high efficiency device consists of resistors for output
voltage detection and trimming, a start-up voltage circuit, an oscillator, a reference circuit, a PFM control
circuit, a switch protection circuit and a driver transistor.
ACE705 integrates PFM control system. This system controls fixed power switch on duty cycle
frequency to stabilize output voltage by calculating results of other blocks which sense input voltage,
output voltage, output current and load conditions. In PFM modulation system, the frequency and pulse
width is fixed. The duty cycle is adjusted by skipping pulses, so that switch on-time is changed based on
the conditions such as input voltage, output current and load. The oscillate block inside ACE705 provides
fixed frequency and pulse width wave.


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