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ACE701360AN+ датащи(PDF) 4 Page - ACE Technology Co., LTD.

номер детали ACE701360AN+
подробное описание детали  PFM STEP-UP DC/DC Converter with High Efficiency and Low Noise
Download  13 Pages
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производитель  ACE [ACE Technology Co., LTD.]
домашняя страница  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE701360AN+ датащи(HTML) 4 Page - ACE Technology Co., LTD.

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ACE701
                        Technology PFM STEP-UP DC/DC Converter with High Efficiency and Low Noise
VER 1.2
4
LX leakage current
ILXleak
Vout=Vlx=6V
1.0
uA
CE “H” threshold voltage
VCEH
VCE: 0 2V
0.6
0.9
V
CE “L” threshold voltage
VCEL
VCE: 2 0V
0.3
0.6
V
Oscillator frequency
FOSC
LX on “L” side Vout=Vout * 0.96
300
350
400
Khz
Oscillator duty cycle
Maxdty
On (Vlx “L”) side
70
75
80
%
Efficiency
η
85
%
Note :
1.
Diode: Schottky type, such as: 1N5817, 1N5819, 1N5822
2.
Inductor: 27uH(R<0.5Ω)
3.
Capacitor: 100uF (Tantalum type)
Typical Application Circuit
D 1N5819
Vin
Vout
L 27uH
LX
LX
OUT
Iout
Cin 47uF
ACE701
GND
Cout
Rload
100uF
Tan
Detailed Description
The ACE701 series are boost structure, voltage-type pulse-frequency modulation(PFM) step-up DC-DC
converter. Only three external components are necessary: an inductor, an output filter capacitor and a
schottky diode. And the converter’s low noise and low ripple output voltage can be adjusted from 2.5V to
5.0V, 0.1V step. By using the depletion technics, the quiescent current drawn from power source is lower
than 7uA. 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.
The PFM control circuit is the core of the ACE701 IC. This block controls power switch on duty cycle 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 ACE701 provides fixed
frequency and pulse width wave.
The reference circuit provides stable reference voltage to output stable output voltage. Because internal
trimming technology is used, The chip output change less than ±2%. At the same time,the problem of
temperature-drift coefficient of output voltage is considered in design, so temperature-drift coefficient of
output voltage is less than 100ppm/℃。


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