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ACE70335AN+ Fiches technique(PDF) 9 Page - ACE Technology Co., LTD.

No de pièce ACE70335AN+
Description  White LED PFM Step-Up DC-DC Converter
Download  16 Pages
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Fabricant  ACE [ACE Technology Co., LTD.]
Site Internet  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE70335AN+ Fiches technique(HTML) 9 Page - ACE Technology Co., LTD.

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ACE703
                        Technology
White LED PFM Step-Up DC-DC Converter
VER 1.2
9
Firstly, select the appropriate value of L.C. It require the value of L*C be not too large, and the value of
L/C be small. For example, select L=22uH,C=100uF;or L=10uH,C=47uF;etc.
If select L/C>1(such as L=100uH,C=47uF),it is improper in large current(larger than 100mA)
application.
Secondly, add a compensation capacitor C1 to reduce the ripple. However, the value of the
compensation capacitor is different between constant current application and constant voltage mode.C1
and the resistor parallel connected with it will generate a pole, thus, it can compensate the syntonic
frequency made by L.C.
In constant voltage mode, if the resistor parallel connected with C1 is large,(eg: R1=290KΩ) then τ=R1‧
C1 is large, therefore, when C1≥0.1uF,the ripple can be decreased greatly.
But in constant current mode, the resistor parallel connected with C1 is just the equivalent resistor of the
white-LED, about 1Ω.Then,to maintain larger τ require larger compensation capacitor, normally between
10uF to 47uF.Many experiments have proved, when L=22uH,Cout=100uF,C1=22uF,the ripple of the
output voltage, the output current, and the feedback voltage is smallest, and the characteristic of the
constant current is excellent, even the efficiency is highest.
Test circuits
(1) Feedback voltage test circuit
(2) Start-up voltage test circuit(Iload=1mA)
ACE703
ACE703


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