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ACE70325AN+ Datenblatt(PDF) 7 Page - ACE Technology Co., LTD.

Teilenummer ACE70325AN+
Bauteilbeschribung  White LED PFM Step-Up DC-DC Converter
Download  16 Pages
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Hersteller  ACE [ACE Technology Co., LTD.]
Direct Link  http://www.ace-ele.com
Logo ACE - ACE Technology Co., LTD.

ACE70325AN+ Datenblatt(HTML) 7 Page - ACE Technology Co., LTD.

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ACE703
                        Technology
White LED PFM Step-Up DC-DC Converter
VER 1.2
7
f
R
D
D
L
L
2
)
1
(
min
2
Lf
DVin
R
D
Vin
ax
L
2
)
1
(
Im
2
+
=
Lf
Vin
D
I
=
Δ
2
)
1
(
D
R
r
load
L
Δ
η
Selection of the external components
Thus it can be seen, the inductor and shottky diode affect the conversion efficiency greatly. The inductor
and the capacitor also have great influence on the output voltage ripple of the converter. So it is
necessary to choose a suitable inductor, a capacitor and a right shottky diode, to obtain high efficiency,
low ripple and low noise.
Before discussion, we define: D≣VOUT-VIN/VOUT
(1) Inductor Selection
Above all, we should define the minimum value of the inductor that can ensure the boost DC-DC to
operate in the continuous current-mode condition.
The above expression is got under conditions of continuous current mode, neglect Schottky diode’s
voltage, ESR of both inductor and capacitor. The actual value is greater that it. If inductor’s value is less
than Lmin,the efficiency of DC-DC converter will drop greatly, and the DC-DC circuit will not be stable.
Secondly, consider the ripple of the output voltage,
If inductor value is too small, the current ripple through it will be great. Then the current through diode
and power switch will be great. Because the power switch on chip is not ideal switch, the energy of switch
will improve. he efficiency will fall.
Thirdly, in general, smaller inductor values supply more output current while larger values start up with
lower input voltage and acquire high efficiency.
An inductor value of 3uH to 1mH works well in most applications. If DC-DC converter delivers large
output current (for example: output current is great than 50mA),large inductor value is recommended in
order to improve efficiency. If DC-DC must output very large current at low input supply voltage, small
inductor value is recommended.
The ESR of inductor will affect efficiency greatly. Suppose ESR value of inductor is Rl, Rload is load
resistor, then the energy can be calculated by following expression:
For example: input 1.5V,output is 3.0V,Rload=20Ω,rL=0.5Ω,The energy loss is 10%.
Consider all above, inductor value of 47uH.ESR<0.5Ω is recommended in most applications. Large
value is recommended in high efficiency applications and smaller value is recommended.


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