744770933 データシートの表示（PDF） - Diodes Incorporated.
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744770933 Datasheet PDF : 33 Pages
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ZXLD1370 Buck-Boost Mode 350mA Minimum Recommended Inductor
Target Switching frequency > 500kHz
ZXLD1370
15
13
11
9
L=47uH
7
5
L=33uH
3
L=22uH
1
0
10
20
30
40
50
60
Supply Voltage (V)
Figure 24: 350mA Buck-Boost mode inductor selection for target frequency > 500kHz
For example, in a Buck-bust configuration (VIN =10-18V and 4 LEDs), with a load current of 350mA; if the target frequency
is around 400kHz, the Ideal inductor size is L= 33uH. The same size of inductor can be used if the target frequency is higher
than 500kHz driving 6LEDs with a current of 350mA from a VIN =12-24V.
In the case of the Boost topology, the following graphs guide the designer to select the inductor for a target frequency of
400kHz (figure 25) or higher than 500kHz (figure 26).
ZXLD1370 Boost Mode 350mA Minimum Recommended Inductor
Target Switching frequency - 400kHz
15
L=47uH
13
11
L=33uH
9
7
L=22uH
5
3
1
0
10
20
30
40
50
60
Supply Voltage (V)
Figure 25: 350mA Boost mode inductor selection for target frequency 400kHz
ZXLD1370
Document number: DS32165 Rev. 2 - 2
17 of 33
www.diodes.com
May 2010
© Diodes Incorporated
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