ZXLD1374 datasheet(21/35 Pages) DIODES

tên linh kiện	ZXLD1374

Giải thích chi tiết về linh kiện	60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST LED DRIVER CONVERTER

PDF	35 Pages

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nhà sản xuất	DIODES [Diodes Incorporated]

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21 / 35 page

ZXLD1374

Document number: DS35032 Rev. 1 - 2

Page 21 of 35

www.diodes.com

October 2010

A Product Line of

Diodes Incorporated

Applications Information (Continued)

For example, in a Buck-boost 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 38) or higher than 500kHz (figure 39).

304050

Supply Voltage (V)

L=22uH

L=33uH

L=47uH

Figure 38: 350mA Boost mode inductor selection for target frequency 400kHz

1020

3040

Supply Voltage (V)

L=22uH

L=33uH

L=47uH

Figure 39: 350mA Boost mode inductor selection for target frequency > 500kHz

ZXLD1374 bảng dữ liệu(PDF) 21 Page - Diodes Incorporated