ZXLD1374

60V HIGH ACCURACY 1.5A BUCK/BOOST/BUCK-BOOST

LED DRIVER CONVERTER WITH AEC-Q100

ZXLD1374

Document number: DS35032 Rev. 2 - 2

21 of 37

www.diodes.com

March 2011

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Diodes Incorporated

In the case of the Buck-boost topology, the following graphs guide the designer to select the inductor for a target frequency

of 400kHz (figure 36) or higher than 500kHz (figure 37).

 

 

0

10

20

3040

5060

1

3

5

7

9

11

13

15

Supply Voltage (V)

L=22µH

L=33µH

L=47µH

Figure 36: 350mA Buck-boost mode inductor selection for target frequency 400kHz

 

 

0

1020

30

4050

60

1

3

5

7

9

11

13

15

Supply Voltage (V)

L=22µH

L=33µH

L=47µH

Figure 37: 350mA Buck-boost mode inductor selection for target frequency > 500kHz