ZXLD1366

ZXLD1366

Document number: DS31992 Rev. 7 - 2

22 of 30

www.diodes.com

May 2012

© Diodes Incorporated

A Product Line of

Diodes Incorporated

Figure. 5 ZXLD1366 Minimum Recommended Inductor (SO-8EP)

Diode Selection

For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance Schottky diode* with low reverse leakage at the

maximum operating voltage and temperature.

They also provide better efficiency than silicon diodes, due to a combination of lower forward voltage and reduced recovery time.

It is important to select parts with a peak current rating above the peak coil current and a continuous current rating higher than the maximum

output load current. It is very important to consider the reverse leakage of the diode when operating above 85°C. Excess leakage will increase

the power dissipation in the device and if close to the load may create a thermal runaway condition.

The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will increase the peak voltage on the LX output. If a

silicon diode is used, care should be taken to ensure that the total voltage appearing on the LX pin including supply ripple, does not exceed

the specified maximum value.

*A suitable Schottky diode would be B3100 (Diodes Inc).

0

1020

3040

50

60

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Legend

47µH

68µH

100µH

150µH

47µH

68µH

100µH

150µH

T < 70°C, I

= 1A

CLED

Supply Voltage (V)