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A Product Line of
Diodes Incorporated
ZXLD1356/ ZXLD1356Q
Application Information (cont.)
Inductor Selection (cont.)
Minimum Recommended Inductor
2% Accuracy, <60°C Case Temperature
15
Legend
14
68uH
13
100uH
12
150uH
11
10
9
8
7
6
5
4
3
2
1
220uH
0
10
20
30
40
50
60
Supply Voltage (V)
Figure 3. ZXLD1356 Minimum Recommended Inductor
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 B1100B (Diodes Inc).
ZXLD1356/ ZXLD1356Q
Document number: DS33470 Rev. 4 - 2
23 of 29
www.diodes.com
October 2012
? Diodes Incorporated
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