ZXLD1366_10 DIODES [Diodes Incorporated], ZXLD1366_10 Datasheet - Page 22

• Manufacturer Part Number: ZXLD1366_10
• Description: HIGH ACCURACY 1A, 60V LED DRIVER WITH INTERNAL SWITCH
• Manufacturer: DIODES [Diodes Incorporated]

Inductor selection
Recommended inductor values for the ZXLD1366 are in the range 68 μH to 220 μH.
Higher values of inductance are recommended at higher supply voltages in order to minimize errors due to switching delays,
which result in increased ripple and lower efficiency. Higher values of inductance also result in a smaller change in output
current over the supply voltage range. (see graphs pages 10- 17). The inductor should be mounted as close to the device as
possible with low resistance connections to the LX and VIN pins.
The chosen coil should have a saturation current higher than the peak output current and a continuous current rating above
the required mean output current.
Suitable coils for use with the ZXLD1366 may be selected from the MSS range manufactured by Coilcraft, or the NPIS
range manufactured by NIC components. The following websites may be useful in finding suitable components.
www.coilcraft.com
www.niccomp.com
www.wuerth-elektronik.de
The inductor value should be chosen to maintain operating duty cycle and switch 'on'/'off' times within the specified limits
over the supply voltage and load current range.
The graph Figure 3 below can be used to select a recommended inductor based on maintaining the ZXLD1366 case
temperature below 60°C. For detailed performance characteristics for the inductor values 68, 100, 150 and 220μH see
graphs on pages 10-17.
ZXLD1366
Document number: DS31992 Rev. 5 - 2
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Legend
68uH
100uH
150uH
220uH
Figure 3 ZXLD1366 Minimum recommended inductor (TSOT23-5)
10
20
Minimum Recommended Inductor
2% Accuracy, <60°C Case Temperature
Supply Voltage (V)
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ZXLD1366
June 2010
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