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Micrel, Inc.
Inductor
According to the above equation, choose the inductor to
MAQ3203
Given an inductor value, the size of the inductor can be
determined by its RMS and peak current rating.
make the operating frequency no higher than 1.5MHz.
The following Tables give a reference inductor value and
corresponding frequency for a given LED current. For
space-sensitive applications, smaller inductor with higher
Δ I L
I L
= 2 ×
V CS( MAX ) - V CS( MIN )
V CS ( MAX ) + V CS ( MIN )
= 0 . 18
switching frequency could be used but efficiency of the
I L ( RMS ) L I +
=
regular will be reduced.
2
1
12
Δ I L 2 ≈ I L
Table 2. Inductor for VIN = 12V, 1 LED
RCS ( ? ) I LED (A) L (μH) F SW (kHz)
1.33 0.15 220 474
I L ( PK ) = I L +
1
2
Δ I L = 1 . 09 I L
0.56
0.4
0.28
0.2
0.13
0.1
0.08
0.068
0.35
0.5
0.7
1.0
1.5
2.0
2.5
3.0
100
68
47
33
22
15
12
10
439
461
467
475
463
522
522
533
where:
I L is inductor average current.
Select an inductor with saturation current rating at least 30%
higher than the peak current.
MOSFET
MOSFET selection depends upon the maximum input
voltage, output LED current and switching frequency.
The selected MOSFET should have 30% margin on
Table 3. Inductor for VIN = 24V, 4 LEDs
RCS ( ? ) I LED (A) L (μH) F SW (kHz)
1.33 0.15 470 474
0.56 0.35 220 426
0.4 0.5 150 447
maximum voltage rating for high reliability requirements.
The MOSFET channel resistance R DSON is selected such
that it helps to get the required efficiency at the required LED
currents as well as meets the cost requirement.
Logic level MOSFETs are preferred as the drive voltage is
limited to 5V.
0.28
0.2
0.13
0.1
0.08
0.068
0.7
1.0
1.5
2.0
2.5
3.0
100
68
47
33
27
22
470
493
463
507
496
517
The MOSFET power loss has to be calculated for proper
operation. The power loss consists of conduction loss and
switching loss. The conduction loss can be found by:
2
P LOSS ( CON ) = I RMS ( FET ) × R DSON
I RMS ( FET ) = I LED × D
Table 4. Inductor for VIN = 36V, 8 LEDs
RCS ( ? ) I LED (A) L (μH) F SW (kHz)
D =
V TOTAL _ LED
V IN
1.33
0.56
0.4
0.28
0.2
0.13
0.1
0.08
0.068
March 2011
0.15
0.35
0.5
0.7
1.0
1.5
2.0
2.5
3.0
470
220
150
100
68
47
33
27
22
495
446
467
490
515
485
530
519
541
12
M9999-032411-A
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