AN4501 datasheet(9/48 Pages) STMICROELECTRONICS

Part #	AN4501

Description	Design of a boost LED driver using L99LD01

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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9 / 48 page

DocID026394 Rev 1

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AN4501

Guideline for the selection of external components

47

The maximal duty cycle of the L99LD01 is respected as well (datasheet parameter: Duty

Cycle, 88% minimum specification).

Step 2: Selection of the inductor

Required inductance value:

The maximum inductor DC current is given by:

According to the definition of the inductor current ripple rMAX, we have:

The minimum inductance value is given by:

An inductance of 6.8µH can be selected, considering a tolerance of +/- 20%.

Inductor maximum peak and RMS current

D

MAX

1

V

IN MIN

η

×

V

OU T

------------------------------

–

1

60.9

×

26

-----------------

–

79.1%

==

=

I

L,M AX

I

OUT

1D

–

MAX

-------------------------

1.0

1

0.791

–

------------------------

4.81A

==

=

I

L,PP@VINMIN,TARGET

r

MAX

I

L,MAX

×

0.5

4.81

×

2.41A

==

=

L

MIN

V

OU T

D

MAX

1D

MAX

–

()

×

F

SW

I

L,PP@VINMIN,TARGET

η

×

--------------------------------------------------------------------------------------

26

0.791

×

10.791

–

()

×

450 10

⋅

3

2.41

0.9

×

---------------------------------------------------------------

4.4µH

∼

==

I

L,PEAK,MAX

I

OUT

1D

MAX

–

-------------------------

V

OUT

D

MAX

1D

MAX

–

()

×

2F

SW

L

×η

×

--------------------------------------------------------------------------

+

=

I

L,PEAK,MAX

1

10.791

–

------------------------

26

0.791

1

0.791

–

()

×

26.8 10

6

–

⋅

450 10

⋅

3

×

0.9

×

--------------------------------------------------------------------------------

+

5.59A

==

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