Application information

STBB3JCC

18/27

DocID025425 Rev 5

Equation 2

Figure 31. Application schematic HB WLED driver

1.

Above listed components refer to typical application. Operation of the STBB3JCC is not limited to the

choice of these external components.

Component

Manufacturer

Part number

Value

C1, C2

Murata

GRM188R60J106ME84

10

μF

C6

Murata

GRM31CB31E226KE15

22

μF

C5

TDK

C1608X7R1H225K

2.2

μF

L1

TDK

VLF403215MT-1R5N

1.5

μH

Coilcraft

XFL4020-152MEB

2.

optional and they are not mounted on the evaluation board).

Standard resistor

4.7 K

R3

Standard resistor

from 47 to 100

Ω

Zener diode

4.7 V 1/4 W

3.

R2 is calculated according to the following formula:

Standard resistor

0.1

Ω 1/4 W

LED

White LED

R

sense

R2

V

FB

I

LED

-----------

100mv

1A

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

0.1

Ω

==

=

=

P

Diss_RSENSE

R2 I

LED

0.1 1

2

0.1W

=

⋅

=

⋅

=

R2

V

FB

I

LED

-----------

100mV

I

LED

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

==