STLA02

Introduction

Doc ID 010005 Rev 1

15/23

For nominal operation, the peak inductor current can be calculated by the formula:

Equation 2

where:

Peak inductor current

ν

Efficiency of the STLA02

L

Inductance value of the inductor

f

Switching frequency

For the optimal function of the STLA02 device, it is recommended to use the inductor value

10 µH and higher with low serial resistance and relevant saturation current calculated from

the equation above.

resistor must be rated for a power dissipation of 10 x 0.02² W = 0.004 W.

PCB layout

STLA02 is a powerful switched device, the PCB must be designed in line with rules for

designing switched supplies. It is recommended to use a two layer PCB. The power wirings

must be as short as possible and wide. Place all external components close to the STLA02.

High-energy switched loops should be as small as possible to reduce EMI. Most LEDs need

cooling, which may be done by a defined area of copper on the PCB. Use the reference

4 and 5. When a change of PCB layer is needed, use enough vias. During routing the PCB

must be focused on the minimum area of the application ground - the smaller the ground

recommended to place the copper plate, connected through the vias to the Exposed pad, on

the bottom layer to create the heatsink of the device.

a.

ground of the DEVICE and GND connection of the load.

()

[

]

IN

OUT

2

OUT

2

IN

IN

OUT

OUT

PEAK

V

V

V

f

L

2

V

V

V

I

I

∗

⎪⎭

⎪

⎬

⎫

⎪⎩

⎪

⎨

⎧

∗

∗

∗

∗

−

+

⎟

⎠

⎞

⎜

⎝

⎛

ν

=