Typical application

STLD40D

8/16

Doc ID 12203 Rev 7

6

Typical application

Note:

The external components proposal should be considered as a design reference guide.The

performances mentioned in the electrical characteristics table are not guaranteed for all the

possible electrical parameters of the components included in this list. On an other hand the

operation of STLD40D is not limited with the use of components included in this list.

Figure 3.

Application circuit

Table 6.

External component proposal (see

Figure 3)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

D

Boost schottky diode

VRRM

40

V

0.5

V

30

µA

STPS1L40M

VRRM

40

V

0.46

V

21

µA

Feedback LED current regulation

resistor

8

Ω

Current peak setting resistor

12

100

k

Ω

Input filtering capacitor

Ceramic Type

2.2

µF

Output capacitance: ceramic low

ESR

Capacitance

4.7

µF

Voltage

35

V

ESR

1.6

Ω

L

Boost inductor (height < 2 mm)

Inductance

4.7

µH

DCR

1

Ω

1

A