AN2627

Selecting components for applications

Doc ID 13913 Rev 2

9/19

2

Selecting components for applications

This section provides information to assist in the selection of the most appropriate

components for applications.

Figure 10 shows a typical application schematic diagram.

Figure 10.

Typical application schematic

2.1

Output voltage selection

The output voltage can be adjusted from 6 V up to 12 V by connecting a resistor divider

between the output and the FB pin.

The resistor divider should be chosen in accordance with the following equation:

Equation 1

The feedback voltage versus temperature is shown Figure 11 below.

It is recommended to use a resistor with a value in the range of 10 k

Ω to 100 kΩ. Lower

values can be suitable as well, but will increase current consumption.

Figure 11.

Voltage feedback vs. temperature

R1

R2

IN

LX

GND

PGND

Vout

OUT

FB

HV

INH

ST8R00

L

Cout

41

8

5

2

3

7

6

Vin

Cin

OFF ON

R1

R2

IN

LX

GND

PGND

Vout

OUT

FB

HV

INH

ST8R00

L

Cout

41

8

5

2

3

7

6

Vin

Cin

OFF ON

V

out

V

R

1

R

2

-------

+

=

with

V

FB

1.22 V

=

1.1

1.12

1.14

1.16

1.18

1.2

1.22

1.24

1.26

1.28

1.3

-75

-50

-25

0

25

50

75

100

125

150

175

T [°C]

Vin=Vinh=5V, Iout=50mA,

L=4.7µH, Cin=10µF, Cout=10µF