5/9

Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.1.4 Nov.06, 2019

AX5203











 





3

4

1

1.0

R

R

V

V

OUT

Table 1 Resistor select for output voltage setting

VOUT

R3

R4

12V

1K

11K

18V

1K

17K

24V

1.3K

30K

40V

1K

39K

65V

1K

64K

Inductor Selection

For most designs, Low inductance values are physically smaller but require faster

switching, which results in some efficiency loss. The inductor value can be derived from the

following equation:





f

I

V

V

V

V

L

LX

L

OUT

IN

OUT

IN













Where is inductor Ripple Current. Large value inductors lower ripple current and small

value inductors result in high ripple currents. Choose inductor ripple current approximately

15% of the maximum input current 1.6A, ΔIL=0.24A.

Table 2 Inductor select for output voltage setting (VCC=12V)

VOUT

18V

24V

40V

65V

L1 Value

33uH

47uH

68uH

82uH

The DC current rating of the inductor should be at least equal to the maximum load

current plus half the ripple current to prevent core saturation (1.6A+0.12A).