Modified Buck converter

AN2300

14/21

Rev1

The line regulation of the two Buck converters is shown in Figure 20., Figure 21., the load

regulation in Figure 22., Figure 23., Figure 24. and Figure 25. the efficiency in Figure 26.

Table 6.

Schematics A and B part list modification

Reference

Value

Part type

R1

100

Ω 2W

(schematic A)

56

Ω 2W

(schematic B)

Resistor (bleeder)

C6

47

µF, 25V

Electrolytic capacitor

C7

47

µF, 25V

Electrolytic capacitor

Dz1

12V (schematic B)

Zener diode

R2

0

Ω (schematic B)

L820

µH

Radial inductor

Figure 20. Line regulation @full load (Buck

converter, schematic A)

Figure 21. Line regulation @full load (Buck

converter, schematic B)

Figure 22. Out1 load regulation @ Iout2 = 0

(Buck converter, schematic A)

Figure 23. Out2 load regulation @ Iout1 =

20mA (Buck converter, schematic A)