List of figures

AN2872

4/23

Doc ID 15305 Rev 1

List of figures

Figure 1.

The STEVAL-ISA010V1 demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2.

Buck converter schematic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3.

Standard implementation of a buck converter with a monolithic device . . . . . . . . . . . . . . . . 8

Figure 4.

Schematic of the step-down converter based on the VIPer16L . . . . . . . . . . . . . . . . . . . . . . 9

Figure 5.

PCB layout of the buck converter (top, bottom, bottom layout) . . . . . . . . . . . . . . . . . . . . . 11

Figure 6.

12 V output load regulation for different output loads and input voltage levels

(linear regulator U2 not assembled) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 7.

Output voltage ripple for different input voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 8.

Alternative schematic of the input part using balancing Zener diodes instead of

resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 9.

Standby consumption for different input voltage levels . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 10.

Efficiency of the converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 11.

Drain voltage (CH1) and inductor current (CH4) at different input voltages . . . . . . . . . . . . 17

Figure 12.

Indication of current (CH4) and drain voltage (CH1) during short-circuit . . . . . . . . . . . . . . 18

Figure 13.

EMI measurements of the demonstration board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20