AN2872

Experimental results

Doc ID 15305 Rev 1

13/23

4

Experimental results

4.1

Load regulation and output voltage ripple

The 12 V output is affected by the load due to the effects described in Chapter 3.1.2 and

different input voltages is visible in Figure 6.

Figure 6.

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

The flatness of the load characteristic can be influenced mainly at light load by setting

represent light load. The behavior of the load characteristic can be influenced by the value

The output voltage ripple is very low and presents a good opportunity to use smaller

capacitors with higher ESR and lower capacitance. The data measured with the

demonstration board are shown in Figure 7. It is possible to see the higher 100 Hz ripple at

90 VAC on the input. This ripple can be avoided by increasing the capacitance of the input

capacitors.

10

10.5

11

11.5

12

12.5

13

13.5

14

14.5

15

-20

0

20

40

60

80

100

120

140

160

IOUT (mA)

VOUT (V)

500 V AC

400 V AC

230 V AC

120 V AC

90 V AC

AM00362