AN1894 Datasheet, PDF (5/14 Pages) STMicroelectronics – BUCK-BOOST CONVERTER REFERENCE BOARD

AN1894 - APPLICATION NOTE
The PCB layout of the copper connections is depicted in Figure 4. The holes for through-hole
components are not seen in the picture.
The physical appearance of the converter can be observed from Figure 5.
Figure 5: Picture of the Converter
2.1.5 Buck Converter Evaluation and Measurements
The output regulation characteristics can be seen in Figure 6. It shows the variation of the output voltage
with output current at specific DC input voltage. The zener diode D6 was not connected during the
measurements
Figure 6: Output Regulation Characteristics (Parameter is V_in)
19
18
1 25VDC
17
1 50VDC
2 00VDC
2 50VDC
3 00VDC
16
3 50VDC
3 75VDC
15
14
0
0. 02
0.04
0.06
0.08
0.1
Output Current [A]
Using the same measured values, Figure 6 can be redrawn using a different parameter. Figure 7 shows
the variation of the output voltage with input DC voltage change. The output current is the parameter in
this case.
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