DocID024885 Rev 1

11/28

AN4319

Measurement results

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3.2

Output voltage ripple

Above measurement are referred at the output voltage ripple (around 85 mV in full load

condition) without inductance filter (R47 = 0R0). A ripple voltage comparison has been done

replacing the 0R resistor with L4 = 0.33

H (Figure 30: Electrical diagram (general) on

page 19). The output voltage ripple, as shown in Figure 7, it is improved (around 40 mV in

full load condition).

Figure 5. Ripple 12 V at 1 A

Figure 6. Ripple 12 V at 500 mA

CH2: output voltage

CH3: output current

CH2: output voltage

CH3: output current

Figure 7. Ripple 12 V at 1 A adding L4 filter

Figure 8. Ripple 12 V at 500 mA adding L4 filter

CH2: output voltage

CH3: output current

CH2: output voltage

CH3: output current