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AN4377 Datenblatt(PDF) 11 Page - STMicroelectronics

Teilenummer AN4377
Bauteilbeschribung  This document focuses on a product evaluation board for a simple
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4377 Datenblatt(HTML) 11 Page - STMicroelectronics

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AN4377
Measurement results
29
3.2
Output voltage ripple
Above measurement are referred at the output voltage ripple (around 30 mV in full load
condition). A ripple voltage comparison has been done replacing a 0.33
H inductor on the
L4 position with a resistor R47 = 0
. The output voltage ripple, as shown in Figure 8, is
around 110 mV in full load condition.
Figure 5. Ripple 5 V at 2 A
Figure 6. Ripple 5 V at 1 A
CH2: output voltage
CH3: output current
CH2: output voltage
CH3: output current
Figure 7. Ripple 5 V at 2 A removing L4 filter
Figure 8. Ripple 5 V at 1 A removing L4 filter
CH2: output voltage
CH3: output current
CH2: output voltage
CH3: output current



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