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MPZ2012S221A датащи(PDF) 21 Page - STMicroelectronics

номер детали MPZ2012S221A
подробное описание детали  38 V, 10 W synchronous iso-buck converter for isolated applications
PDF  56 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

MPZ2012S221A датащи(HTML) 21 Page - STMicroelectronics

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Figure 24. Primary output efficiency vs. switching frequency (VIN = 12 V, VOUT_prim = 5 V, secondary
isolated output (not loaded)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0
0,5
1
1,5
2
2,5
3
Primary output current [A]
fsw = 200 kHz
fsw = 400 kHz
fsw = 700 kHz
Secondary isolated output
Figure 25 shows the efficiency referred to the secondary isolated output at different input voltages, whose effect
on the efficiency is more evident at lower currents.
Figure 25. Secondary isolated output efficiency at different input voltages (VOUT_prim = 5 V, fSW = 400 kHz,
N = 6)
0%
20%
40%
60%
80%
100%
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Isolated output current [A]
Vin = 12 V
Vin = 18 V
Vin = 24 V
Figure 26 depicts the efficiency variation with the switching frequency. A lower switching frequency contributes
to a better efficiency by improving the load regulation (higher isolated output voltage, that is, higher power), in
addition to the obvious lower switching losses.
L6983I
Efficiency
DS14040 - Rev 1
page 21/56



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