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MPZ2012S221A bảng dữ liệu(PDF) 19 Page - STMicroelectronics

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6.2
Output voltage load regulation
Primary output load regulation
Figure 20 shows negligible primary output voltage variation (normalized to the value measured at IOUT = 0 A) over
the entire output current range for the L6983I with VOUTprim = 5 V.
Figure 20. Load regulation of the primary not isolated output voltage (VIN = 12 V, VOUT_prim = 5 V, fSW = 400
kHz)
Secondary output load regulation
Since there is no regulation loop involving the secondary output, its load regulation depends, to some extent,
on the primary load regulation and is affected by the leakage inductance (see Figure 22) of the transformer,
the voltage drops across to the Schottky diode (diode forward voltage) and the DCR of the secondary coil, as
indicated by the equation (Eq. (1)) (where only the last two contributions are considered). Minimizing all the
mentioned parameters leads to a better load regulation.
As shown in Section 6.1 , the input voltage also plays a role in the isolated output regulation, as depicted by
Figure 21.
Figure 21. Load regulation of the secondary isolated output voltage (VIN = 12 V, VOUT_prim = 5 V, fSW = 400
kHz, N = 6)
-30%
-20%
-10%
0%
10%
20%
30%
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
Isolated output current [A]
Vin = 12V
Vin = 18V
Vin = 24V
L6983I
Output voltage load regulation
DS14040 - Rev 1
page 19/56



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