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A6986ITR bảng dữ liệu(PDF) 19 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Automotive 38 V, 5 W synchronous iso-buck converter for isolated applications
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5.8
Output voltage load regulation
Primary output load regulation
Figure 18 shows negligible primary output voltage variation (normalized to the value measured at IOUT = 0 A) over
the entire output current range for the A6986I with VOUT = 5.3 V.
Figure 19. Load regulation of the non isolated output
-0.6%
-0.5%
-0.4%
-0.3%
-0.2%
-0.1%
0.0%
0.1%
0.2%
0.3%
0.4%
0.5%
0.6%
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
IOUT_prim [A]
Secondary output load regulation
Since there is not a 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 19) of the transformer,
the voltage drops across to the Schottky diode (diode forward voltage) and the DCR of the secondary coil, as
indicated by equation (1) (where only the last two contributions are considered). Minimizing all the mentioned
parameters leads to a better load regulation.
Figure 20. Effect of the transformer leakage inductance on the isolated output load regulation
-15%
-10%
-5%
0%
5%
10%
15%
10
20
30
40
50
60
70
80
90
100
IOUT [mA]
Lleak = 240nH
Lleak = 700nH
A6986I
Output voltage load regulation
DS13481 - Rev 2
page 19/62



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