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L6986I датащи(PDF) 18 Page - STMicroelectronics

номер детали L6986I
подробное описание детали  38 V, 5 W synchronous iso-buck converter for isolated applications
PDF  60 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L6986I датащи(HTML) 18 Page - STMicroelectronics

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4.8
Output voltage load regulation
Primary output load regulation
Figure below shows negligible primary output voltage variation (normalized to the value measured at IOUT = 0 A)
over the entire output current range for the L6986I with VOUT = 5.3 V.
Figure 19. Load regulation of the not 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 below) 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 (1) (where only the last two contribution 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
The input voltage also plays a role in the isolated output regulation. The figure below further proves the slight
dependency of the isolated output voltage on the input voltage.
L6986I
Output voltage load regulation
DS13647 - Rev 1
page 18/60



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