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MC33765 数据表(PDF) 11 Page - ON Semiconductor

部件名 MC33765
功能描述  Very Low Dropout/Ultra Low Noise 5 Outputs Voltage Regulator
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

MC33765 数据表(HTML) 11 Page - ON Semiconductor

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MC33765
http://onsemi.com
11
DESIGN HINTS
Reducing the cross–talk between the MC33765 outputs
One of the origin of the DC shift finds its seat in the layout
surrounding the integrated circuit. Particular care has to be
taken when routing the output ground paths. Star grounding
or a ground plane are the absolute conditions to reduce the
noise or shift associated to common impedance situations,
as depicted by Figure 17.
Figure 17. Star Cabling Avoids Coupling by Common Ground Impedance
WRONG
CORRECT
116
15
14
13
12
11
10
9
2
3
4
5
6
7
8
116
15
14
13
12
11
10
9
2
3
4
5
6
7
8
Load1
Load2
Load1
Load2
Star cabling
common impedance shift
Rlayout
The first left cabling will generate a voltage shift which will
superimpose on the output voltages, thus creating an
undesirable offset. By routing the return grounds to a single
low impedance point, you naturally shield the circuit against
common impedance disturbances. Figure 18 portraits the text
fixture implemented to test the response of the MC33765.
Figure 18. DC Shift Text Fixture
116
15
14
13
12
11
10
9
2
3
4
5
6
7
8
1
µF
470nF
10k
Output 3
Output 4
100nF
10k
10k
10nF
18
56
VCC
+


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类似说明 - MC33765

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