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MC33765 数据表(PDF) 11 Page - ON Semiconductor |
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MC33765 数据表(HTML) 11 Page - ON Semiconductor |
11 / 16 page 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 + |
类似零件编号 - MC33765 |
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类似说明 - MC33765 |
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