User manual

Motor Control Shield with BTN8982TA
for Arduino
Users Manual 9 V0.9, 2015-03
Figure 7 Motor Control Shield for Arduino with BTN8982TA – Bill of Material (BOM)
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2.3 Important design and layout rules:
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The basis for the following design and layout recommendations is the parasitic inductance of electrical
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wires and design guidelines as described in Chapter three and four of the Application Note BTN8960 /62 /80
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/82 High Current PN Half Bridge NovalithIC
TM
(Rev. 0.3, 2014-09-11).
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 C4, so called DC-link capacitor: This electrolytic capacitor is required to keep the voltage ripple at the Vs-
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pin of the NovalithIC™ low during switching operation (the applied measurement procedure for the
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supply voltage is described in Chapter 3.1 of the Application Note). It is strongly recommended that the
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voltage ripple at the NovalithIC™ Vs-pin to the GND-pin is kept below 1 V peak to peak. The value of C4
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must be aligned accordingly. See therefore Equation (10) in the Application Note. Most electrolytic
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capacitors are less effective at cold temperatures. It must be assured that C4 is also effective under the
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worst case conditions of the application. The layout is very important too. As shown in Figure 6, the
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capacitor C4 must be positioned with very short wiring close to the NovalithIC™. This must be done to
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keep the parasitic inductors of the PCB-wires as small as possible.
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