Application Note 25 2011-07-06
3.2 Star connection for IC
1. Connect the following ground directly back to Vcc 100nF cap ground (please refer to the red
curves in the circuit diagram below)
• FREQ pin resistor ground
• Delay pin resistor ground
• SRD resistor ground
2. Connetc the following ground with
minF
R
ground(refer to the green curves)
• SS cap ground
• Opto-coupler ground
3. Connect SR pulse transformer and driving circuit ground to VCC Ecap ground(refer to the yellow
curve)
4. Put 100nF ceramic cap to driver supply (refer to the blue arrow)
5. Connect all other ground using ground plane or ground track back to IC VCC 100nF cap ground
or VCC E cap ground
Figure 16 PCB layout tips
shorted
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