2.3 Use of Continuous Pulse Train Generation Circuit
The ASD2-EVAL-001 Evaluation Board is equipped with a continuous pulse train generation circuit. This circuit generates a fixed frequency signal. The board consists of three preset multi-turn potentiometers, as shown in the following figure.Figure 2-7. Continuous Pulse Generation Circuit
Figure 2-8. Continuous Pulse Waveform
POT R69 is used to set/change Duty Cycle of pulse from 5% to 95%.
CAUTION: Microchip does not recommend setting POT at below 5% and above 95%.
POT R70 is used to set/change the hardware Dead-time at leading edge of the pulse by minimum 9 ns and maximum 24 ns. POT R75 is used set/change the hardware Dead-time at trailing edge of the pulse by minimum 9 ns and maximum 44 ns.
Prior to applying these signals to devices, check these signals at the respected connectors. A High-Side continuous pulse (OSC_HI) must be observed at pin 1 of the connector J9, whereas a Low-Side continuous pulse (OSC_LO) must be observed at pin 1 of the connector J10. These signals can be transferred further by placing a 2-pin jumper at pin 1 and pin 2 of the connectors J9 and J10.
Note: Signals can be routed from either the double pulse section or the continuous pulse train section.
CAUTION: Microchip recommends modifying the jumpers and POTs only when the high-voltage side is not powered and discharged.
The following figures show the waveform for POT R69 set at 10%, 50%, and 90%.Figure 2-9. Low-Side Trigger Set at 10% and High-Side Set at 90% with Frequency 10 kHz
Figure 2-10. Low-Side Trigger Set at 50% and High-Side Set at 50% with Frequency 14.5 kHz
Figure 2-11. Low-Side Trigger Set at 90% and High-Side Set at 10% with Frequency 20 kHz
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