1/24/2024 0 Comments Simple delay circuit pspice modelComplementary differential outputs allow for floating connections, required for driving high-side MOSFET’s. CLOCKDRIVER incorporates high-impedance buffers on the negative input terminals. Duty cycle is controlled by the input clock. The output is a voltage, level controlled by the duty cycle of the clock input (CLK).ĬLOCKDRIVER creates two out-of-phase, differential, floating clock outputs, with programmable slewrate and deadtime, from a single-ended input clock. 200kHz Pulse Width Modulated (PWM) source is controlled by 60Hz voltage source. This is a DC-to-AC power inverter application with simplified output stage. The typical application circuit is shown in Figure 1. Slowing down the SLEWRATE will help your circuit converge and calculate quickly. High-frequency and low-frequency waveforms will both be present in the analysis. Simulating inverter waveforms takes a lot of computing horsepower, so please be patient with your simulation tools. Computer aided design using this block can help select or confirm values for the output stages. Presented here is another model that will converge cleanly, run quickly, and has been tested and proven.ĬLOCKDRIVER can be utilized for finding optimum operating frequency of synchronous buck converters. Without these tested blocks, we end up troubleshooting their models instead of our circuit. For those of us that love to simulate, we know what a joy it is when a “block” or SPICE model is fully tested and available, ready to drop into our schematic so that we can continue to work on the circuit at hand, to solve and analyze our immediate needs. With the addition of proper building blocks, using traditional SPICE tools (such as Multisim by National Instruments)to simulate power supplies (converting or inverting) becomes much easier. ![]() ![]() Of course, CLOCKDRIVER can also be utilized for driving half-bridge circuits, including traditional Synchronous Buck Converters, however, DUALCLOCK would be a simpler solution in that case with faster analysis times.Ĭircuits and application notes are readily available for DC-to-AC inverters (such as solar power converters), however, modeling these circuits is a different story. For power supply applications, such as true sinewave AC inverters, the designer will want to modulate the pulse width of the incoming clock (PWM signal). The CLOCKDRIVER model presented here, converts one reference input clock to two, differential, out-of-phase clocks with programmable deadtime and slew-rate control. Part One introduced a block called “DUALCLOCK” that generates two floating clock outputs (see PSD, March 2017) for driving half-bridge circuits. This article is Part Two of a mini-series, presenting useful SPICE model blocks to help motor control and power supply designers perform effective simulations.
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