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The important thing needed in the piezo transformer is the energy conversion and the step down voltage waveform to achieve an optimal resonant frequency. Herein we provide an article consist of information about simulating circuit model to develop and design a new step down piezo transformer.
If you need to design a negative voltage source supplied from a positive voltage rail, you may read the following information provide which discussed the simplicity combination of a step down converter and the regulation range of a buck-boost topology.
Within the FAN5631/5632 datasheet, there are descriptions about an efficiency optimizer feature that when enabled, it will changes the switch configuration from 2:1 to 1:1 at the lower treshold of Vin or step-down charge pump operation, pulse-skipping PFM and fractional switch operation, the shutdown, UVLO, short circuit, current limit and thermal shutdown.
In this article you can find LM5118 Basic Buck-Boost Regulator features such as Ultra-wide input voltage range from 3V to 75V, Smooth transition between buck and boost modes, Oscillator synchronization capability, Enable input wide bandwidth error amplifier, and etc.
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