Feature: Power


Figure 9: The thermal performance of a four-phase interleaving the LT8627SP at 1MHz FSW, at 12VIN


and 0.8VOUT


60A


it can achieve up to 12 levels of interleaving without additional devices. • For proper voltage sensing, the OUTS pins of each IC should be tied together. It is worth noting that since all the error amplifiers (EAs) are involved in the control loop, the Bode plot injection needs to involve them all, too. As a result, both the sensing point (output voltage) and the OUTS pins need to be tied together to make sure even perturbation is observed for each EA.


Figure 10: Diagram showing the phase shift between each channel at each switch node


• RT pin needs a resistor to set the frequency. Te master IC should have a resistor value that sets the desired switching frequency, and each slave ICs should have a resistor value that sets its frequency 20% lower than that of the main IC.


www.electronicsworld.co.uk November 2023 25


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