DATA CENTRES ANALOG DEVICES
daisy chain. Since the clock output on the CLKOUT pin is 180° out of phase with respect to the main clock of LTC7821, even numbered phases are in phase with each other, while those with odd numbers are anti-phase to the evens. A 4-phase, 1.2kW hybrid converter is shown in Figure 10. The power stage of each phase is identical to the single-phase design in Figure 3. The input voltage range is 40V to 60V and the output is 12V 11. The thermal performance is shown in Figure 12. The hot spot is 81°C at an ambient temperature of sensing is used in this design. As shown in Figure 13, current sharing is well balanced among the four phases.
Figure 10. A 4-phase, 1.2kW hybrid converter using four LTC7821s
CONCLUSION The LTC7821 is a peak current-mode hybrid converter controller that enables an innovative, implementation in data centres and telecom systems. All switches in a hybrid converter see switching related losses in high input/output voltage applications.
Because of this, a hybrid converter can run at 2× to 3× higher switching frequency than a buck converter can be easily scaled for higher current applications. Lower overall cost and easy scalability differentiate hybrid converters from traditional isolated bus converters.
Figure 12. Thermograph of the multiphase converter shown in Figure 9 18 September 2024 Irish Manufacturing
Figure 13. Current sharing for the multiphase converter shown in Figure 9
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