40-A 16-V input, DC/DC buck converter features innovative control topology
Using an internally compensated advanced-current-mode (ACM) control topology supporting frequency synchronization, TI’s TPS543C20 SWIFT converter provides enhanced efficiency by integrating its latest generation of low resistance high- and low-side MOSFETs into a thermally efficient small-footprint package. Designers can stack two converters side by side to drive loads up to 80 A for processors in space-constrained and power-dense applications.
The internally compensated ACM control topology with fast transient response maintains stability over a wide range of input and output voltages. What makes ACM different, TI comments, is that it is an emulated peak-current-mode control topology that internally generates a ramp with the ability to dynamically adjust for stability over a wide range of operating switching frequencies. This provides the best of both traditional fixed frequency for low noise operation and constant on-time (COT) control for fast transient without external compensation. The converter can run at greater than 90% efficiency at a 40-A peak-load current; maintains 0.5% reference-voltage accuracy over temperature and full differential remote-voltage sensing to meet the voltage-accuracy requirements of deep submicron processors. It occupies TI’s PowerStack quad flat no-leads (QFN) package to aid heat sinking from the single ground pad.
It is supported TI’s WEBENCH online design tools where there is a 1V, 20A highly integrated synchronous buck converter reference design, and by the 40-A TPS543C20EVM-799 or stacked 80-A TPS543C20EVM-869 evaluation modules. In a 40-pin, 5 x 7 x 1.5-mm PowerStack QFN package it is priced at $5.24 (1000).
TI; www.ti.com/tps543c20-pr-eu.
TI has further support materials including a blog post, “Lightning-fast internally compensated ACM topology – what can it do for you?” and the “Control-Mode Quick Reference Guide” helps understand the difference between TI’s various control modes.
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