All Zilker chips include a proprietary bus that allows multiple chips to be synchronized and operated in parallel (Fig. 5). Parallel operation helps optimize efficiency at higher loads, but the higher losses associated with switching more components can result in lower efficiency when the load current is reduced.

The ZL2006 and ZL2004 add the ability to automatically shed phases in response to drops in load current. The dropped phases can then be re-enabled when the load current is again increased. And like other chips, the ZL2006 and ZL2004 can reduce their operating frequency within a pre-defined range due to load current changes.

Uniquely, the new Zilker POLs provide what the company calls adaptive compensation. It’s necessary to compensate a regulator’s control loop to get the optimum tradeoff between fast transient response and stability across the operating range. The new chips can dynamically modify the loop-compensation coefficients in response to varying load conditions, without a need for external components to set or vary the loop compensation.

ACKNOWLEDGEMENT
For the latest on regulations, I am indebted to power-industry guru Lazar Rozenblat for his recent blog at http://smps-power.blogspot.com, “Power Supply Efficiency Increase: Requirements and Trends.”

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