Thermally optimized architecture for switching regulators

Details Thermally optimized architecture for switching regulators Thermally optimized architecture for switching regulators

2008-12-04

2010-11-16

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

C323S283000, C323S285000, C323S299000, C323S907000

Reexamination Certificate

active

07834598

ABSTRACT:
In a preferred embodiment for use in step-down (buck) DC-DC converters that may operate, at least part of the time, at high duty cycles (>50%), the power dissipation in the high side switch is effectively monitored and the switching frequency of the converter is lowered as needed to keep the sum of the conduction losses and switching losses in the high side switch substantially constant. In another embodiment, the ideal switching frequency is approximated. In still another embodiment having the switches integrated with the controller, the die temperature is monitored, and switching frequency, output current or both are varied to limit the die temperature.

REFERENCES:
patent: 6628109 (2003-09-01), Rincon-Mora
patent: 6894465 (2005-05-01), Sutardja et al.
patent: 7298124 (2007-11-01), Kan et al.
patent: 7622904 (2009-11-01), Sutardja et al.
patent: 7646189 (2010-01-01), Chen
“LM138, LM338 5-Amp Adjustable Regulators”,National Semiconductor Corporation, (Mar. 1995), pp. 1-14.

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