Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1998-10-27
2000-03-07
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323285, 363 15, 363 79, G05F 140, H02J 100
Patent
active
060345179
ABSTRACT:
The present invention relates to circuits and methods for improving the efficiency of step down switching regulators converting a high input voltage to a low output voltage. Furthermore, the present invention relates to circuits and methods to achieve such efficiency improvements while maintaining controllability during light output load conditions. In a preferred embodiment, the current mode switching regulator circuit includes a logic section, an output switch section controlled by the logic section, an oscillator for providing periodic timing signals to the logic section to turn the output switch ON, a feedback amplifier for developing an integrated error signal based on the output voltage, and a current comparator including an output, the current comparator for comparing the integrated error signal to the instantaneous value of the current in the output switch, the output of the comparator producing a signal which causes the logic section to turn the output switch OFF. Additionally, the output switch section is capable of delivering relatively faster voltage transitions under higher load conditions to minimize AC switching losses, and delivering relatively slower voltage transitions under lower load conditions to maintain controllability. A comparator circuit monitors load conditions via the current mode setpoint to determine proper output switch section operating mode.
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Linear Technology, Wide Input Range, High Efficiency, Step-Down Switching Regulator, LT1676 Prerelease (Apr. 1998).
Linear Technology, Application Note 19, LT1070 Design Manual (Jun. 1986).
Linear Technology Corporation
Morris Robert W.
Tuma Garry J.
Vu Bao Q.
Wong Peter S.
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