Toko, Inc.

Troy J Littlefield

Fernando Ramon Martin-Lopez

Dan Fleming

Gabe C Gavrila

An offline trim circuit includes one or more irreversible trim elements, such as fuses, for example, used for setting electrical parameters to desired values. Associated circuitry is employed to verify the effect of trimming, prior to permanently setting trim bit values, permitting the optimal definition of the trim bit sequence and completely eliminating guesswork from the trimming procedure.

Method and circuits for performing offline circuit trimming

A switching circuit is provided for converting a DC voltage to an AC voltage required for driving an electroluminescent lamp. The switching circuit charges and discharges the electroluminescent lamp with a substantially constant current to thereby reduce peak currents and extend lamp life. A constant current discharge feature of the switching circuit results in a significant reduction in current consumption.

DC to AC switching circuit for driving an electroluminescent lamp

A dual-threshold voltage comparator circuit utilizes a single input pin of an integrated circuit and an external resistor network. Appropriate selection of the resistors comprising the resistor network permits independent setting of the dual thresholds of the comparator.

Dual-threshold comparator circuit utilizing a single input pin

An EL lamp driver employs constant power regulation rather than pulse frequency modulation to thereby eliminate the high voltage resistive divider network present in prior art EL lamp drivers that employ pulse frequency modulation.

Circuit and method for directly regulating the output voltage of an

A controller circuit for controlling and continuously varying the average value of discontinuous current pulses in a step down switching regulator operating in discontinuous conduction mode effects improvements in efficiency and output ripple of the switching regulator.

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Colorado Springs, CO, United States of America

Troy J Littlefield