초록 ▼

A pulse width modulation driver provides programmable current control for a variety of load current ranges using a modulation feedback block. The block scales a signal representative of a sensed current flowing through the load by a selectable gain multiplier. The scaled signal is compared to a targ

A pulse width modulation driver provides programmable current control for a variety of load current ranges using a modulation feedback block. The block scales a signal representative of a sensed current flowing through the load by a selectable gain multiplier. The scaled signal is compared to a target current value to indicate to a driver control when to generate trigger signals for switching current through the load. In this way, load currents can be amplified to match the operational range of the comparator.

대표청구항 ▼

[ What is claimed is:] [1.] A driver for producing a desired pulse width modulated current through a load, comprising:a target generator for supplying a target current value;a modulation feedback block havinga gain block for scaling a signal representative of a sensed current flowing through the loa

[ What is claimed is:] [1.] A driver for producing a desired pulse width modulated current through a load, comprising:a target generator for supplying a target current value;a modulation feedback block havinga gain block for scaling a signal representative of a sensed current flowing through the load by a gain multipliers to generate a plurality of scaled signals, andmeans for selecting one among said sensed and said plurality of scaled signals;a comparator for comparing said selected signal to said target current value; anda driver control for selectively generating trigger signals to switch current through the load in response to the result of said comparison.