CIRCUITRY FOR CURRENT REGULATED, EXTERNALLY CONTROLLED LED DRIVING

摘要

A current driver circuit for regulating a light emitting diode (LED) is disclosed. An example driver circuit uses one input node of the driver circuit for controlling both maximum brightness and dimming of an LED coupled to an output node of the driver circuit. The driver circuit supplies a reference voltage (VREF) to its input node. A microcontroller is coupled through a resistor or other resistive component to the input node of the driver circuit and provides the input current, where the input current is adjustable by the resistor value. The driver circuit is configured to drive multiple times the input current from its output node. By adjusting the resistor value the output current of the LED is adjusted. The microcontroller is configured to provide pulse width modulation (PWM). By reducing the duty cycle of the PWM waveform the dimming of the LED can be controlled.

主权项

1. A current driver circuit comprising:
an input node adapted to receive an input current; an output node adapted to drive an output current; a solid voltage (SV) module coupled to a reference voltage (VREF) and adapted to receive the VREF, the SV module coupled to the input node and configured to provides the VREF at the input node; a current receiving (CR) module coupled to the SV module and the input node, the CR module configured to drive the input current from the input node; and a current mirror (CM) module coupled to the CR module and the output node and configured to receive the input current and drive an output current that is multiple times the input current from the output node.