Controlling switching current regulators

摘要

A switching current regulator controls a load current flowing through a load. The switching current regulator switches a switch to an ON state after applying a regulating signal to the switch. During an integration period while the switch is in the ON state, the switching current regulator integrates an output voltage based on a sense voltage based on the load current and a reference voltage; at the end of the integration period, the switching current regulator outputs an integrated output voltage. The switching current regulator compares the integrated output voltage to a predetermined value. Based on a result of comparing the integrated output voltage and the predetermined value, the switching current regulator adjusts the regulating signal.

主权项

1. A switching current regulator comprising:
a switch for receiving a regulating signal for switching the switch to an ON/OFF state for turning on/off a load, wherein the load is a light emitting device (LED), the LED being coupled between a power supply and an inductor coupled to the switch; a sense resistor coupled to the switch, wherein the sense resistor is configured to carry a sense current based on a load current flowing through the load; an integrator coupled to the switch, wherein the integrator is configured to perform integrator operations comprising:
integrating an output voltage based on a sense voltage over the sense resistor input to a first input of the integrator and a reference voltage input to a second input of the integrator during an integration period while the switch is in the ON state; andoutputting an integrated output voltage at the end of the integration period; and a control system coupled to the integrator and the switch, wherein the control system is configured to perform control operations comprising:
comparing the integrated output voltage to a predetermined value; andadjusting the regulating signal based on a result of comparing the integrated output voltage and the predetermined value.