SINGLE PIN CONTROL OF BIPOLAR JUNCTION TRANSISTOR (BJT)-BASED POWER STAGE

摘要

A power stage for light emitting diode (LED)-based light bulbs may include a bipolar junction transistor (BJT). The base of BJT switch may be biased externally and the operation of the BJT may be through a single pin to the emitter of the BJT. A controller integrated circuit (IC) may control the power stage through the main BJT's emitter pin in an emitter-controlled BJT-based power stage. The emitter-controlled BJT-based power stage may replace the conventional buck-boost power stage topology. For example, the controller may activate and deactivate a switch coupling the BJT's emitter to ground. A power supply for the controller IC may be charged from a reverse recovery of charge from the BJT, and the reverse recovery controlled by the controller IC.

主权项

1. An apparatus, comprising:
an integrated circuit (IC) configured to couple to a bipolar junction transistor (BJT) through a single pin that is configured to couple to an emitter of the bipolar junction transistor (BJT), wherein the integrated circuit (IC) comprises:
a switch configured to couple to the emitter of the bipolar junction transistor (BJT); anda controller coupled to the switch and configured to control delivery of power to a load by operating the switch and configured to sense a current through the bipolar junction transistor (BJT).