CURRENT REGULATOR ASSEMBLY WITH BALLAST TRANSISTOR PROVIDED WITH AN ACCESSORY TRANSISTOR FOR LIMITING THE AVERAGE POWER DISSIPATED IN THE BALLAST TRANSISTOR

摘要

P GENERATOR ASSEMBLY OF A SUBSTANTIALLY CONSTANT AVERAGE VALUE REGULATED CURRENT FROM A RECTIFIED V-SUPPLY VOLTAGE, INCLUDING A BALLAST T TRANSISTOR POLARIZED BY A REFERENCE VOLTAGE PROVIDED BY A ZENER Z DIODE, CHARACTERIZED BY A AUXILIARY T, CONNECTED IN SERIES WITH THE BALLAST TRANSISTOR AND POLARIZED BY A VOLTAGE DIVIDER R, R CONNECTED TO THE TERMINALS OF THE SUPPLY VOLTAGE SOURCE V. APPLICATION TO THE EXCITATION OF LIGHT EMITTING DIODES. /P