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Motorcycle Tail Light circuit

Question asked by Steven Vivona on Jun 19, 2018

Motorcycle Taillight circuit

I have a schematic by someones design using part # MC34063ABD and I wanted to know if it is operating in current mode regulation ?

The part is powering 20 Leds 4 per string and 5 strings.

On pin 5 of chip there is zero volts all the time.

Problem is when a led string burns out the output voltage changes higher.

Attached is schematic of current original topology picture 1481,the other picture schematic 1483

is what I implemented to correct somewhat a out of control higher voltages.