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Why does L7805CV reach 80Â°C while the resistor reach 40-50Â

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Chuoi

Joined: 11 Nov 2016
Posts: 3

Posted: Thu Jun 15, 2017 1:00 am Post subject: Why does L7805CV reach 80Â°C while the resistor reach 40-50Â

I have made a circuit that is meant to control 12V LED Strips using a WS2803 Chip. The problem I am having is that the L7805CV regulator(datasheet: http://www.kynix.com/uploadfiles/pdf0125/L7805CV.pdf ) reaches 80Â°C while the 1k resistor bank reaches 40-50Â°C.



Because of the nature of the WS2803 chip being a current sink this is the only combination of parts I could find that would work to switch LED Strips.



The circuit: each channel has a 1k pull up that has a transistor connected to it, that transistor feeds a 390ohm pullup that goes to a final transistor that works with the LED Strips. All pullups go to a 5V line provided by the regulator from 12V.

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