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wagiminator / ATtiny85-USB-C-Tester

Simple USB-C Power Delivery Tester
https://oshwlab.com/wagiminator/attiny85-usb-c-tester
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Dropout voltage of 78l05 #1

Open jxltom opened 3 years ago

jxltom commented 3 years ago

The dropout voltage of 78l05 is 1.7v, so I'm curious will the circuit work when input voltage is also 5v from usb?

The input is 5v and 78l05's output is also 5v. From my understanding, the LDO won't work in this circumstance.

wagiminator commented 2 years ago

If the input voltage of the 78L05 is 5V, then the output voltage is 5V - 1.7V = 3.3V. All the components used (ATtiny, INA219, OLED) work with 3.3V without any problems.