Increase Current on Pic's Pin.

Good day Picers

A slightly off topic question?

I've got a Component that requires about 60mA from my PIC's PIN.

I'm trying to figure out how to use a PNP Transistor as a switch to get a greater current from my circuit?

I know that if you use different resistors it will give you different current from the Emitter to the collector.

Is there a formula to determine what size resistor to use to get a specific amount of current through the transistor?

Rb = (VCC - Vbe) / (Ic/HFE) = (5-.6) / (.06 / 100 ) = 7.1666 K = 6.8K

safer to use lower value 680 ohm is a really safe one.

Thank you Steve!

VCC = Input voltage
What is Vbe, Ic, HFE?

Ic = Collector current
Vbe = voltage between Base and Emitter
HFE = Transistor gain, you'll find that one in the datasheet

Thank you!!

You didn't mention if you need to sink or source current to the device? Either way, have you considered using an N-channel (sink) or P-channel (source) MOSFET instead of a bipolar transistor?

Regards, Mike

Hi Mike

I'm using a PNP transistor to source current.

Didn't you mean use a 6.8k?