Hello, I am feeling totally dumb asking help but I have made already a mistake buying wrong component so I would like to ask some advice.
I am driving some laser modules using a PWM 16-channel driver.
Laser modules are: output: 5-10mw, working voltage: 4.5-4.8vdc, working current: 40mA.
I am using the the PWM output from each channel to drive a N-mosfet (2SK4017) with a 10K resistor. Voltage at gate-source is around 3.3V.
I wanted to miniaturize this circuitry and bought some 2N7002 but emitting light is really weak and mosfet is getting very hot. Maybe I can try another resistor value? However when I put my finger on it and on the laser module pot at same time, light gets stronger. Some impedance I can't understand well right now.
I am using SOT23 package.
This is my first option. Any recommendation or advice?
first option
I am driving some laser modules using a PWM 16-channel driver.
Laser modules are: output: 5-10mw, working voltage: 4.5-4.8vdc, working current: 40mA.
I am using the the PWM output from each channel to drive a N-mosfet (2SK4017) with a 10K resistor. Voltage at gate-source is around 3.3V.
I wanted to miniaturize this circuitry and bought some 2N7002 but emitting light is really weak and mosfet is getting very hot. Maybe I can try another resistor value? However when I put my finger on it and on the laser module pot at same time, light gets stronger. Some impedance I can't understand well right now.
I am using SOT23 package.
This is my first option. Any recommendation or advice?
first option