j13009 driver problem

MACAL

j13009 driver problem [Copy link]

Can the microcontroller port drive j13009? The circuit is shown in the figure

maychang

Assume that the power supply voltage of the microcontroller is 5V and VCC is also 5V. The I/O port is connected in series with a 38.6 kilo-ohm resistor, and the base current of the transistor is about 0.1mA or more. As long as P11 is not a 51 series microcontroller and the I/O port does not have a pull-up resistor, there will be no problem with other microcontroller ports.

maychang

I don't know what the purpose of the two capacitors in the picture is. Especially the 10uF capacitor connected to the collector of the transistor, what is the purpose?

MACAL

maychang posted on 2018-5-23 00:00 I don't know what the purpose of the two capacitors in the picture is. Especially the 10uF capacitor connected to the collector of the transistor, what is the purpose?

I am a software developer and don't know much about this. I want to make a microcontroller PWM drive 10W switching power supply, so can this picture be used?

MACAL

maychang posted on 2018-5-22 23:58 Assume that the power supply voltage of the microcontroller is 5V, and VCC is also 5V. The I/O port is connected in series with a 38.6 kilo-ohm resistor, and the base current of the transistor is about 0.1mA. As long as P11 does not...

I am a software developer and don't know much about this. I want to make a microcontroller pwm drive 10w switching power supply, so can this diagram be used?

maychang

MACAL published on 2018-5-23 00:11 I am a software developer and I don't know much about this. I want to make a 10W switching power supply driven by a single-chip microcomputer PWM, so can this diagram be used?

The single-chip microcomputer outputs a PWM signal to drive the switching power supply, so this diagram cannot be used. The power switch tube in the PWM-driven switching power supply requires that the rising and falling edges of the switch tube action are steep enough. Not to mention the low-pass filter formed by a capacitor of a few microfarads and a resistor of 5.6 kilo-ohms, even the low-pass filter formed by a 1 kilo-ohm resistor and the input capacitor of the power switch tube (distributed capacitor, not clearly shown in the figure) is enough to make the power switch tube not act fast enough.