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Hello All!
I have a CF745 which I checked that its datasheet say as "Eeprom based microcontroller 16C5x series". Please tell me how to programmer this and what pinout to interface with programmer. I used Falsh based microcontroller which is programmed by ICSP via Pickit2. Do 16C5x work with...
The intended output voltage is 12V. When ouput voltage reach to 13V, through divider resistor circuit, TL431 will conduct, that cause feedback signal to UC3842. When ouput voltage below 13V, TL431 will not conduct and no signal to UC3842. However, output voltage raise to 18V
Oh! In practice I fixed with ground connection. If the first scheme is right, how to reduce the voltage at bias and secondary winding meanwhile I calculated tunrs for each winding as equation. I wonder that if smps work at CCM mode. How to check a smps work at DCM or CCM mode? Please help me
Hello!
I am making a flyback transformer with input 33V output 12V using UC3842. So my flyback transformer have 3 winding: Primary, secondary, bias
Volt bias = 18V (UC3842) + 1V (diode FR207) = 19V. I choose 20V
I choose Te=0.5, inferred that Ns=Te * 12V = 6 Turns...
Unfortunately, I don't have oscilloscope. So it is difficult to design a smps. Actually, I only want to design a smps 12V 1A from 110-220VAC inut to supply for IC 4046 and LM324 working. Beside, smps must stop working at the mains below 90VAC. So I choose UC3842.
Mosfet can not turn on and off saturation because duty cycle max is about 45%, so Voltage at gate mosfet is 45%*16V (Vcc of UC3842) = 7.2V. Mosfet turn on saturation at 10V
Hello!
I am a newbie in smps, I making a smps with input 33VDC, output 12VDC 1A using UC3842. It work but there are some problem:
- The mosfet, and diode D1 overheat. I dont understand what happen. Please explain to me. This is schematic
The flyback transformer use EE25 with air-gap 0.25mm...
Hi everyone!
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I am doing a report about wireless sensor network. My teacher's request is we have to complete a report in which have install, experience, maintainence, anti noise of wireless sensor. I tried to search via internet but It is result nothing. So pls help me. Thanks so much
Hi every body!
I am a newbie in SMPS but i would like to make own a SMPS for my fan and project. I read the book "Practice switching power supply" but i don't understand because it so long and my english is too bad.
I can fix this with linear transformer but it is too big and weight.
So...
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