Uc3843 24v 3a11/30/2022 ![]() if we decrease the R5 value to 820R or 680R, then the maximum output voltage would be around 32V to 33V or 39V to 40V. So as it is clear when R5 is 1K, then the maximum output voltage is somewhere between 27V to 28V. ![]() The output voltage is determined using this formula: ![]() ![]() You can increase the output voltage level by decreasing the R5 value. R1 is a 10K multiturn potentiometer that you can set to adjust the output voltage. A single-chip buck/boost controller is less noisy, however, the output voltage and current of these controllers are limited. Usually, a boost converter output is noisier than a buck converter, especially by using discrete components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, a high gain error amplifier, a current sensing comparator, and a high current totem-pole output for driving a Power MOSFET.”Ĭ3, C4, C5, C6, and C7 are used to reduce the output noise. They are specially designed for Off-Line and DC to DC converter applications with minimum external components. According to the UC3943 datasheet: “The UC3842/UC3843/UC3844/UC3845 are fixed frequency current-mode PWM controller. IC1 is the controller of the boost converter circuit. So, these characteristics make these components a good fit for this project. The ON resistance (RDS(ON)) of the Mosfet is just around 28 milliohm and it can handle up to 50A at 25C. D1 is the MBR20100CT Schottky diode (two parallel diodes in one package). L1, D1, and Q1 build a boost conversion network. Schematic diagram of the UC3843 DC to DC boost converterĬ1 and C2 have been used to reduce the input noises. As it is clear, the heart of the circuit is the UC3843 chip. Output Voltage: 28Vmax (can be increased, see the text)įigure 1 shows the schematic diagram of the DC to DC boost converter. Also, I examined the noise figure of the circuit using the Siglent SDS2102X Plus/SDS1104X-E oscilloscope and Siglent SDM3045X multimeter. The PCBs have been fabricated by the PCBWay in the green solder mask. I used Altium Designer 21 and SamacSys component libraries to design the schematic and PCB. ![]() The input voltage could be as low as 9V that makes it suitable for a variety of applications, such as 12V to 18V conversion to power a laptop computer using a single 12V battery. In this article/video, I used there major components such as the famous UC3843 chip, a power Schottky diode, and an N-Channel Mosfet to design a compact DC to DC boost converter. There are three major types of non-isolated DC to DC converters: buck, boost, and buck-boost. DC to DC converters are quite popular among electronic enthusiasts and are widely used within the industry. ![]()
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