Switching power supply integrated circuit is the main control chip of switching power supply, as long as a small number of external components, it can constitute switching power supply.
Switching power supply chip is an integrated circuit used to control the power switch. The working principle is to realize the switching and adjusting of the power supply by controlling the conduction and cutoff of the switching tube. When the input voltage is converted into the desired output voltage through the transformer or DC-DC converter, the switching power supply chip will control the switching tube according to the change of the output voltageConduction time, so as to achieve a stable adjustment of the output voltage.
As the name suggests, switching power supply is the use of electronic switching devices (such as transistors, field effect transistors, thyristors, etc.), through the control circuit, the electronic switching device constantly "on" and "off", so that the electronic switching device pulse modulation of the input voltage, so as to achieve DC/AC, DC/DC voltage conversion, And the output voltage can be adjusted automatically.
What is a switching power supply? Switching power supply is the use of electronic switching devices such as transistors, field effect tubes, thyristors, etc., through the control circuit,The electronic switching device is constantly "on" and "off", so that the electronic switching device pulse modulates the input voltage, so as to achieve DC/AC, DC/DC voltage conversion, and the output voltage can be adjusted automatically.
What is an integrated circuit? It is those small black blocks on the circuit board, there are many pins, it is not complicated inside, it is nothing more than some transistors combined together, that is all.
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Specific applications can be selected according to needs: LM2596 adjustable voltage type, LM2596-5V, LM2596-3 constant voltage output type. To obtain 8V output voltage, please use figure A, to obtain 3V, 5V output voltage, please use figure B.
This is a schematic diagram of a DC-DC conversion circuit for LM2596-5. It is a 5V fixed voltage version of the LM2596 series. The built-in resistance divider is directly connected with pin 4, and the peripheral voltage output terminal is directly connected to the output terminal voltageSample. In the actual design, it is necessary to pay attention to the heat dissipation of the IC, and the large current path should be as short and thick as possible. The inductor L should also be as close to the output of the IC as possible.
As shown in the figure, L1 is replaced with 100uh inductance, and the resistance value of R1/R2 is adjusted according to the following formula, where Vref=235. The following type of inductance will do. You can also refer to the following figure: Note that this figure is the output of 5v parameters, need to adjust the value of R1 and R2 to set the output voltage. Pure hand play, please accept.
The schematic diagram of the adjustable power module of the LM2596 is as follows: Input filteringCircuit: The double π filter network composed of CLCC3 is mainly to suppress the electromagnetic noise and clutter signal of the input power supply to prevent interference with the power supply, but also to prevent the high-frequency clutter generated by the power supply itself from interfering with the power grid. Charge the C5 when the power is turned on. Microelectronic technology is used to assemble small surface-mounted integrated circuits and micro-electronic components into one.