1, Improve on your basis, DAC output do not connect to the 2596 pin 4, but the original feedback resistance (the grounded one) and ground disconnect, and then string into a resistor, DAC output connected to the upper end of this resistor. The purpose of this is not to interfere with the original feedback mechanism, which is equivalent to "pad" the potential of the feedback pin.
2. The schematic diagram of the adjustable power module of the LM2596 is as follows: Input filtered powerCircuit: 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.
3, just have a LM2596 adjustable voltage step-down module, only costs 3 yuan, and free shipping benefits. Power supply removal is fairly simple, just unscrew two screws.
1, you requestedThe schematic diagram of the LM2596 tunable power module contains several key components, which are detailed below: Input filter circuit: The pi-type filter network composed of CLC2 and C3 is designed to reduce electromagnetic interference and clutter from the input power supply, while preventing the high-frequency noise generated by the power supply from interfering with the grid in reverse.
2, the output of the output voltage division resistance network is compared with the internal reference voltage regulator value of 23V, if the voltage is deviated, the amplifier can be used to control the output duty ratio of the internal oscillator, so that the output voltage is stable. The right picture shows the pin diagram of LM2596 chip.
, what are the 5 pinsLM2596S ON/OFF pin for the control input end pin, connected to the common end (is the so-called ground), the voltage regulator circuit works; When high voltage is connected, the voltage regulator circuit stops. Therefore, the ON/OFF pin of the LM2596S is connected to a low level (ground) to work normally.
The target below is very clear, LM2596, half of the switching power supply chip. VDD50 is a power supply terminal, which by name should stand for 0V digital power supply.
GROUND is the ground foot. The feet (OUTPUT) is the output pin. The low level of the pin output is 5V, and the output feed current (average) is 200mA. The output high level is 15V, and the output source current voltage can reach 30V. Pin (VCC) is the power supply voltage pin.
1, LM2576 internal high-frequency oscillator, high frequency current switch, and output voltage sampling and comparison controller. The voltage sampling circuit samples and compares the voltage at both ends of the capacitor, and adjusts the on-off time of the current switch according to the results of the comparison, which is PWM (pulse width adjustment).
2, LM2576 switching frequency 52K, LM2596 is 150K. The high frequency means that the requirements for inductance capacitance are reduced, which also reduces the requirements for device volume. After all, the 100uH, 1000uF parameters of the LM2576 are no joke.
3, LM2596 is the second generation switchRegulated power supply, switching frequency up to 150KHz, so the filter inductance and output capacitance can be achieved a little smaller.
4, the larger the capacitance, the more time it takes to fill the capacitor; The larger the inductance, the longer it takes the capacitor to charge the inductance. Therefore, the higher the signal frequency, the smaller the parameter value of the resonant circuit. 5, in theory, the higher the switching frequency, the smaller the volume of the switching power supply, the lower the cost of the filter circuit is required. However, due to the characteristics of the magnetic equipment, the parasitic parameters of the device, after the switching frequency is increased, the impact of parasitic capacitance and inductance will be more and more largeThe switching frequency is increased.
In order to adjust and stabilize the output voltage when using the LM2596 chip, we need to connect two important pins: the adjustment pin (ADJ) and the feedback pin (FB). When the chip output voltage needs to be set, we can adjust it by connecting a resistor between the adjustment pin and the anchor pin.
The right figure is the schematic diagram of the LM2596 chip pin. 1 is VIN, 2 is out put, 3 is gnd, and 4 is feed back, 5 is on/off.
LM2596S ON/OFF pin for the control input pin, connected to the common end (is the so-called ground), the voltage regulator circuit works; When high voltage is connected, the voltage regulator circuit stops. Therefore, the ON/OFF pin of the LM2596S is connected to a low level (ground) to work normally.
LM2596 works normally when connected to low power. When connected to high power, LM2596 has no output and is usually directly grounded. Pin 4 is the input end of the feedback control signal, and is connected to the middle connection point of the proportional resistance, where the voltage is proportional to the actual output. On the otherIn addition, there is no fixed output voltage model of LM2596, all of which are adjustable output.
Use LM2596T-12 to connect a 7806 three-terminal regulator block at the positive 12v output end, output positive 6v voltage, connect a 7906 three-terminal regulator block at the negative 12 output end, output negative 6v voltage. Output voltage 12v, 3A.
1, proteus does not have this thing, how to find?Just a stabilizer? Replace it with something else. The simplest way is to add a power terminal, and input as much voltage as you need. It's a simulation? It's not a real thing.
2, P-PJ1 interface is the interface pin for external 8v power input. Input for lm2956. The DC-DC function is to isolate the 5V converted by LM2956 into a special 5V through DC-DC, and this isolated 5v is converted into 3v to supply power to stm32.
3, LM016L 2 row 16 column LCD can display 216 columns of English characters, 8-bit data bus D0-D7, RS, R/W, EN three control ports (a total of 14 lines), the working voltage is 5V.