V-2V boost to 12V2A, the pressure difference is relatively large, it is recommended not to directly boost the pressure. Domestic chip XL6007 can try. Check out TI's webench tool. Figure 1 shows a simplified inductive DC-DC converter circuit where closing the switch causes an increase in current through the inductor.
Error amplifier: The role of the error amplifier is to amplify the difference between the feedback voltage (FB pin voltage) and the reference voltage, and then use the signal to controlDuty cycle of PWM output signal. Temperature protection: When the temperature is higher than the limit value, the chip stops working.
This paper introduces a kind of DC-DC booster switching power supply circuit based on TL494. The circuit uses TL494 power supply control chip and its peripheral circuit to generate PWM wave, and controls the on-time of switching tube through the duty cycle of PWM wave to achieve stable output of different voltages.
1, the DC/DC power chip is mainly through the feedback voltage and the internal reference voltage comparison, so as to adjust the duty cycle of the MOS tube drive waveform, to ensure the stability of the output voltage. Synchronous rectification technology Because there will be some tube voltage drop when the diode is switched on, the power consumed by the continuous current diode will become the main power consumption of the DC/DC power supply, which seriously limits the efficiency improvement of the DC/DC power supply chip.
2, in-depth analysis: DC/DC converter cornerstone and core working principle DC/DC converter, this electronic magician, the company will direct currentIn such a way that each transistor can be on, off, or carry data. Simple chips can use only one layer, but complex chips often have many layers, and this process is repeated over and over again, and the different layers can be connected by opening a window. This is similar to the production principle of multi-layer PCB board.
2, TPS60310, a charge pump booster device, the minimum input voltage of 0.9V, output voltage of 3V, the maximum output current of 20mA.
3, this chip is cheap and very practical low cost DC/DC converter 34063 application 34063 Because the price is cheap, the peak current of the switch is 5A, the circuit is simple and the efficiency meets the general requirements, so it is widely used. In ADSL applications, the switching frequency of 34063 has a great impact on the transmission rate, which needs to be carefully considered in the selection of components and PCB design.
4, MC3463 can be boosted or reduced voltage, boost the output is higher than 40V, the current can reach 5A, the working oscillation frequency is 100Hz~100KHz. MAX1606 Input 5V output 28V. MAX1642/1643 Input 1V output 10V. In order toThe above are all DC-DC chips.
5, DC booster chip usually has PWM, PWF and charge pump three. Recommend a DC-DC device CS5171 or CS5173, the input voltage range of the model device is 7V~30V, it can achieve boost, buck and reverse phase, but also can achieve symmetrical positive and negative dual power output, output voltage range 28V~40V, maximum output current 5A, SO-8 package.