LP3906, manufactured by National Semiconductor, is a versatile, programmable deviceProcess power management chip. MPCI873Q is a power management chip manufactured by Freescale Semiconductor.
SC5832 is a domestic SOT23-5 small package high-current synchronous 2A chip. A metal-oxide-semiconductor field-effect transistor (MOSFET) with very low RDS internal resistance of 80 ho. The input operating voltage is 5V to 5V, and the output voltage is 0.6V and adjustable to 5V. The continuous load current output of 2A can ensure the stable operation of the system in all states. Its efficiency is as high as 94%, meeting the increasing energy saving and long-lasting operation of each systemThe requirements of.
Use switching power supply chip LM2576HVT-5 (with 5-pin patch) with only 5 devices, 2 input and output filter capacitors, a Schottky diode, and an inductor (with patch inductor, note the power capacity). Just use LDO for the rest.
The SC2463 offers a wide input voltage range from 4.5V to 30V, with two switching converters that can be set up to 700 kHz switching frequency, providing up to 15A output current and down to 0.5V output voltage. It also provides two positive output voltage linear regulators. Chip TSS0The P28 small package greatly reduces the board area. The SC2463 has two heterophase buck switching converters that reduce input current ripple, allowing less input capacitance to be used.
LDO: low voltage difference linear regulator. With low voltage difference, low noise, high PSRR, low static current (Iq), low cost characteristics, can provide stable output, the output allows the use of ultra-small capacitors. DC/DC: indicates the DC-DC conversion module. It can be used for conversion between DC power supply and DC power supply. Specifically: the DC/DC converter generally consists of a control chip, a pole coil, and twoChip recommendation
V to 8V, using LDO efficiency is too low, please recommend DC-DC mode chip ISL6227 or 6539, dual output. Also connect an external IC (FDS 6912), the output voltage is stable.
DC/DC refers to a device that converts electrical energy of one voltage value into electrical energy of another voltage value in a direct current circuit.
The power chip is more famous is the Lint and LM these two, to 20A output, there are LM5116, LT3763, etc., you log in to their website, and then find the power controllerIn the buck type, the above list has voltage, current, price and other parameters. Personally feel that the lm power supply is not very good to adjust, the ripple is large, easy to hiccup.
SX1308, a high-performance sharpe designed for small, low-power applications, offers unprecedented flexibility in your circuitry thanks to its compact 6-pin SOT23 package. The operating frequency is locked at 2MHz, allowing you to easily integrate low-cost capacitors and inductors with a height of only 2mm to maximize space utilization.
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. Turning on the switch causes current to flow through the diode to the output capacitor.
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 control the PWM output signal dutyCompare. Temperature protection: When the temperature is higher than the limit value, the chip stops working. Current limiting protection: If the current on the resistor of the current comparator is too large, the output will be reduced until it exceeds the lower limit threshold, and the power chip will burp.
en is enable. If the chip does not work without connection, an external switch can be used for control. vcc is the power supply, fb is the feedback, gnd is the ground, and lx is the output. oc is not sure, the figure is connected to 10k to the ground, depending on the definition of the datasheet.
It is recommended that you choose NCP1400ASN50, which is a boost type switching regulatorThe input voltage range is 0.8V~ 5V, the output voltage is a constant 5V, and the maximum output current is 100mA.
DC-DC booster circuit The DC-DC booster circuit of the charger uses the MAX1771 chip, which can maximize the release of lithium core energy, whether it is a mobile phone, a tablet or a camera, it can provide you with stable power. The function expansion circuit of the charging bank can provide you with night lighting, security alarms, mosquito repellent functions and other one-stop solutions to your outdoor needs, so that you are more at ease in outdoor activities.
Your input is sometimes lower than your output, so use a boost DCDC. If you do not consider the efficiency problem, you can boost the voltage first, increase the input 10-15v to 18v, and then reduce the voltage through the dcdc to the 15v you need. It's the easiest way to do it, but it's less efficient.
The most common DC-DC buck converters are those that work on the switchMode, which works as follows: First, the current is input into the inductor through a switching component (such as a MOSFET). When the switching component is turned on, the inductance will increase its flux, creating a high-voltage difference in voltage. This voltage is then fed into a rectifier (such as a diode) for rectification. Finally, the voltage is input into the output capacitor for voltage regulation, and the output voltage after voltage reduction is obtained.
DC 15V step-down for 12V There are mainly the following methods: 1】 Series diode step-down series of 4 rectifier diodes: Vcc=15-4×0.7=12V Advantages: simple line, takeWood is easy. High output current. Disadvantages: Output voltage is directly affected by power supply voltage fluctuations.
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. Turning on the switch causes current to flow through the diode to the output capacitor.
Add a DC step-down voltage regulator, such as a linear regulator or step-down switching power supply circuit.
7812 is a little reluctant, its minimum instability voltage is 3V, that is, the minimum input voltage can not be lower than 15V, otherwise it can not work normally, which is not even a little room. If the output current does not exceed 100mA, 78L12 is recommended, and its minimum instability voltage is 7V. The voltage reduction with resistance is not good, so the output voltage stability is not good, and the output voltage will fluctuate with the change of the load current.
The original imported LM2594 (0.5A), LM2595 (1A) and LM2596 (3A) have been used in the products, which are very stable in performance, and there are also domestic ones, which are worse.
It is recommended that you choose NCP1400ASN50, the input voltage range of this boost type switching regulator is 0.8V~ 5V, the output voltage is a constant 5V, the maximum output current is 100mA.
Input working voltage wide to5V to 5V, output voltage 0.6V adjustable to 5V. The continuous load current output of 2A can ensure the stable operation of the system in all states. Its efficiency is as high as 94%, meeting the increasing requirements of energy saving and long-lasting operation of each system. The internal oscillation frequency is as high as 1MHz, which can miniaturize the peripheral capacitance and inductance of the chip, so as to meet the application needs of smaller and smaller electronic products.
With 12V reduced 5 V, and the output is nearly 10A, 12V power output current must be greater than 10A. With 7805 three-terminal voltage regulator maximum output 3A, and then use high-frequency high-power composite pipe and connect, outputThe current can meet the requirements.
The 24v DC can be reduced by 7815 and input the following circuit to try, noting that the voltage only applies to the -5v part can not be shared with other parts.
If the output current is small, the linear regulator 7815 and 7805 is the most simple and effective solution, the components are easy to buy, the cost is low, the circuit is simple, and the output ripple is small. But if the output current is large, in such a case of large input and output pressure difference with a linear regulator, the conversion efficiency is low, the regulator will heat or even hot so that burned, it is best to use a switching regulator,For example, LM2576-15 and LM2576-5 are commonly used.