1, -16 pins include output pins, synchronization pins, and brake pins Low power booster chips These pins are used to connect the output load and control the output voltage and current. Voltage 3842With a supply voltage range of 8V to 35V and an input bias current of 200nA, it is a low-power controller. The logic device used in the controller adopts CMOS technology, which has the characteristics of low power consumption, high speed and high reliability.
2, UC3842 power pin (7 pin) voltage on the threshold of 16V, off the threshold of 10V, the maximum voltage shall not exceed 34V.
3, generally between 10-30V. 7 is the power pin, and 20v is normal. In general, directly change a 3842, ensure that the mos does not break down, disconnect the gate, power, millionUse the table to test the voltage of the 6-pin swing of 3842.
4, foot: voltage feedback, about 51V Low power booster chip ; 3 pin: current detection, less than 1V; 4 pin: timing resistance-capacitance element, about 2V; 5 pin: ground; 6 pin: pulse output, 0-15V square wave; 7 pin: Power supply, about 15V; Pin 8: reference voltage, 5V.
5, is a common integrated circuit, the functions and voltage are described as follows: Pin 1: This is the 3842 power supply pin, usually connected to the positive power supply voltage. Pin 2Or reverse phase. The principle is through some MOS tube switching circuit in some capacitors constantly switch on to carry the charge, and then by the capacitor connection mode to determine the polarity and amplitude of the output voltage, all charge pump devices or devices with charge pump must be external capacitors to work normally, this is the reason.
MAX232 is a serial level conversion chip, the use of charge pump boost mode, the drive current is very small, are mA level current, not suitable for amplification drive. I don't know how much power your ultrasonic transmitter needs, so I can't recommend a suitable circuit scheme, can only giveYou provide an idea. You can consider using the effector to build an amplifier circuit, according to the voltage and current you need to choose the corresponding FET on the line.
2, AC-DC conversion chip: responsible for converting alternating current to direct current Low power booster chip , such as the aforementioned power adapter or power module used in the corePieces. DC-DC conversion chip: Includes various forms of converters, such as Buck (Buck) converter, Boost (Boost) converter, and buck-boost (Buck) converter chip.
3, this kind of chip model is TPS6108SGM4151 and so on. The TPS61085 is a high efficiency boost converter with input voltage range of 5V to 12V, output voltage range of 8V to 15V, and maximum output current of 2A, with low power consumption, high efficiency and stable output characteristics. SGM4151, the chip is a high efficiencyPower management chips for portable devices with battery powered devices as well as low power applications.
Can use LN2351 low-power booster chip chip Low-power booster chip , the current is not large directly boost low-power booster chip , the output is about 200MA. External MOS expansion when high current is required. Note the Low power consumptionThe boost chip is that if the chip is used, the BL8505 three-terminal boost voltage regulator IC, the minimum working voltage of the IC is only 0V. Output voltage range 5~0V, step by 0.1V. TO92 tripod package, appearance and 9013 triode exactly the same.
Charge pump can be used. charge pump (charge pump) is a DC-DC converter that uses capacitors as energy storage components, mostly used to produce an output voltage greater than the input voltage, or to produce a negative output voltage. The electrical efficiency of charge pump circuits is very high, about 90-95%, while electricityThe road is also fairly simple. The charge pump uses a number of switching elements to control the voltage connected to the capacitor.
There are many switching regulators of this type. Recommended NCP1400ASN33T1G, its minimum input working voltage can even be up to 0.8V (can work normally under a dry battery power supply), the maximum output current 100mA, the current consumed by itself when working is only 7μA (typical value) ~15μA (maximum value), Standby current is only 0.6μA (typical value) ~5μA (maximum value).
The mt3608 chip can be used to boost the pressure and loseThe output voltage is determined by r1 and r2, and d is the Schottky diode. The inductance is 220 inductance, which is 22 microhenes. Low voltage can be boosted. r1 or r2 can be used as an adjustable booster with adjustable resistors. If it is a fixed resistor it can be used as a fixed booster.
V is nickel-metal hydride battery can boost 3V-4V, 5V dry battery can boost 3V-4V circuit diagram.