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Switching power supply ICs such as industrial control equipment power supply 1 principle of using LDO

When the ripple and noise in the output voltage are required to be extremely small, the input-output voltage difference is not large. When the output current is less than 100mA, a micro-power, low-dropout (LDO) linear regulator is suitable, suitable for most portable applications. Applications

Switching power supply ICs such as industrial equipment power supply, principle 2, charge pump used when negative power supply is required

Negative power is often required in portable instruments because the current required is not too large. It is almost simple to use a charge pump IC to form a voltage inversion circuit. If low noise is required or output regulation is required, linear regulation with LDO can be used. Charge pump IC

Switching power supply IC principle such as industrial control equipment power supply 3 Do not pursue very new devices with high precision and full function

The accuracy of switching power supply ICs such as industrial control equipment power supply is generally ±2% to ±4%, and the accuracy is as high as ±0.5% to ±1%. The appropriate accuracy should be selected according to the requirements of the circuit, which can reduce the production cost. The function of the full-featured device is higher, so there is no need to turn off the power function or the microprocessor (μP) or micro-controller (μC) in the product does not need to choose to have the power off function or the output power supply. The device of the status signal, which not only reduces the cost, but also has a smaller size.

Industrial control equipment power supply and other switching power supply IC principle 4 do not "big horse car"

The main three parameters of the switching power supply IC such as the industrial control equipment power supply are the input voltage VIN, the output voltage Vo and the large output current Iomax. According to the working current of the product, it is more suitable that the working current is 70~90% of the large output current Iomax of the power IC.

Industrial control equipment power supply and other switching power supply solutions on and off a typical IC, such as: switching power supply chip TB5812A, is a digital logic control, designed for smart phone-level network products, small portable devices power supply designed high performance, PSR (source side Feedback) Single-chip switching power supply controller; built-in 700V power switch tube, the most high-power 12W, fine and accurate CV/CC (constant current / constant voltage) digital logic control circuit will be the traditional feedback loop on the optocoupler The TL431 and its related devices are omitted, and a high-performance design is adopted. A high-performance power switch tube and digital control logic circuit are integrated into one package, and various protection circuits are integrated into one body to reduce the external components. To the least, save peripheral system costs. TB5812A can be easily designed into a typical flyback switching converter. The special driving technology improves the resistance and voltage efficiency of the power tube and achieves excellent conversion energy efficiency.

Main features of TB5812A: Built-in 710V power switch PSR (source side) control mode, eliminating optocoupler, TL431 and loop devices; precise CC/CV (constant voltage / constant current) digital logic control circuit; hysteretic type (Over-temperature protection) The circuit optimized circuit improves the conversion efficiency and meets the energy efficiency of 5 levels. The SOP-7 package makes the insulation spacing of the high and low voltage PIN pins more secure. All No Load Consumpon <75mw; low electromagnetic interference (EMC) allows the use of simpler EMC circuits; rich protection circuits make the product work safer and more reliable; QR (quasi-resonant) mode of operation. TB5812 5V/2A routine test data (satisfying six energy efficiency)