What is the function of the module power supply?
2022-08-25

For module power supply products with trim or adj (adjustable) output pins, the output voltage can be adjusted within a certain range through resistance or potentiometer, and the general adjustment range is ± 10%.

Module power supply

For the trim output pin, the center of the output potentiometer and all connections of the center trim + s, - s are in the pin module, and the other two ends are connected to + s, - s respectively. Without + s, both ends of - s respectively receive the positive and negative outputs of the corresponding main circuit (+ s connected to + VIN, - s connected to - VIN), and then adjust the potentiometer. The resistance of potentiometer is generally 5 ~ 10K Ω, which is suitable.

The adj output pin is divided into input adjustment and output adjustment. Output adjustment and output adjustment. The adjustment method of trim pin is the same. When one end of the potentiometer is connected to the center, the output voltage can only increase the output voltage, and the other end is connected to the ground of the input end.

Input protection circuit general module power supply products adopt built-in filters, which can meet the requirements of general power supply applications. If a more demanding power supply system is required, the input filter network shall be added. LC or π can be used, but attention should be paid to selecting smaller inductance and larger capacitance.

In order to prevent the transient high voltage damage of the module power supply, it is recommended that the user connect the transient absorption diode to the input terminal and cooperate with the fuse to ensure that the module is within the safe input voltage range. In order to reduce the common mode noise, it is possible to increase the high frequency capacitance of Y (CY) and generally select several capacitors NF. R is fuse, D protection diode, D transient absorption diode (p6ke Series).