Problems that should not be neglected in the application of voltage boost power supply module(3)
2022-09-08

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For  voltage boost power supply module products with trim or adj (schedulable) output pins, the output voltage can be scheduled within a certain plan through resistors or potentiometers. The general scheduling plan is ± 10%. For the trim output pin, connect the base of the potentiometer to trim. In the power module with all + s and - s pins, the other ends are connected to + s and - s respectively. If there is no + s or - s, connect both ends to the output positive and negative poles of the corresponding main circuit respectively (+ s is connected to + VIN and - s is connected to - VIN), and then adjust the potentiometer. The resistance value of the potentiometer is generally 5 ~ 10K Ω, which is suitable for comparison. The adj output pins are divided into input side scheduling and output side sections. The output side scheduling is the same as the trim pin scheduling method. The input side dispatcher can only increase the output voltage. At this moment, one end of the potentiometer is connected to the base, and the other end is connected to the ground of the input end.

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2. Input protection circuit of  voltage boost power supply module

The secondary power DC/DC converter of the communication power supply has been commercialized. The module adopts high-frequency PWM technology, the switching frequency is about 500kHz, and the power density is 5W~20W/in3. With the development of large-scale integrated circuits, the module power supply is required to be miniaturized, so it is necessary to continuously increase the switching frequency and adopt new circuit topologies. The power density of the module power supply has been greatly improved.

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General  voltage boost power supply module products have built-in filters, which can satisfy the request of general power application. It is assumed that a power supply system with a higher request is required, and an input filter network should be added. LC or π network can be selected, but smaller inductance and larger capacitance should be selected as much as possible.

In order to prevent the power module from being damaged by the transient high voltage of the input power supply, it is recommended that the user connect the transient absorption diode at the input terminal and cooperate with the fuse to ensure that the power module is within the safe input voltage plan. In order to reduce common mode noise, y (CY) capacitance can be increased, and several NF high-frequency capacitors are generally selected. R is the fuse, D1 is the protection diode, and D2 is the transient absorption diode (p6ke Series).