Desktop power supply (affordable model)

Xinlong Family Bucket

Step-down part----XL4015

Boost part---XL6019

Parallel connection between two modules

The cost is super low, the overall cost should be less than 10 yuan

Suitable for power supply in daily small electronic productions

Voltage input range 4-37V

Overall module output voltage range: 1.25-60V

Current range: 5A

(It is best to be within 50V, the capacitor has a voltage resistance of 50V, and you are not afraid of explosion!!!!)

In fact, it can reach 66V, video actual test

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• QC2.0/QC3.0 deception

Add simple QC2.0/QC3.0 deception, a few simple resistors and capacitors, and diodes to achieve

• QC fast charging protocol analysis
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After powering on, the voltage on the capacitor slowly increases and reaches the turn-on voltage of the MOS tube. The voltage on DN is about 0.6V on D1.

The QC fast charging protocol is that after D+ gives a voltage of 0.6, D- gives a voltage of 0.6 after 1.25S, and the charging head outputs 12V.

This 1.25S is achieved by slowly charging the capacitor.

• Students who have the conditions can add a radiator on the chip
• For students who don’t have the conditions, you can also install the 2.2UH inductor directly with a piece of tin.

Voltage meter:

click the link--------------------

0.28-inch ultra-small digital DC voltmeter

The measurement line connection of the meter head, VOUT

Purchase from Taobao Uxin store as follows:

XL4015 chip, 1.7 yuan,           purchase link

XL6019 chip, 1.8 yuan,             purchase link

Inductor 47uH two 0.8 yuan,           purchase link

DC socket 5.5-2.1, DC3.5,                purchase link for 0.1 yuan     (depend on what input interface you have, then buy it)

SMD aluminum capacitor 50V 470UF 3 yuan,               purchase link

SMD capacitor 0.1UF 2 yuan                  purchase link

SS56 Schottky two 0.6 yuan,            purchase link

Double potentiometer two 0.8 yuan,             purchase link

So far, price 9.8

Two voltmeters, I got two for about 8 yuan. You don’t have to buy these. You can just use a multimeter to check them. It doesn’t affect the function, it just affects the experience.

0.28-inch ultra-small digital DC voltmeter

The layout was not good, so I just tried to figure it out and it worked.

If you are interested, you can make a secondary layout.

If I have time, I will revise it again