|Item Weight||4.8 ounces|
|Product Dimensions||1.77 x 0.91 x 0.55 inches|
|Is Discontinued By Manufacturer||No|
|Manufacturer Part Number||VA-139-52|
Valefod 10 Pack DC to DC High Efficiency Voltage Regulator 3.0-40V to 1.5-35V Buck Converter DIY Power Supply Step Down Module
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- 【High Precision】The buck converter consists of 36u thickened circuit boards, high-Q inductance with output LED indicator, and superior solid-state capacitors that can effectively filter out high frequency noise. Suitable for various electronic projects.
- 【Input Voltage】DC 3V to 40V (input voltage must be 1.5V higher than the output voltage, no boost).
- 【Output Voltage】DC 1.5V to 35V voltage is continuously adjustable, maximum output current is 3A.
- 【Mini Size】45 * 23 * 14 mm (with potentiometer). 10pcs included.
- 【Easy to DIY】Connect to power source, using a mini screwdriver to increase or decrease output voltage by adjusting the screw on the blue potentiometer and monitor voltage with multimeter to get the needed voltage, clockwise to step up voltage and counterclockwise to step down voltage. (Factory default stays a high voltage, you need to contrarotate about 7-15 circles before the voltage starts ramping down, 1 circle means +/- 1V)
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- DC to DC step down module
- Thickened circuit boards
- Advanced solid-state capacitor
- Short circuit and over-temperature protection
- 100% tested, sealed in anti-static packaging
1. Input voltage must be 1.5 V higher than the output voltage, no boost
2. Do not reverse the input and output interface
3. Keep output under 2.5A and use a heat sink when for a long time working
- Type: DC-DC buck conventer
- Input voltage: DC 3V - 40V
- Output Voltage: DC 1.5V - 35V (adjustable)
- Output Current: 3A (max.)
- Conversion Efficiency: 92% (max.)
- Switching Frequency : 65KHz
- Rectification: non-synchronous rectification
- Module property: non-isolated buck module
- Operating Temperature: -45℃ to +85℃
- Load Regulation: ± 0.5%
- Voltage Regulation: ± 2.5%
- Size(L x W x H): 45*23*14mm / 1.77*0.91*0.55inch
- Weight: 14g
10x DC to DC Buck Converter Module
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I have attached 2 pictures that explains what I researched and tested with your LM2596 boards. Your board can not handle the surge of a power switch instantaneously supplying 40 vdc. The capacitors on the input are below engineering stands for rule of thumb. With capacitors you should always think double of what your operational voltage is. So if you are operating at 50 vdc, then you should use a 100 vdc capacitor. I added both an electrolytic capacitor in parallel across the input and a .5 ohm resistor on the positive input in series. With this configuration the LM2596 board powers up safely with the instantaneously supplying 40 vdc to the input reducing the initial surge that fries the LM2596. Likely you just sell these like all of the other sellers, but maybe send my email to the suppler and give them the opportunity to fix their product as it was engineered purely off of the LM2596 datasheet. So it is just a copy and paste board, not a product for real world use. I recommend it being fixed. I will reorder and send these bad ones back to you. Additionally, both holes should be the same size, one is 3mm which is normal, the other is smaller and not possible to use a 3mm screw in it. If your board is multi-layer and someone make the hole wider, your layers will be shorted out and more returns for you. Make both of the holes 3mm. It is standard, and the right way.
3 Stars, components and holes upgraded, 5 Stars.
4 stars because:
- efficiency is lower than what LM2596 should provide. I am measuring ~70% and it should be >80%. So, it does get hot for >1.5A and heatsink may be required.
- ripple at 1A is 400mV pk-pk. One 10uF ceramic and one 440uF aluminum capacitor bring the ripple down to 50mV.
For applications up to 1A and not sensitive to ripple, these are perfect. 1A to 3A: may need extra heat dissipation for continuous use.
I would definitely buy more. You cannot beat the price and they are fine for most applications.
Update, the Buck device does consume a fair amount of energy. I tested on my Dental Floss device that use the 7.2 volt RC packs. Just left the RC pack plugged in unattended and it was dead in 30 hours. So I know not to just leave the Battery plugged in unless recharging something. Took it Camping last weekend. 8 people 10 cellphones a few tablets for 3 days 2 nights. Only used up 4 of the 6 RC packs. Not a single trip to my trucks cigarette lighter was need to charge something.
And now, I have found more uses and have used three of them.
Very accurate, keeps a constant voltage. I tested this with a digital meter and scope. Tried with different loads and they seem very stable. Great for small loads and so easy to use.