DROK DCDC Buck Converter, DC 5-40V to 1.2-36V Power Supply Step Down Voltage Regulator 36V 30V 24V 12V 5V 3.3V 8A 100W Adjustable Volt Reducer Module
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Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Purchase options and add-ons
Brand | DROK |
Color | Blue |
Item Weight | 0.1 Grams |
Input Voltage | 5 Volts |
Output Voltage | 36 Volts, 5 Volts |
About this item
- PARAMETER --- input voltage 5V-40V; output voltage 1.2-36V adjustable; rated output current 8A; max output current 12A; rated power 100W.
- APPLICATION --- battery; car laptop power supply; car LED; power transformer DIY.
- PROTECTION --- short-circuit protection; over-temp protection; input reverse connection protection.
- CONVERSION RATE --- 95% max.
- LED INDICATOR --- indicates the operating status.
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Product details
- Is Discontinued By Manufacturer : No
- Item model number : 090483_JPN
- Date First Available : April 1, 2013
- Manufacturer : DROK
- ASIN : B00C4QVTNU
- Country of Origin : China
- Best Sellers Rank: #168,942 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
- #639 in Power Converters
- Customer Reviews:
Product Description
Parameters: Module properties: non-isolated step-down module (BUCK) Input voltage: DC 5-40V Output voltage: DC 1. 2-36V Output current: 12A Max(rated 8A, peak 12A); 100W(if enhance heatsink, can reach 200W) Operating temperature: -40 to +85 Celsius Working frequency: 300KHz Conversion efficiency: up to 95% Short circuit protection: Yes (limit current is 14A) Over-temperature protection: Yes (the board will automatically shut down the output if over-temperature) Input reverse polarity protection: None (please install diode at input port if you need such protection) Installation: four 3mm screws Dimension: 60x52x20mm Wiring: V-IN for input; V-OUT for output Application: For step down voltage application like battery or power transformers, DIY adjustable voltage regulator, 24V auto laptop power supply, 12v to 3. 3V or 12V to 5V or 24V to 5V or 24V to 12V, etc. Note: Please adjust the potentiometer for at least 10 circles if you need to adjust output voltage Testing for reference: Input 12V, output 5V/10A, efficiency 81% Input 12V, output 5V/6A, efficiency 86% Input 24V, output 12V/8A, efficiency 91% Input 24V, output 19V/6A, efficiency 94% Package include: 1x DCDC Buck Converter
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
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Learn more how customers reviews work on AmazonCustomers say
Customers like the performance, quality and adjustability of the power converter. For example, they mention it works well, is reliable and stable. Some appreciate the variable voltage regulator and the value for money. That said, opinions are mixed on the heat sink and current.
AI-generated from the text of customer reviews
Customers are satisfied with the performance of the power converter. They mention that it works well, it functions flawlessly in sub-zero weather, and it's a great product. Some say that it'll work without getting hot.
"...the 50k potentiometer with a digital potentiometer (8 bit) and it works beautifully, giving 100mV step resolution in my application...." Read more
"Excellent product and probably the best we've had so far.Added a cooling fan and putting it to the test! So far readings are great...." Read more
"At first the regulator worked like a dream. Needed to set the output voltage to 12 exact, and that's what I got...." Read more
"This supply worked much better than expected. I was prepared to upgrade all the capacitors but so far no issues...." Read more
Customers like the quality of the power converter. They mention it's reliable, easy to use, and does the step down conversion very well. Some say that it'll last a long time with very little problems. Overall, customers are satisfied with the quality and functionality of the product.
"...It seems very well constructed, and it is a wonder of Chinese manufacturing that it can be sold for this low price...." Read more
"...(so strong and powerful)..." Read more
"...The input/output ports are a little flimsy, however if your not constantly loosing and tightening, your fine." Read more
"who doesn't love nice control over voltage. The unit is small and nicely made, the adjustment pot doesn't have the resolution of a twenty turn pot,..." Read more
Customers like the adjustability of the power converter. They mention that it's an excellent variable voltage regulator, that needs a larger input/output connection, and that the output voltage was well-regulated. Some say that the tuning is sensitive, and the input voltage varies greatly.
"...Testing was performed with 14.2 V input. Output voltage was well-regulated, better than 0.1% for 0-3 A loads...." Read more
"All 4 of the regulators I received work well and adjusted easily...." Read more
"I received a replacement and its output voltage could not be adjusted either. I have another that i bought a year ago and it works great...." Read more
"...The input voltage varies greatly. 17-33 volts depending on how fast I pedal but the output remains a steady 14...." Read more
Customers appreciate the value of the power converter. They say it is well worth the price.
"...They work beautifully and it's DEFINITELY worth the cost not to have to worry about cobbling one together myself...." Read more
"...That being said, the price on this is not unreasonable so it might be worth the risk if you're on a budget." Read more
"...Other then that, this was well worth the price." Read more
"The quality of the circuit board and components are worth the price, it actually had a printed solder post to install a fan if needed in addition to..." Read more
Customers like the size of the power converter. They mention it's compact, easy to use, and reliable. Some say that it'll work in a +200°C test environment. Overall, most are satisfied with the size and functionality of the product.
"Brilliant compact unit for lowering the voltage.It doesn't have to be just for a car...." Read more
"who doesn't love nice control over voltage. The unit is small and nicely made, the adjustment pot doesn't have the resolution of a twenty turn pot,..." Read more
"...an important thing to note is this is pretty small and you'll need some tiny flathead and phillips drivers to tighten the connector screws and..." Read more
"This converter work just as it is supposed to, it is compact and doesnt put off much heat. I purchased 3 units...." Read more
Customers are satisfied with the stability of the power converter. They mention that it holds stable voltage for the most part, regulates perfectly down to 12 volts dc, and holds the voltage well. Customers also appreciate the large and well-attached heat sinks.
"...The wires are even held in place firmly by the screws and the voltage hasn't moved with all the jumps, bumpy off road riding etc...." Read more
"...Voltage holds stable for the most part...." Read more
"...17-33 volts depending on how fast I pedal but the output remains a steady 14. It is also nice that it has circuitry for a fan for long term usage...." Read more
"held voltage well. took a good many turns to find the adjustment" Read more
Customers are mixed about the heat sink. Some mention that it has good heat sinking, runs cool, and doesn't warm up very much. However, others say that one of the heatsinks got very hot and within a few minutes the magic smoke was there.
"...I can say that the module hardly gets warm under these conditions. Good heat sinking and decent efficiency from the on-board switcher...." Read more
"...It doesn't get hot or even warm at the bottom of my bike, probably because of the airflow and possibly the extra heat sink I added...." Read more
"...the heatsink gets up to 140F so yes it is HOT. Im not using it to charge a battery but only to supply power" Read more
"...Heating was minimal at 12V, 3A output...." Read more
Customers are mixed about the current of the power converter. Some mention that it runs continuously all day and maintains output at 14, while others say that it does not supply anywhere near the rated current and generates a lot of noise. Some say that the power is a little dirty and the regulator was only taking in less than one volt.
"...the starting battery off the generator 12 volt output the voltage gets to high and i dont want to burn the battery up...." Read more
"...Almost no current was running through the input. I tested the output to see if anything was going through.. my multimeter marked zero...." Read more
"...to a 100w solar panel (12v rated but output 19v) and it run continuously all day (so strong and powerful) until the sun went down where the fan just..." Read more
"It arrived in working condition.However, it does not supply anywhere near the rated current, and generates a LOT of noise...." Read more
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I purchased this converter as the front end regulator of a programmable bench power supply that I am building. I only need 3A maximum at 3V - 26V out of it, so I haven't tested it beyond those levels. I can say that the module hardly gets warm under these conditions. Good heat sinking and decent efficiency from the on-board switcher.
However, there seems to be some missing information as to the actual specs of the module. One place says 30V maximum input voltage, and in another in the spec says 40V max. So which is it? For the record, I'm going to be powering it from a 24Vac transformer with a full-wave rectified voltage of about 32V, so it makes a difference to me.
One reviewer thinks this uses a XL4012 buck converter, while another thinks it's an XL4015. You can't see any labels on the regulator package without desoldering several components, which I didn't want to do.
So, to try to answer these questions, I did some testing. First, using a digital oscilloscope, I measured a switching frequency of about 180kHz, with some variation under load. (The peak-to-peak noise voltage under load was about 60mV.) I also measured an on-board reference voltage at the feedback pin of 1.25V. These results rule out the XL4012 which switches at 300kHz with an on-board reference of 0.8V. (As a side note, XLSemi no longer lists the XL4012 as a product - likely it's been obsoleted.)
The XL4015 is still a candidate, however. It has the right switching frequency and reference voltage, but it's only rated for 5A continuous. However, on XLSemi's product page (http://www.xlsemi.com/product.html), they list the XL4016 which looks exactly like the spec for this DROK regulator.
If you pull up the data sheet for the XL4016 (http://www.xlsemi.com/datasheet/XL4016%20datasheet.pdf), you see:
1) It's rated for 40V input voltage (which makes me happy)
2) it's rated for 8A continuous output (with proper heat sinking)
3) it has a 180kHz switching frequency and 1.25V reference voltage
I did some further measurements on the module itself. The spec on the XL4016 says that the minimum input voltage is 8V. However, when I set the output voltage to 3.0V and drove a 2ohm load (1.5 amp output), I was able to run the input voltage down to 4.05V before the regulator started dropping out. So it does work fine at lower voltages than the 8V in the XL4016 spec, but with somewhat increased dropout voltage.
Lastly, I looked at the voltage setting resistors. The potentiometer is 50 kohm. The adjustable output voltage is set by the following equation: Vout = 1.25V *( R2/R1 + 1), where R2 is the setting of the pot, and R1 is a fixed 1.5kohm resistor (a small surface mount component located on the bottom of the board right across from the regulator feedback input pin). Of course this equation is true only if the input voltage exceeds Vout by at least the drop out voltage.
Someone commented that they want to replace the potentiometer with a digital pot. I also plan to try that. But it's not as simple as just dropping in a digital pot. Almost the full output voltage appears across the pot R2, and very few digital pots will withstand more than 5V. So you will likely blow up the digipot if you drop one in. There are some digipots out there that can withstand higher voltages, but they are surface mount components. And I personally prefer to work with through-hole components, because I don't like having to design a printed circuit board when I'm trying out new circuits for a design. There is a way, however, to use the low voltage digital pots in this kind of application. More on that later, perhaps, if people are interested.
Post Note: (3/15/15) I was able to replace the 50k potentiometer with a digital potentiometer (8 bit) and it works beautifully, giving 100mV step resolution in my application. To get around the 5V maximum voltage limitation of the digipot that I used, it required adding a few extra components - basically adding a secondary opamp feedback circuit. Pretty simple, and it is possible to increase the resolution further if needed.
Added a cooling fan and putting it to the test! So far readings are great. 14.2v input using 14 awg wire 6ft long + 1ft long -. Have device set at 5.12 volts and its peaked 14.28 amps and shut off, holds 8-9 amps perfectly. A while back I decided I wanted USB ports in my car to charge cell phones and children's electronics using USB (seems like everything is USB charged now, I like it!) And my husband did it a few months ago but had a hard time finding something that could power all those ports he installed through out the car, and he installed this little wonder as soon as it came out the mail box. And its awesome. This is the 3rd power source we've tried on it and this is it!
The tests was done using a ammeter and digital multimeter, everything we could plug in on USB and using his E-cig pass through on medium-high. And peak test was done shorting it out (simulating what it'd do in the event of a short or overload) also found the safter features of the device responded faster than a 10 amp fuse. I guess that's a good thing. So your overload/short circuit shut off may be a bit different
Excellent product DROK, we'll be ordering many, many more. We own a performance/custom Automotive business and sure we'll start offering USB power now being we've found what works great!
Thanks
I needed to cover the top of it to prevent lots of dirt and water from spraying directly into the unit from my front tire, so I decided to thermal epoxy an extra heat sink I had laying around on top of the heat sinks already on the unit. I ordered artic alumina thermal adhesive to easily join them together.
http://www.amazon.com/gp/product/B0009IQ1BU?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00
The unit will get hot without airflow at higher amps, like 8+, like if sitting out on a table without good airflow. It doesn't get hot or even warm at the bottom of my bike, probably because of the airflow and possibly the extra heat sink I added.
If you plan on really pushing this thing at high amps then I would epoxy on an extra heat sink like recommended in the description. But of course test it out first and see how hot it gets to see what you will need.
Reviewed in the United States on July 14, 2015
I needed to cover the top of it to prevent lots of dirt and water from spraying directly into the unit from my front tire, so I decided to thermal epoxy an extra heat sink I had laying around on top of the heat sinks already on the unit. I ordered artic alumina thermal adhesive to easily join them together.
http://www.amazon.com/gp/product/B0009IQ1BU?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00
The unit will get hot without airflow at higher amps, like 8+, like if sitting out on a table without good airflow. It doesn't get hot or even warm at the bottom of my bike, probably because of the airflow and possibly the extra heat sink I added.
If you plan on really pushing this thing at high amps then I would epoxy on an extra heat sink like recommended in the description. But of course test it out first and see how hot it gets to see what you will need.
Seems as if quality control on these things is hit and miss at best. But that's what you get for buying cheap parts. Lesson learned. Never again.
Top reviews from other countries
That the cause of when you tork the screw to maintain the wires in the connector, to broke that little tiny welded pins. You can scrath the bord to be able to etamed it and weld the wire directly to the board to be sure to have a good contact.
After doing all of that, i have turn on the regulator and try to adjust-it, too bad, potentiometer doesn't works at all.
The design seen to be good and to big making it attractive, but the pieces used to built-it are very poor in quality.
The just have to put a good potentiometer and put 4 of 1/8 inches welding spot instead of that el-cheapo screwed terminal.
I am very disapointed, and due to the required modifications to weld the wires directly to the board, it is not returnable.
Until they improve the design, I do not recommended that regulator.
This bad boy can handle up to 12amps! I have a Peg Parego train for the kids that I can now power with a Milwaukee M18 battery and this allows me to drop it to 6volts.