Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
- super efficient
- stable, clean power
- price (?)
- requires 5V on enable Input
- not really 3A (debatable)
Bought this just because i was curious if this compact unit could be up to the job of supplying a few 5V devices with sufficient current.
I have a small "cubicle" outside that serves as a garden and i don't have electricity there. But i have a car battery in spare :)
Right now i am using a cigarette lighter plug converter that is rated at 650mA and it barely manages to supply a small MP3 player and usb powered speakers. with this one i added a battery charger, a smartphone (Samsung I9000) and a led rgb lightchain (draws rougly 100mA). all round i was drawing about 1.5A. there was no noticeable heat dissipation and the input current was about 650mA. The calculated efficiency is thus about 90%. When the enable-input is floating or set to ground, the unit draws a barely measurable current which makes it ideal for battery powered systems. I am planning to buy more of these to power hard drives in a server that has no 5V lines, powering and charging mobile devices from my spare car battery which is charged by a solar cell when camping/outside and maybe some equipment on my bicycle, that has a dynamo charged battery too :)
in a test environment i was able to draw about 2.5A. beyond that voltage dropped and began to ripple. i was using a large very low esr capacitorwith 440u.
Buy this if you need a really small, yet powerful supply. Don't expect the unit to work right away, you need to put a logic level signal (5V) on the EN-Pin to turn it on. this can be easily achieved by a large resistor (10-47k doesn't really matter) and a 5V zener diode. Some may argue about the price but i think it's fair considering i'd probably pay 5 times as much if i bought something similar around here in a shop.
Oh, and don't forget the capacitor on the output. Instead of the suggested 47uF from the datasheet, i'd recommend you not to go any lower than 220uF. What's more important: Use ONLY low or super-low ESR types! "Normal" types will get very hot or even blow up due to the intense ripple current. And if they don't they'd still waste a lot of power impacting your efficiency considerably.
Note:Stock and Availability shown on this site is for your reference only. While
we strive to provide the most accurate and timely stock and availability information,
availability information may become out of date and may change between the time
you added an item to cart and the time your order is received.
Quantities on clearance items are limited. Prices are current at time of posting. DX Reserves the right to change prices at any time without notice.