12-V LED Driver

lights up the dark nights

Supposing you’d want to bring some light into a boat or campervan during the evening you could connect a couple of 12-V incandescent lamps to the on-board battery. The disadvantage of this solution is that the battery can be drained quite quickly — incandescent lamps aren't exactly known for their energy efficiency. LED lamps fare much better in this respect, but the light fittings required for 12-volt operation are costly. So, the author set out to design a compact, but versatile driver that lets you use inexpensive 230 V LED lamps

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Materials

www.idt.com/document/dst/zled7x30-datasheet

https://en.wikipedia.org/wiki/Ground_bounce

PCB PDF

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Download Gerber file: 150314-1_12VLEDdriver_V1_1.zip

Extra info / Update

* Powered from a 12-V battery
* Suitable for efficient LED lamps
* Configurable output current up to 350 mA
* Various dimming levels via the on/off switch

Component list

From the Store
150314-1 PCB, unpopulated
Component List
Resistors
R1,R2 = 1.2Ohm * (SMD 0805, 0.25W, 1%)
Capacitors
C1 = 47µF 25V, SMD 0805, aluminum electrolytic capacitor (Panasonic EEE-FT1E470AR)
C2,C3 = 1µF 50V, X7R, SMD 0805
Inductor
L1 = 100µH SMD, 3.1A / 0.11Ohm (Würth Elektronik 7447709101)
Semiconductors
D1 = NXP PMEG3010EJ, Schottky diode 30V 1A, SMD SOD-323F
IC1 = ZLED7730, LED driver, SMD SOP-8 (IDT, ZMDI) *
Miscellaneous
PCB 150314-1
* see text

Discussion (0 comments)

DH3KC 7 years ago

Hi Elektor team and all who are interested,

I am looking to buy a ZLED7530 but it looks at least very complicated and I could see that these parts are obsolate. Does some has an idea?

Michael

0 Comment(s)

DH3KC 7 years ago

Again me,

The circuit in "Bild 1" is wrong I guess. In the datasheet Dim1 and Dim 2 are switched to GND and not like drawn to the LED+ output.
Have fun!
Michael

0 Comment(s)