Dc Dc Constant Current Led Driver Circuit

I need help to make led medical light source.

Dc dc constant current led driver circuit. This circuit allows you to use any voltage between 2v and 24v to drive almost any type of led with power consumption up to 5w. 1 year ago. Question 1 year ago answer upvote. Sir is this circuit suitable for 9 watt and 12 watt as i want to use 9 parallel led of 1 2 watt and want to operate circuit at for 12 volt battery source led spec is 9 10 voff and 120 ma current please tell me what change is exaxtky required and lm 338 required heat sink or suggest any other good ckt for different combination like strings of 4 led 3 volt voff and 3 parallel series of this.

Mean well s ap constant current driver is a good example shown below. This is because the chemistry of a white light led sets the forward voltage at about 3v and 3 0v x 0 35a 1 watt which is a convenient led power. This way when the led s electrical characteristics change due to heat the led will stay at a safe driving current while the voltage can vary depending on the leds needs. In the constant current led driver circuit you do state that in step 6 the input voltage varies from 3 volts right up to 60 volts.

The led driver circuit uses an ncp1027 monolithic controller in a 1 amp 12 watt. This is a very simple led constant current design using only 2 transistors 2 resistors and an led. Higher current ratings do make the led brighter but if not regulated the led will draw more current than it is rated for. Introductionthe new lt1932 dc dc converter is specifically designed to provide high efficiency constant current drive for white led backlights.

To achieve the best possible brightness matching the lt1932 drives the leds in a series string which inherently guarantees current matching and therefore equal brightness among all leds in the string. These drivers vary the voltage along an electronic circuit which allows current to remain constant throughout the led system. High effi ciency 1 watt to 15 watts ac dc or dc dc constant current led driver circuit schematics free electronic circuits diagram wiring design plans schema diy projects handbook guide tutorial schematico electr nico sch matique. Most dc dc constant current led drivers are buck or stepdown converters.

This means t hat the. The lt1932 is a fixed frequency step up dc dc converter designed to operate as a constant current source. The majority of high power white leds are designed to be run at 350ma constant current.