[Support] Correct selection of LED constant current source peripheral components

November 21, 2024

In order to maintain strict hysteresis current control when designing the LED constant current source, the inductance must be large enough to ensure that energy can be supplied to the load during HO and ON, and the load current is not significantly reduced, resulting in the average current falling below the expected value.

First, let's look at the effect of the inductor. Suppose there is no output capacitor (COUT), so the load current and the inductor current are exactly the same, which can more clearly explain the effect of the inductor. The figure below shows the effect of the inductance value on the frequency over the range of the input voltage. It can be seen that the input voltage has a great influence on the frequency, and the inductance value has a great influence on the frequency reduction when the input low voltage. (Note: It is not necessarily the same as the reference picture, but it is only a description of the problem)

[Support] Correct selection of LED constant current source peripheral components

The figure above shows the frequency response at different inductance values. The figure below shows that the load current changes significantly in the range of input voltage variation when the inductance is reduced.

[Support] Correct selection of LED constant current source peripheral components

The figure below shows the variation of the frequency according to different output voltages and different inductance values.

[Support] Correct selection of LED constant current source peripheral components

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*Electrical Characteristitics:
Current Rating;0.5A.
Withstanding Voltage:AC500V r.m.s.
Insulation Resistance:1000Megohms Minimum at DC 500V
Contact Resistance:100Miliohms Maximum.
*Mechanical Characteristics:
Mating Cyeles:5000 Insertions.
*Environmwntal:
Operating Temperture:-40°To+60°
*Material:
1.Housing:HI-Temp plastic UL 94V-0 Rated.
2.Contact:Copper Alloy.
3.Shell:SUS.
*Finish :
1u" Gold plated on conatct area,1u" Gold plated on
solder tails, Base Nickel :50u"Min
*Packing:

Number of connectors:750Pcs/REEL

Card slot connector

MATERIAL&FINISH
Insulator:PBT Glass Fiber(UL94V-0)
contact:Brass
Contact:Gold-Plated Over Nickel
SPECIFICATIONS
Current Rating:1A AC,DC
Voltage Rating:250V AC,DC
Temperature Range:-40℃ To+105℃
Contact Resistance:20mΩMin
Insulation Resistance:1000MΩ Min
Withstanding Voltage:500V AC/Min





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