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What do you think of that? I will try when I'll have time and probably come back here. Then, relative to negative ground, Vi will be higher. I finally figured that I can add some 100 Ω resistor between collector and + source. Unfortunately, the lamp PCB provides no 5V (and forces LEDs on - ground side). Your advice: use fig 39 with a separate 5V Vi. So, Fig 38 "limiter" should be called instead "Vi≥5 current limiter" which is not my case. So, the best was to try R1 values and that took me here, thanks for your answers.
Vce designer 2.2.3 plus#
Just random remarks here and there plus 7.1-7.4's "no Vi minimum". But the value of R1 is not clear and I found no simple howto on the Web. I can tuck it inside a E25 lamp socket well immobile at the end of a hard wire. Component wires folded and 3 solder points, no need for soldering pads. So, I wired data sheet's fig 38 in a delicious layout on a 2×5 holes veroboard. I suspected over-voltage peaks and that current limiting is something to try. I replaced burned LEDs with a 220kΩ resistor but more LEDs burned. But the 69 (or 2×36) LED ones constantly failed in some homes of this country.
Some lamp models use pairs of parallel LEDs like 2×36. Cap's cos φ aka power factor determines the voltage at the LED chain.
Update: thanks for your answers and you want more detail.īasically: mains, dephasing cap, MB6S rectifier, smoothing cap, LED chain. What does a constant VBE=0.7V mean? Perfectly conducting?Īnd, BTW, how does the TL431 in the off (<2.5V) state know what VB=VK=to output? OK, OK, but how do I supply the 1 mA that seems to be required for correct operation? I see no minimum Vi spec and the TL431 seems to increase its resistance as I lower R1.Īnother concern is that rather much less that 19mA flows in RCL. Under this condition, feedback can be applied from the Cathode and Ref pins to create a replica of the internal reference voltage. More than 1mA (Imin(max)) must be supplied in to the cathode pin. The free-running current is 19mA and I use Rcl=100R to limit Iout to 25mA.Ĭalculating R1 is uneasy, so I made the following tests. Transistor is 2N2222, hfe=18 according to multimeter.
Vce designer 2.2.3 series#
Work inserted in a series of 69 LEDs to protect them according to this specification.
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