Hello,
We have had a LED tube light designed for us, vin=20v-140v, Output = ten paralleled banks of four_LEDs_in_series. It’s a Buck converter with output current regulated to 1.67A
All LEDs are on a long piece of MCPCB. The LEDs are 2.5cm apart.
No dropping resistors at all.
The designer told us that we will not get thermal runaway in any of the paralleled LED strings, because all the LEDs are in this totally unventilated tube, and so they will all be “frying” in each others heat….(so none can ’run away’ thermally). Do you agree with this?
Also, the LEDs are 700mA Luxeon Rebel Plus LEDs, but are only run at 166mA each, and LEDs operated at the lower end of their V/I curve share current better when paralleled. Do you agree?
We have had a LED tube light designed for us, vin=20v-140v, Output = ten paralleled banks of four_LEDs_in_series. It’s a Buck converter with output current regulated to 1.67A
All LEDs are on a long piece of MCPCB. The LEDs are 2.5cm apart.
No dropping resistors at all.
The designer told us that we will not get thermal runaway in any of the paralleled LED strings, because all the LEDs are in this totally unventilated tube, and so they will all be “frying” in each others heat….(so none can ’run away’ thermally). Do you agree with this?
Also, the LEDs are 700mA Luxeon Rebel Plus LEDs, but are only run at 166mA each, and LEDs operated at the lower end of their V/I curve share current better when paralleled. Do you agree?
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