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just ran a test yesterday
( i saved some of likely the L128-6580EC35000B1 from failed LED bulb , been step by step testing them while i get the time for ...)
so the one was attached to ~AC invetrter's MOSFET heat sink 6x24x48mm (about 5 in² total -both all sides included)
with 9.04V 97.1mA I.FW (878mW) the sink.. (purely measured - a poor thermal contact to T - probe) ..seemd to reach 38°C at 25°C ambient open atmosphere
maybe useful :
https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
https://www.rohm.com/electronics-basics/transistors/calculating-transistor-temperature
https://www.heatsinkcalculator.com/...lat-plate-heat-sink-in-multiple-orientations/
https://www.ti.com/lit/an/slua844b/slua844b.pdf?ts=1598129440574&ref_url=https%3A%2F%2Fwww.google.com%2F
https://www.infineon.com/dgdl/an-1057.pdf?fileId=5546d462533600a401535591d3170fbd
————————————————————————
it is however impossible to estimate the junction temperature . . . involves 4 unknowns RJC (not sure of the exact device model/type) RCA RC-HS RHS-A
... also the convection would likely vary the RHS-A for combinations of the THS TA ...
(misty science)
( i saved some of likely the L128-6580EC35000B1 from failed LED bulb , been step by step testing them while i get the time for ...)
so the one was attached to ~AC invetrter's MOSFET heat sink 6x24x48mm (about 5 in² total -
with 9.04V 97.1mA I.FW (878mW) the sink.. (purely measured - a poor thermal contact to T - probe) ..seemd to reach 38°C at 25°C ambient open atmosphere
maybe useful :
https://www.engineeringtoolbox.com/thermal-conductivity-d_429.html
https://www.rohm.com/electronics-basics/transistors/calculating-transistor-temperature
https://www.heatsinkcalculator.com/...lat-plate-heat-sink-in-multiple-orientations/
https://www.ti.com/lit/an/slua844b/slua844b.pdf?ts=1598129440574&ref_url=https%3A%2F%2Fwww.google.com%2F
https://www.infineon.com/dgdl/an-1057.pdf?fileId=5546d462533600a401535591d3170fbd
————————————————————————
it is however impossible to estimate the junction temperature . . . involves 4 unknowns RJC (not sure of the exact device model/type) RCA RC-HS RHS-A
... also the convection would likely vary the RHS-A for combinations of the THS TA ...
(misty science)
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