AN1149-3A Lumileds Lighting, LLC, AN1149-3A Datasheet - Page 5
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AN1149-3A
Manufacturer Part Number
AN1149-3A
Description
Advanced Electrical Design Models
Manufacturer
Lumileds Lighting, LLC
Datasheet
1.AN1149-3A.pdf
(7 pages)
instantaneous luminous flux (i.e. at initial turn
on) when the LED emitter is driven at a constant
forward current at a constant ambient
temperature. Equation #3.8A models the
thermally stabilized luminous flux at any forward
current compared to the instantaneous
luminous flux prior to heating at a specified
forward current and a constant ambient
temperature. Equation #3.9A models the
thermally stabilized luminous flux at any forward
current compared to the thermally stabilized
luminous flux at test conditions of I
and R
A good example of an application for Equation
#3.9A is the normalized luminous flux versus
forward current graph shown in Figure 3 of the
SuperFlux LED Data Sheet. Finally, Equation
#3.10A models the thermally stabilized luminous
θ
JA TEST
at a constant ambient temperature.
F TEST
, V
F TEST
,
5
flux over temperature compared to the thermally
stabilized luminous flux at test conditions of I
V
#3.8A, #3.9A, and #3.10A, that for forward
currents over 30 mA, m
Figure 3.4A. Maximum DC Forward Current versus
Ambient Temperature for HPWA-xxOO LED Emitter
with Different System Thermal Resistances.
F TEST
, and R
θ
JA TEST
, at 25°C. Note for Equations
≈
1.0.
F TEST
,