DS51 Datasheet, PDF (8/41 Pages) Lumileds Lighting Company – the most robust and powerful LED

Electrical Characteristics
Electrical Characteristics at 350mA
Part Numbers LXK2 xxx2 xxx, Junction Temperature, T_J = 25ºC
Color
Cool White^[4]
Neutral White^[4]
Warm White^[4]
Green^[4]
Cyan^[4]
Blue^[4]
Royal Blue^[4]
Red
Red Orange
Amber
Forward Voltage V_f ^[1]
(V)
Min.
Typ.
Max.
2.79
3.42
4.23
2.79
3.42
4.23
2.79
3.42
4.23
2.79
3.42
4.23
2.79
3.42
4.23
2.79
3.42
4.23
2.79
3.42
4.23
2.31
2.95
3.51
2.31
2.95
3.51
2.31
2.95
3.51
Table 4.
Typical
Dynamic
Resistance ^[2]
(Ω)
R_D
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.4
2.4
2.4
Typical Temperature
Coefficient of
Forward
Voltage ^[3]
(mV/^oC)
ΔV_F / ΔT_J
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
Typical
Thermal
Resistance
Junction to
Case (^oC/W)
Rθ_{J C}
9 (13 for Star)
9 (13 for Star)
9 (13 for Star)
9
9
9
9
12
12
12
Notes for Table 4:
1. Philips Lumileds maintains a tolerance of ±0.06V on forward voltage measurements.
2. Dynamic resistance is the inverse of the slope in linear forward voltage model for LEDs. See figures 14 and 15.
3. Measured between 25°C = T_J = 110°C at I_f = 350 mA.
4. The forward voltage of the LUXEON K2 LED will reduce by up to 0.30V at 350mA during the first few hours of operation
after SMT reflow. Due to this effect, Philips Lumileds recommends current source drive for consistent and reliable perform
ance. Cross connected series/parallel arrays or voltage drivers which could result in current hogging or variation in drive
current are not recommended. Please consult your Philips Lumileds authorized distributor or Philips Lumileds Sales
Representative for further information.
LUXEON K2 Datasheet DS51 (7/07)
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