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| 型號(hào)： | UPBLED470L |
| 英文描述： | LED |
| 中文描述： | 發(fā)光二極管 |
| 文件頁數(shù)： | 6/6頁 |
| 文件大?。?/td> | 340K |
| 代理商： | UPBLED470L |
Microsemi
580 Pleasant Street, Watertown, MA. 02472-2408, 617-926-0404, Fax: 617-924-1235
Page 6
Copyright
2002
Rev. 0.02, 2003-01-15
W
M
.
C
UPBLED470B
HIGH BRIGHTNESS BLUE LED
RODUCT
P
REVIEW
CALCULATION FOR SAFE OPERATION ABOVE 20 ma dc
:
The power dissipation must be held at a level to maintains the junction below the maximum specified operating temperature.
Duty cycle control may be used to establish the safe operating condition using a train of pulses.
LED Junction temperature may be calculated by use of the following:
TJ
TCase
VFIDpk
1
tp
tp
.
.
tpR
θ
JS
τ
τ
Z
θ
τ
Z
θ
τ
Z
θ
tp
T
Case
is at a specified temperature.
V
F
and
I
Dpk
values are read off graph of forward voltage vs drive current.
t
p
and
τ
are set by the on-time and pulse period of the drive circuit. Thermal Impedances (
Z
θ
) and Thermal resistance (
R
θ
)
values are read from Thermal Impedance graph.
Conversion of 1931 x y coordinates to 1960
u v
coordinates:
u = 4x/(-2x + 12y + 3) , v = 6y/(-2x + 12y +3)
Conversion of 1960
u v
coordinates to 1931
x y
coordinates:
x = 3u/(2u – 8v +4), y = 2v/(2u –8v +4).
* UPBLED-470B SPICE MODEL
.model UPBLED-470B D(Is=1E-30 N=1.923 Rs=32 Ikf=42.04 Eg=3.6 Cjo=63.87p
+ M=.1513 Vj=2.02 Fc=.5 Isr=1.3m Nr=3.4Meg Bv=12 Ibv=369.5u
+ Tt=432.8n Xti=5)
U
P
B
L
E
D
4
7
0
-
B
A
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