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參數(shù)資料
| 型號： | UPBLED470B |
| 廠商： | MICROSEMI CORP-LOWELL |
| 元件分類： | LED |
| 英文描述： | SINGLE COLOR LED, HIGH BRIGHT BLUE, 1.4732 mm |
| 文件頁數(shù)： | 6/6頁 |
| 文件大?。?/td> | 337K |
| 代理商： | UPBLED470B |
Microsemi
580 Pleasant Street, Watertown, MA. 02472-2408, 617-926-0404, Fax: 617-924-1235
Page 6
Copyright
2002
Rev. 0.02, 2003-06-03
WWW
.Microse
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i
.CO
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UPBLED470B
HIGH BRIGHTNESS BLUE LED
PRODUCT PREVIEW
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:
T J T Case V F I Dpk
.
t p Rθ JS
.
τ
1
t p
τ
Z
θτ t
p
.
Z
θτ Zθtp
.
T Case V F I Dpk
t p Rθ JS
τ
t p
τ
Z
θτ t
p
Z
θτ Zθtp
TCase is at a specified temperature. VF and IDpk values are read off graph of forward voltage vs drive current. tp and τ
are set by the on-time and pulse period of the drive circuit. Thermal Impedances (Z
θ) and Thermal resistance (Rθ)
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)
UU
PP
BB
LL
EE
DD
4477
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