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| 型号： | UPVLED |
| 厂商： | MICROSEMI CORP-LOWELL |
| 元件分类： | LED |
| 英文描述： | SINGLE COLOR LED, ULTRA VIOLET, 1.47 mm |
| 文件页数： | 7/7页 |
| 文件大小： | 236K |
| 代理商： | UPVLED |
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Microsemi
580 Pleasant Street, Watertown, MA. 02472-2408, 617-926-0404, Fax: 617-924-1235
Page 7
Copyright
2002
Rev. 0.02, 2003-01-15
WWW
.Microse
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i
.CO
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UPVLED
ULTRA-VIOLET 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.
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