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參數(shù)資料
| 型號(hào)： | VSC7923 |
| 廠商： | Vitesse Semiconductor Corporation. |
| 英文描述： | SONET/SDH 2.5Gb/s Laser Diode Driver |
| 中文描述： | SONET / SDH的容量高達(dá)2.5GB / s的激光二極管驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大小： | 138K |
| 代理商： | VSC7923 |
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VITESSE
Preliminary Data Sheet
VSC7923
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 4
G52203-0, Rev 3.0
05/11/01
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano
Camarillo, CA 93012
Tel: (800) VITESSE
FAX: (805) 987-5896
Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Calculation of the Maximum Case Temperature
The VSC7923 is designed to operate with a maximum junction temperature of 125
°
C. The rise from the case to
junction is determined by the power dissipation of the device. The power dissipation is determined by the V
SS
current plus the operating I
MOD
and I
BIAS
currents.
The power of the chip is determined by the following formula:
P
D
=(-VSS * I
SS
) + ((V
IOUT
–
V
SS
) * I
MOD
) + ((V
IBIAS
–
V
SS
) * I
BIAS
)
For example with:
V
SS
I
MOD
I
BIAS
V
IBIAS
V
IOUT
= -5.2V
= 40mA
= 20mA
= -2.0V
= -2.0V
P
D
= 5.2 * 220mA) + ((5.2 - 2.0) * 40mA) + ((5.2-- 2.0) * 20mA)
PD = 1144mW + 128mW + 64mW = 1.336W
The thermal rise from junction to case is
θ
JC
* P
D
. For the metal glass package,
θ
JC
= 32
°
C/W. Thus the ther-
mal rise is:
32
°
C/W * 1.336W = 42.7
°
C
The maximum case temperature is:
125
°
C
–
42.7
°
C = 82.3
°
C
The absolute maximum power dissipation of the device is at:
V
SS
I
MOD
I
BIAS
V
IBIAS
V
IOUT
= -5.5V
= 60mA
= 50mA
= 0V
= 0V
P
D
= (5.5 * 220mA) + (5.5 * 60mA) + (5.5mA * 50mA)
P
D
= 1.815W
This will net a maximum junction to case thermal rise of: 1.815W * 32
°
C/W = 58
°
C
This situation will allow maximum case temperature of: 125
°
C
–
58
°
C = 67
°
C
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| VSC7924 | SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7924KF | SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7924KFL | SONET/SDH 2.5Gb/s Laser Diode Driver |
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| VSC7927 | SONET/SDH 2.5Gb/s Laser Diode Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VSC7923CA | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7923KF | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7923KFL | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7923X | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7924 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
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