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參數(shù)資料
| 型號： | VSC7924KF |
| 廠商： | VITESSE SEMICONDUCTOR CORP |
| 元件分類： | 其它接口 |
| 英文描述： | SONET/SDH 2.5Gb/s Laser Diode Driver |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, CQFP24 |
| 封裝： | CERAMIC, STRAIGHT LEAD PACKAGE-24 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 110K |
| 代理商： | VSC7924KF |
VITESSE
Preliminary Data Sheet
VSC7924
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 4
G52156-0, Rev 3.0
05/01/01
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 VSC7924 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
=
(-
V
SS
*
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
)
P
D
=
1144mW + 128mW + 64mW = 1.336W
The thermal rise from junction to case is
θ
JC
*
P
D
. For the ceramic package,
θ
JC
= 25
°
C/W. Thus the ther-
mal rise is:
25
°
C/W * 1.336W = 33.4
°
C
The maximum case temperature is:
125
°
C
–
33.4
°
C = 91.6
°
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 * 25
°
C/W = 45.4
°
C
This situation will allow maximum case temperature of: 125
°
C
–
45.4
°
C = 79.6
°
C
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VSC7924KFL | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7925 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7925KF | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7925KFL | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7927 | 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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