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參數(shù)資料
| 型號(hào)： | VSC7927X |
| 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, UUC34 |
| 封裝： | 1.62 X 1.62 MM, DIE-34 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 124K |
| 代理商： | VSC7927X |
VITESSE
Preliminary Data Sheet
VSC7927
SONET/SDH 2.5Gb/s Laser Diode Driver
Page 4
G52201-0, Rev 3.0
04/05/01/01
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 VSC7927 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 * 150mA) + ((5.2 - 2.0) * 40mA) + ((5.2
-
- 2.0) * 20mA)
P
D
=
780mW + 128mW + 64mW = 972mW
The thermal rise from junction-to-case is
θ
JC
* P
D
. For the ceramic package,
θ
JCP
= 25
°
C/W. Thus the ther-
mal rise is:
25
°
C/W * 972W = 24.3
°
C
The maximum case temperature is:
125
°
C
–
24.3
°
C = 100.7
°
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 * 150mA) + (5.5 * 60mA) + (5.5mA * 50mA)
P
D
=
1.43W
This will net a maximum junction to case thermal rise of: 1.43W * 25
°
C/W = 35.8
°
C
This situation will allow maximum case temperature of: 35.8
°
C
–
58
°
C = 89.2
°
C
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VSC7927KFRL | SONET/SDH 2.5Gb/s Laser Diode Driver |
| VSC7928 | BOX 7.2 X 3.65 X 1.26 ALMOND |
| VSC7928RA | SONET/SDH 3.2Gb/s Laser Diode Driver |
| VSC7928X | SONET/SDH 3.2Gb/s Laser Diode Driver |
| VSC7937 | BOX 7.2 X 3.65 X 1.26 ALMOND |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VSC7928 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 3.2Gb/s Laser Diode Driver |
| VSC7928RA | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 3.2Gb/s Laser Diode Driver |
| VSC7928X | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:SONET/SDH 3.2Gb/s Laser Diode Driver |
| VSC7937 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:Single Supply 2.5Gb/s Voltage Driver |
| VSC7937KF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Laser Diode/LED Driver |
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