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參數(shù)資料
| 型號： | MSK0033 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | FET INPUT HIGH SPEED VOLTAGE FOLLOWER/BUFFER AMPLIFIER |
| 中文描述： | 高速FET輸入電壓跟隨/緩沖放大器 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 449K |
| 代理商： | MSK0033 |
HEAT SINKING
To determine if a heat sink is necessary for your application
and if so, what type, refer to the thermal model and governing
equation below.
Example:
This example demonstrates a worst case analysis for the buffer
output stage. This occurs when the output voltage is 1/2 the
power supply voltage. Under this condition, maximum power
transfer occurs and the output is under maximum stress.
Conditions:
V
CC
= ±16VDC
V
O
= ±8Vp Sine Wave, Freq. = 1KHz
R
L
= 100
Governing Equation:
T
J
=P
D
x (R
θ
JC
+ R
θ
CS
+ R
θ
SA
) + T
A
Where
T
J
= Junction Temperature
P
D
= Total Power Dissipation
R
θ
JC
= Junction to Case Thermal Resistance
R
θ
CS
= Case to Heat Sink Thermal Resistance
R
θ
SA
= Heat Sink to Ambient Thermal Resistance
T
C
= Case Temperature
T
A
= Ambient Temperature
T
S
= Sink Temperature
R
θ
SA
= ((T
J
- T
A
)/P
D
) - (R
θ
JC
) - (R
θ
CS
)
= ((125°C - 80°C) / .64W) - 65°C/W - .15°C/W
= 70.3 - 65.15
= 5.2°C/W
The heat sink in this example must have a thermal resistance
of no more than 5.2°C/W to maintain a junction temperature of
no more than +125°C.
Thermal Model:
For a worst case analysis we will treat the ±8Vp sine wave
as an 8 VDC output voltage.
1.) Find Driver Power Dissipation
P
D
= (V
CC
-V
O
) (V
O
/R
L
)
= (16V-8V) (8V/100
)
= 640mW
2.) For conservative design, set T
J
=+125°C Max.
3.) For this example, worst case T
A
=+80°C
4.) R
θ
JC
= 65°C/W from MSK 0033B Data Sheet
5.) R
θ
CS
= 0.15°C/W for most thermal greases
6.) Rearrange governing equation to solve for R
θ
SA
POWER SUPPLY BYPASSING
Both the negative and the positive power supplies must be
effectively decoupled with a high and low frequency bypass
circuit to avoid power supply induced oscillation. An effective
decoupling scheme consists of a 0.1 microfarad ceramic ca-
pacitor in parallel with a 4.7 microfarad tantalum capacitor from
each power supply pin to ground.
APPLICATION NOTES
OFFSET VOLTAGE ADJUST
See Figure 1. To externally null the offset voltage, connect a
200
potentiometer between Pins 7 and 10 and leave Pin 6
open. If offset null is not necessary, short Pin 6 to Pin 7 and
remove the 200
potentiometer. Do not connect Pin 7 to -
Vcc.
CURRENT LIMITING
See Figure 1. If no current limit is required, short Pin 1 to Pin
12 and Pin 9 to Pin 10 and delete Q1 thru Q4 connections. Q1
through Q4 and the Rlim resistors form a current source current
limit scheme and current limit resistor values can be calculated
as follows:
+Rlim
Vbe -Rlim
Vbe
Isc Isc
Since current limit is directly proportional to the base-emitter
voltage drop of the 2N2222's and 2N2907's in the current
limit scheme, the current limit value will change slightly with
ambient temperature changes. The base-emitter voltage drop
will decrease as temperature increases causing the actual cur-
rent limit point to decrease.
3
Rev. B 7/00
相關PDF資料 |
PDF描述 |
|---|---|
| MSK0033B | FET INPUT HIGH SPEED VOLTAGE FOLLOWER/BUFFER AMPLIFIER |
| MSK101 | High Power Dual Operational Amplifier(150V高工作電壓，高速雙運算放大器) |
| MSK103 | Ultra High Voltage Dual Operational Amplifier(350V超高電壓雙運算放大器) |
| MSK105 | High Power Quad Operational Amplifier(高電壓，高輸出電流四運算放大器) |
| MSK121 | Dual High Power Bridge Amplifier(低成本雙橋放大器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MSK0033B | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:FET INPUT HIGH SPEED VOLTAGE FOLLOWER/BUFFER AMPLIFIER |
| MSK0033E | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:FET INPUT HIGH SPEED VOLTAGE FOLLOWER/BUFFER AMPLIFIER |
| MSK0041 | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:HIGH POWER OP-AMP |
| MSK-0041 | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:HIGH POWER OP-AMP |
| MSK0041B | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:HIGH POWER OP-AMP |
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