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MSK0024 Fiches technique(PDF) 3 Page - M.S. Kennedy Corporation

No de pièce MSK0024
Description  HIGH SPEED OPERATIONAL AMPLIFIER
Download  5 Pages
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Fabricant  MSK [M.S. Kennedy Corporation]
Site Internet  http://www.mskennedy.com
Logo MSK - M.S. Kennedy Corporation

MSK0024 Fiches technique(HTML) 3 Page - M.S. Kennedy Corporation

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APPLICATION NOTES
3
Rev. A
3/03
HEAT SINKING
To determine if a heat sink is necessary for your appli-
cation and if so, what type, refer to the thermal model
and governing equation below.
Thermal Model:
Governing Equation:
TJ = PD X (R
θJC + RθCS + RθSA) + TA
Where
TJ
= Junction Temperature
PD
= Total Power Dissipation
R
θJC
= Junction to Case Thermal Resistance
R
θCS = Case to Heat Sink Thermal Resistance
R
θSA = Heat Sink to Ambient Thermal Resistance
TC
= Case Temperature
TA
= Ambient Temperature
TS
= Sink Temperature
Example:
The example demonstrates a worst case analysis for
the op-amp output stage. This occurs when the output
voltage is 1/2 the power supply voltage. Under this con-
dition, maximum power transfer occurs and the output
is under maximum stress.
Conditions:
VCC=±16VDC
VOUT=±8Vp Sine Wave, Freq.=1KHz
RL=200
For a worst case analysis we treat the +8Vp sine wave
as an 8 VDC output voltage.
1.) Find driver power dissipation
PD=(VCC-VOUT) (VOUT/RL)
=(16V-8V) (8V/200
Ω)
=320mW
2.) For conservative design, set TJ =+125°C.
3.) For this example, worst case TA =+100°C.
4.) R
θJC = 58°C/W from MSK 032B Data Sheet.
5.) R
θCS=0.15°C/W for most thermal greases.
6.) Rearrange governing equation to solve for R
θSA:
R
θSA= ((TJ - TA) / PD) - (RθJC) - (RθCS)
= (125°C - 100°C)/0.32W - 58°C/W - 0.15°C/W
=78.1 - 58.15
=19.9°C/W
The heat sink in this example must have a thermal
resistance of no more than 19.9°C/W to maintain a junc-
tion temperature of less than +125°C.
INPUT CONSIDERATIONS
An input resistor (RIN below) is required in circuits
where the input to the MSK0024 will be subjected to
transient or continuous voltages exceeding the ±6V
maximum differential limit. This resistor will limit the cur-
rent that can be forced into the bases of the input tran-
sistors.
FEEDBACK RESISTORS
Feedback resistors should be of low enough value
(<5K recommended) to ensure that the time constant
formed with the capacitance at the summing junction
will not limit amplifier performance. If a larger resistor
must be used, a small (< 10pF) feedback capacitor may
be used in parallel with the feedback resistor to compen-
sate and optimize the performance of the MSK0024.
TYPICAL APPLICATION CIRCUIT
POWER SUPPLY BYPASSING
Both the negative and 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 micro-
farad ceramic capacitor in parallel with a 4.7 microfarad
tantalum capacitor from each power supply pin to ground.


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