3554 データシートの表示（PDF） - Anaren Microwave

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3554

HIGH SPEED, WIDEBAND OPERATIONAL AMPLIFIER

Anaren Microwave 

APPLICATION NOTES

HEAT SINKING

Refer to the following thermal model and governing equations to

determine appropriate heat sinking for your application.

Thermal Model:

RθSA = ((TJ - TA)/PD) - (RθJC) - (RθCS)

= ((125°C - 90°C) / .64W) - 37°C/W - .15°C/W

= 54.7 - 37.15

= 17.54°C/W

The heat sink in this example must have a thermal resistance of

no more than 17.54°C/W to maintain a junction temperature of no

more than +125°C.

OFFSET NULL

Typically, the MSK3554(B) has an input offset voltage of less

than ±0.5mV. If it is desirable to adjust the offset closer to "zero",

or to a value other than "zero", the circuit below is recommended.

Rp should be a ten-turn 20KΩ potentiometer. Typical offset adjust

is ±20mV.

Governing Equation:

TJ=PD x (RθJC + RθCS + RθSA) + TA

Where

TJ = Junction Temperature

PD = Total Power Dissipation

RθJC = Junction to Case Thermal Resistance

RθCS = Case to Heat Sink Thermal Resistance

RθSA = Heat Sink to Ambient Thermal Resistance

TC = Case Temperature

TA = Ambient Temperature

TS = Sink Temperature

Example:

This 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 condition, maximum power transfer

occurs and the output is under maximum stress.

Conditions:

VCC = ±16VDC

VO = ±8Vp Sine Wave, Freq. = 1KHZ

RL = 100Ω

For a worst case analysis we will treat the +8Vp sine wave as

an 8 VDC output voltage.

1.) Find Driver Power Dissipation

PD = (VCC-VO) (VO/RL)

= (16V-8V) (8V/100Ω)

= .64W

2.) For conservative design, set TJ=+125°C

3.) For this example, worst case TA=+90°C

4.) RθJC = 37°C/W from MSK3554B Data Sheet

5.) RθCS = 0.15°C/W for most thermal greases

6.) Rearrange governing equation to solve for RθSA

COMPENSATION

The compensation capacitor is connected between pins 1 and 3

and is used to optimize bandwidth and slew rate while maintaining

circuit stability. The effect of compensation capacitance can be seen

in the Bode Plot under the Typical Performance Curves. As closed

loop gain increases, compensation capacitance can decrease and

higher slew rates and wider bandwidths will be realized. See the

component selection table for recommended values of input and

feedback resistance as well as feedback capacitance and com-

pensation capacitance.

GAIN

-1

-10

-100

follower

COMPONENT SELECTION TABLE

Rin

Rfb

Cfb

5.6KΩ

5.6KΩ

2.0pF

560Ω

5.6KΩ

1.2pF

100Ω

10KΩ

0.0pF

0Ω

0Ω

0pF

Ccomp

10pF

10pF

0.0pF

12pF

3

8548-155 Rev. E 10/15

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