Overture Design Guide15

8/10/2019 Overture Design Guide15

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Rev 1.5 Last Update: 10/22/2004

LM4782 LM4781 LM1876 LM4765 LM4766 LM4780 LM47

4780 TA/TF 31.23

35.00 Volts 3.90

42.0 Volts 60.94

7.0 Volts 21.00 V/V

8.00 W 26.44 dB

20.0 kW 8.0 Hz

1.0 kW 1.487 VRMS

47.0 mF NA kW

1.0 kW 4.7 W 31.03 Wat

20.0 kW 0.1 mF 65.73 Wat

1.00 mF 20.0 kW 25.0 C

1.10 C/W

NA C/W

12

3

4

5

6

7

RL(load impedance) =

TF Package =

RM(Mute)=

*RSN(Snubber) =

*CSN(Snubber) =

as listed in the power calculation.

Input for 1% Output =

Input Impedance =

for all configurations with loads

Gain (Not for BTL) =

Vcc/Vee (+/-) =

Voltage Headroom =

Vpeakat Load =

Ipeakin Load =

Enter Information Below

Max Operating Volt. =

Instructions: BLUEcolored cells are variables that you enter.

Part Number: LM

Rf(feedback) =

Ri=

Lower -3dB cutoff =

Gain (Not for BTL) =

1% THD Output @

Power Dissipation

and Thermal Design

Max PDat POUT =

Total PD/IC =

Enter Tambient=

Heat Sink Size (QSAin C/W)/IC*Optional/Recommended Components

Warnings and Errors:

TA Package =

5. For use with part numbers listed in t

An ORANGEhighlighted cell is a possible design problem.

Note: All calculations on this spreadsheet are approximate calculations. Performance should be verified using

Ci=

RB=

*Optional Components

*Cin=

*Rin=

2. Amplifier is designed in the non-inve

3. Amplfier is using a positive (+) and n

4. Thermal grease is used between the

Assumptions:

Component names taken from datasheets.Calculations

YELLOWcolored cells are

Stereo Parts3 Ch. Parts

Best viewed when monitor is set to 1280x1024 resolution or higher.

1. Ouput power calculated for 4

, 6

,


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LM3875 LM3876 LM3886

16.00

121.88

All Chs. 2 Chs.

2.00 4.00

237.69 118.85

2 1

4 2

Mode Power Calculation

edance =

ion above only.

ell is a design error.

nd proper heatsink.

n in the datasheet.

of equal value.

k. Isolation washers are not inclu

n the the blue cells.

Parts

mps.(X) =

to Load @

ed (RL/X)

gle-ended mode.

e Load Impedance =

er into Bridge Load @

Mode Power Calculation

load as listed below (2xRL).

packages)=


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Rev 1.5 Last Update: 10/22/2004

PD(MAX)= 31.03 Part #: LM 4780

Iqat VCC/VEE(mA) = 210 Channels = 2

1% POUT(W) = 60.94

Best viewed when monitor is set to 1280x1024 or higher resol

formulas at BC485

Note: All calculations on this spreadsheet are approximate calculations.

0

10

20

30

40

50

60

70

0 5 10 15 20 25 30 35 40 45

PowerDissipation(W)

Output Po

Total Power Dissipation


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ution.

erformance should be verified using an evaluation board and proper heatsink.

50 55 60 65 70 75 80 85 90 95 100

er/Channel (W)

per IC vs. Output Power


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Mono Stereo 3 Power

SE SE Channel Supply

POUT (W) VOpeak(V) PD(W) PDICq(W) PDICq(W) PDICq(W) PTOT(W)

0.000 0.000 0.000 7.350 7.3501.000 4.000 10.141 23.957 25.957

2.000 5.657 13.756 31.186 35.186

3.000 6.928 16.297 36.268 42.268

4.000 8.000 18.282 40.238 48.238

5.000 8.944 19.912 43.498 53.498

6.000 9.798 21.289 46.254 58.254

7.000 10.583 22.476 48.627 62.627

8.000 11.314 23.511 50.697 66.697

9.000 12.000 24.423 52.520 70.520

10.000 12.649 25.230 54.136 74.136

11.000 13.266 25.950 55.575 77.575

12.000 13.856 26.593 56.861 80.861

13.000 14.422 27.169 58.013 84.013

14.000 14.967 27.685 59.045 87.045

15.000 15.492 28.148 59.972 89.972

16.000 16.000 28.563 60.802 92.802

17.000 16.492 28.935 61.545 95.545

18.000 16.971 29.267 62.208 98.208

19.000 17.436 29.562 62.799 100.799

20.000 17.889 29.823 63.322 103.322

21.000 18.330 30.054 63.783 105.783

22.000 18.762 30.255 64.185 108.185

23.000 19.183 30.430 64.534 110.534

24.000 19.596 30.579 64.833 112.833

25.000 20.000 30.704 65.083 115.08326.000 20.396 30.807 65.290 117.290

27.000 20.785 30.890 65.454 119.454

28.000 21.166 30.952 65.579 121.579

29.000 21.541 30.995 65.666 123.666

30.000 21.909 31.021 65.717 125.717

31.000 22.271 31.030 65.734 127.734

32.000 22.627 31.022 65.719 129.719

33.000 22.978 30.999 65.674 131.674


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34.000 23.324 30.962 65.598 133.598

35.000 23.664 30.910 65.495 135.495

36.000 24.000 30.845 65.365 137.365

37.000 24.331 30.767 65.209 139.209

38.000 24.658 30.677 65.029 141.029

39.000 24.980 30.575 64.824 142.824

40.000 25.298 30.461 64.597 144.59741.000 25.612 30.336 64.347 146.347

42.000 25.923 30.201 64.077 148.077

43.000 26.230 30.055 63.786 149.786

44.000 26.533 29.900 63.475 151.475

45.000 26.833 29.735 63.145 153.145

46.000 27.129 29.561 62.797 154.797

47.000 27.423 29.378 62.431 156.431

48.000 27.713 29.186 62.047 158.047

49.000 28.000 28.986 61.647 159.647

50.000 28.284 28.778 61.230 161.230

51.000 28.566 28.562 60.798 162.798

52.000 28.844 28.338 60.351 164.35153.000 29.120 28.107 59.888 165.888

54.000 29.394 27.868 59.411 167.411

55.000 29.665 27.623 58.920 168.920

56.000 29.933 27.370 58.416 170.416

57.000 30.199 27.112 57.898 171.898

58.000 30.463 26.846 57.367 173.367

59.000 30.725 26.574 56.824 174.824

60.000 30.984 26.297 56.268 176.268


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Overture Design Guide15

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