Crown Micro-Tech 1201 Información técnica descargar pdf (Pagina 34)

Page 34

Micro-Tech 600/1200/2400 Power Amplifiers

Reference Manual

Here are the equations used to calculate the data pre-

sented in Figures 7.1, 7.2 and 7.3:

AC Mains Power

Draw (watts)

Total output power with all

channels driven (watts)

Duty

Cycle

Amplifier Efficiency (.65)

Quiescent Power

Draw (watts)

The quiescent power draw figures provided in the op-

posite column are typical and include power drawn by

the fan. The following equation converts power draw in

watts to current draw in amperes:

Current Draw

(amperes)

AC Mains Power

Draw (watts)

AC Mains

Voltage

Power

Factor (.83)

The power factor of 0.83 is needed to compensate for

the difference in phase between the AC mains voltage

and current. The following equation is used to calculate

thermal dissipation:

Total output power with all

channels driven (watts)

Thermal

Dissipation

(btu/hr)

Quiescent Power

Draw (watts)

Duty

Cycle

Amplifier Efficiency (.65)

()

3.415

.35

The constant 0.35 is inefficiency (1.00–0.65) and the fac-

tor 3.415 converts watts to btu/hr. Thermal dissipation in

btu is divided by the constant 3.968 to get kcal. If you

plan to measure output power under real-world condi-

tions, the following equation may also be helpful:

Total measured output power

from all channels (watts)

Thermal

Dissipation

(btu/hr)

Quiescent Power

Draw (watts)

.35

Amplifier Efficiency (.65)

()

3.415

7 AC Power Draw and

Thermal Dissipation

This section provides detailed information about the

amount of power and current drawn from the AC mains

Micro-Tech

amplifiers and the amount of heat pro-

duced under various conditions. The calculations pre-

sented here are intended to provide a realistic and

reliable depiction of the amplifiers. The following as-

sumptions or approximations were made:

• The amplifier’s available channels are loaded, and full

power is being delivered.

• Amplifier efficiency at standard 1 kHz power is esti-

mated to be 65%.

• Typical quiescent power draw for the

Micro-Tech 600

is 65 watts; typical quiescent power draw for the

Mi-

cro-Tech 1200

and

2400

is 80 watts.

• Quiescent thermal dissipation equals 222 btu/hr at

65 watts and 273 btu/hr at 80 watts.

• The estimated duty cycles take into account the typi-

cal crest factor for each type of source material.

• Duty cycle of pink noise is 50%.

• Duty cycle of highly compressed rock ‘n’ roll midrange

is 40%.

• Duty cycle of rock ‘n’ roll is 30%.

• Duty cycle of background music is 20%.

• Duty cycle of continuous speech is 10%.

• Duty cycle of infrequent paging is 1%.

Fig. 7.1 Micro-Tech 600 Power Draw, Current Draw and

Thermal Dissipation at Various Duty Cycles

8 Ohm Stereo / 16 Ohm Bridge-Mono / 4 Ohm Parallel-Mono

L O A D

50%

40%

30%

20%

10%

415

345

275

205

135

640

555

470

390

305

580

475

375

270

170

210

180

150

120

680

560

435

315

190

960

810

665

520

370

5.0

4.1

3.3

2.5

1.6

6.9

5.7

4.5

3.2

2.0

8.2

6.7

5.2

3.7

2.3

Duty

Cycle

AC Mains

Power

Draw

(Watts)

btu/hr

Current Draw (Amps)

2.3

1.9

1.5

1.1

0.7

3.2

2.6

2.0

1.5

0.9

3.7

3.1

2.4

1.7

1.0

4 Ohm Stereo / 8 Ohm Bridge-Mono / 2 Ohm Parallel-Mono 2 Ohm Stereo / 4 Ohm Bridge-Mono / 1 Ohm Parallel-Mono

Micro-Tech 600

160

140

120

100

kcal/hr

835

715

590

470

345

245

205

170

130

100-120 V 220-240 V

Thermal Dissipation

btu/hr

Current Draw (Amps)

kcal/hr100-120 V 220-240 V

Thermal Dissipation

btu/hr

Current Draw (Amps)

kcal/hr100-120 V 220-240 V

Thermal Dissipation

AC Mains

Power

Draw

(Watts)

AC Mains

Power

Draw

(Watts)

1 2 ... 29 30 31 32 33 34 35 36 37 38

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