Apogee DX-1060 Manuale - Pagina 6

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operation to resume following a delay determined by the time constant of the circuit. If the fault
condition is still presented, the circuit operation will continue repeating until such time as the fault
condition is removed. An increase in the time constant of the circuit will produce a longer recovery
interval. Care must be taken in the overall system design so as not to exceed the protection thresholds
under normal operation.
3.3
Power Outputs
The DDX-1080, DDX-1060 and DDX-1050 power and output pins are duplicated to provide a low
impedance path for the device's bridged outputs. All duplicate power, ground and output pins must be
connected for proper operation. The PWRDN or TRI-STATE pins should be used to set all MOSFETS
to the Hi-Z state during power-up until the logic power supply, V
3.4

ADDITIONAL INFORMATION

3.5
Output Filter
A passive two-pole low-pass filter is used on the DDX-1080, DDX-1060 and DDX-1050 power outputs
to reconstruct an analog signal. System performance can be significantly affected by the output filter
design and choice of components. (See appnote:
filter design for 6Ω/8Ω loads is shown in the Typical Application Circuit in Figure 14. Figure 16 shows a
filter for ½ bridge mode, 4Ω loads.
3.6
Power Dissipation &
Heat Sink Requirements
The power dissipated within the
device will depend primarily
on the supply voltage, load
impedance,
and
modulation level.
The surface mount package of
the DDX-1080, DDX-1060 and
DDX-1050 include an exposed
thermal slug on the top of the
device to provide a direct
thermal
path
from
integrated
circuit
heatsink. Careful consideration
must be given to the overall
thermal design. See Figure 4
for power derating.
For additional thermal design considerations, see:
For additional design considerations with binary mode operation, see application note:
AN-16, Applying the DDX-8000/DDX-8228 in Binary Mode.
129 Morgan Drive, Norwood, MA 02062
CONTROLLED DOCUMENT: P_903-000044_Rev08 DDX-1080_60_50 Data Sheet.doc
60
50
40
output
30
20
10
the
0
to
the
0
Specifications are subject to change without notice.
voice: (781) 551-9450
DDX-1080/DDX-1060/DDX-1050
, is settled.
L
AN-15, Component Selection for DDX
10
20
30
40
50
60
Slug Temperature Tc (°C)
Figure 4 – Power Derating Curve (Typical)
AN19, Power Device Thermal
fax: (781) 440-9528
Amplifiers.) A
70
80
90 100 110 120 130 140 150
Calculator.
DRN: PRELIMINARY
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