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DDX-2102 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

Part # DDX-2102
Description  All-Digital High Efficiency Power Amplifier
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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DDX-2102 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers

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DDX-2102
Specifications are subject to change without notice.
129 Morgan Drive, Norwood, MA 02062
voice: (781) 551-9450
fax: (781) 440-9528
email: apogee@apogeeddx.com
CONTROLLED DOCUMENT: P_903-000055_Rev08 DDX-2102 Data Sheet.doc
DRN: PRELIMINARY Page 7 of 17
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-2102 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, VL, is settled.
3.4
Parallel Output/High Current Operation
When using DDX® Mode output, the DDX-2102 outputs can be connected in parallel to increase the
output current to a load. In this configuration the device can provide over 130W@4
Ω (see Figure 7).
This mode is enabled with the CONFIG pin connected to VREG1 and the inputs combined
INLA = INLB, INRA = INRB and outputs combined OUTLA = OUTLB, OUTRA = OUTRB.
3.5
ADDITIONAL INFORMATION
3.6
Output Filter
A passive two-pole low-pass filter is used on the DDX-2102 power outputs to reconstruct an analog
signal. System performance can be significantly affected by the output filter design and choice of
components. (See appnote: AN-15, Component Selection for DDX Amplifiers.) A filter design for
6
Ω/8Ω loads is shown in the Typical Application Circuit in Figure 19. Figure 20 shows a filter design for
4
Ω loads. Figure 22 shows a filter for ½ bridge mode, 4Ω loads.
3.7
Power Dissipation &
Heat Sink Requirements
The power dissipated within the
device will depend primarily
on the supply voltage, load
impedance,
and
output
modulation level.
The surface mount package of
the DDX-2102 includes an
exposed thermal slug on the
top of the device to provide a
direct thermal path from the
integrated
circuit
to
the
heatsink. Careful consideration
must be given to the overall
thermal design. See Figure 5
for power derating.
For additional thermal design
considerations, see: AN19, Power Device Thermal Calculator.
For additional design considerations with binary mode operation, see application note:
AN-16, Applying the DDX-8000/DDX-8228 in Binary Mode.
0
10
20
30
40
50
60
0
1020
3040506070
8090 100 110 120 130 140 150
Slug Temperature Tc (°C)
Figure 5 –Power Derating Curve (Typical)


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