Apogee DX-1060 Manuel - Page 5

Parcourez en ligne ou téléchargez le pdf Manuel pour {nom_de_la_catégorie} Apogee DX-1060. Apogee DX-1060 14 pages. All-digital high efficiency power amplifiers

3.0 DDX-1080, DDX-1060 and DDX-1050 POWER DEVICES
The DDX-1080, DDX-1060 and DDX-1050 Power Devices are single channel H-Bridges that can
deliver more than 90/80/65 watts per channel (<10%THD) of audio output power at very high efficiency.
They convert both DDX
includes a logic interface, integrated bridge drivers, high efficiency MOSFET outputs, and thermal and
short circuit protection circuitry. In DDX
high-speed MOSFET switches to connect the speaker load to the input supply or to ground in a bridge
configuration, according to Apogee's patented damped ternary PWM. In Binary Mode operation, both
Full Bridge and Half Bridge Modes are supported. These devices include over-current and thermal
protection as well as under-voltage lockout with automatic recovery. A thermal warning status is also
provided.
INA[1:2]
INB[1:2]
Logic I/F
VL
and Decode
PWRDN
TRI-STATE
Protection
FAULT
Circuitry
TWARN
Regulators
Figure 2 – DDX-1080, DDX-1060 and DDX-1050
Block Diagram, Full- Bridge DDX
3.1
Logic Interface and Decode
The DDX-1080, DDX-1060 and DDX-1050 power outputs are controlled using one or two logic level
timing signals. In order to provide a proper logic interface, the V
®
voltage as the DDX
powered and stable prior to Vcc achieving > 7V to assure proper power up sequence.
recommended to remain powered and stable until after Vcc has decayed below 7V during power
removal.
3.2

Protection Circuitry

The DDX-1080, DDX-1060 and DDX-1050 include protection circuitry for over-current and thermal
overload conditions. A thermal warning pin TWARN is activated low (open-drain MOSFET) when the
IC temperature exceeds 130°C, in advance of the thermal shutdown protection. When a fault condition
is detected (logical OR of over-current and thermal), an internal fault signal acts to immediately disable
the output power MOSFETs, placing both H-bridge in a high impedance state. At the same time an
open-drain MOSFET connected to the FAULT pin is switched on.
There are two possible modes subsequent to activating a fault. The first is a SHUTDOWN mode. With
FAULT (pull-up resistor) and TRI-STATE pins independent, an activated fault will disable the device,
signaling low at the FAULT output. The device may subsequently be reset to normal operation by
toggling the TRI-STATE pin from High to Low to High using an external logic signal.
The second is an AUTOMATIC recovery mode. This is depicted in the application circuit in Figure 14.
The FAULT and TRI-STATE pins are shorted together and connected to a time constant circuit
comprising R
and C
T
129 Morgan Drive, Norwood, MA 02062
CONTROLLED DOCUMENT: P_903-000044_Rev08 DDX-1080_60_50 Data Sheet.doc
®
and binary-controlled PWM signals into audio power at the load. Each
®
mode, two logic level signals per channel are used to control
H-Bridge
®
or Binary Modes
controller logic supply. VL (Logic Reference Voltage) is recommended to be
. An activated FAULT will force a reset on the TRI-STATE pin causing normal
T
Specifications are subject to change without notice.
voice: (781) 551-9450
DDX-1080/DDX-1060/DDX-1050
INA[1:2]
INB[1:2]
VL
PWRDN
OUTA
TRI-STATE
OUTB
FAULT
TWARN
Figure 3 – DDX-1080, DDX-1060 and DDX-1050
Block Diagram, Binary Half-Bridge Mode
fax: (781) 440-9528
Logic I/F
and Decode
A
½-Bridge
B
Protection
½-Bridge
Circuitry
Regulators
input must operate at the same
L
DRN: PRELIMINARY
OUTA
OUTB
VL is
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