Apogee DX-1060 Manual - Page 5

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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

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

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

Specifications are subject to change without notice.

voice: (781) 551-9450

DDX-1080/DDX-1060/DDX-1050

INA[1:2]

INB[1:2]

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

½-Bridge

Protection

½-Bridge

Circuitry

Regulators

input must operate at the same

email: [email protected]

DRN: PRELIMINARY

OUTA

OUTB

VL is

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