Technical information

STA518

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Technical information

The STA518 is a dual channel H-Bridge that is able to deliver 50W per channel (@

The STA518 converts both DDX and binary-controlled PWM signals into audio power at the

load. It includes a logic interface , integrated bridge drivers, high efficiency MOSFET outputs

and thermal and short circuit protection circuitry.

In DDX mode, two logic level signals per channel are used to control high-speed MOSFET

switches to connect the speaker load to the input supply or to ground in a Bridge

configuration, according to the damped ternary Modulation operation.

In Binary Mode operation , both Full Bridge and Half Bridge Modes are supported. The

STA518 includes over-current and thermal protection as well as an under-voltage

Lockout with automatic recovery. A thermal warning status is also provided.

Figure 6.

Figure 7.

STA518 Block Diagram Binary Half-Bridge Mode

4.1

Logic interface and decode:

The STA518 power outputs are controlled using one or two logic level timing signals. In

order to provide a proper logic interface, the Vbias input must operate at the dame voltage

as the DDX control logic supply.

Protection circuitry:

Logic I/F

and Decode

Left

H-Bridge

Protection

Circuitry

INL[1:2]

INR[1:2]

PWRDN

OUTPL

FAULT

VL

TRI-STATE

OUTNL

OUTPR

OUTNR

TWARN

Regulators

Right

H-Bridge

Logic I/F

and Decode

LeftA

‰-Bridge

Protection

Circuitry

INL[1:2]

INR[1:2]

PWRDN

OUTPL

FAULT

VL

TRI-STATE

OUTNL

OUTPR

OUTNR

TWARN

Regulators

RightA

‰-Bridge

LeftB

‰-Bridge

RightB

‰-Bridge