DocID11079 Rev 3

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STA515W

Application information

16

5

Application information

The STA515W is a dual channel H-bridge that can deliver 20 W per channel into 8

 with

10% THD at VCC = 18 V with high efficiency.

The STA515W converts both DDX and binary-logic-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 the high-speed

MOSFET switches which drive the speaker load in a bridge configuration, according to the

damped ternary modulation operation.

In binary mode, both full-bridge and half-bridge modes are supported.

The STA515W includes overcurrent and thermal protection as well as an undervoltage

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

Figure 5. Block diagram for DDX or binary modes

Figure 6. Block diagram for binary half-bridge mode

Logic interface and decode

The STA515W power outputs are controlled using one or two logic-level timing signals. In

order to provide a proper logic interface, pin VL must operate at the same voltage as the

DDX control logic supply.

Logic

interface

and

decode

OUTPL

OUTNL

Left

H-bridge

Protection

circuit

Regulators

OUTPR

OUTNR

Right

H-bridge

INL[1,2]

VL

PWRDN

TRISTATE

FAULT

THWARN

INR[1,2]

OUTPL

Left A

bridge

Logic

interface

and

decode

Protection

circuit

Regulators

INL[1,2]

VL

PWRDN

TRISTATE

FAULT

THWARN

INR[1,2]

OUTNL

Left B

bridge

OUTPR

Right A

bridge

OUTNR

Right B

bridge