Applications information

STA516B

10/17

Doc ID 13183 Rev 4

5

Applications information

The STA516B is a dual channel H-bridge that is able to deliver 200 W per channel (into

in conjunction with a pulse-width modulator driver such as the STA321 or STA309A.

The STA516B converts ternary, phase-shift or 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 differential mode (ternary, phase-shift or binary differential), 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, both full bridge and half bridge modes are supported. The STA516B

includes overcurrent and thermal protection as well as an undervoltage lockout with

automatic recovery. A thermal warning status is also provided.

Figure 5.

Figure 6.

Block diagram of binary half-bridge mode

5.1

Logic interface and decode

The STA516B power outputs are controlled using one or two logic-level timing signals. In

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

INL[1,2]

INR[1,2]

VL

PWRDN

TRISTATE

FAULT

THWARN

OUTPL

OUTNL

OUTPR

OUTNR

Left

H-bridge

Logic

interface

and

decode

Protection

Regulators

Right

H-bridge

INL[1,2]

INR[1,2]

VL

PWRDN

TRISTATE

FAULT

THWARN

OUTPL

OUTNL

OUTPR

OUTNR

LeftA

½-bridge

Logic

interface

and

decode

Protection

Regulators

LeftB

½-bridge

RightA

½-bridge

RightB

½-bridge