DocID11077 Rev 4

11/21

STA510A

Technical information

21

4

Technical information

The STA510A is a dual channel H-bridge that is able to deliver 100 W per channel (into RL =

6

Ω with THD = 10% and V

CC = 36 V) of audio output power very efficiently. It operates in

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

The STA510A 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 STA510A

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

automatic recovery. A thermal warning status is also provided.

Figure 6. Block diagram of full-bridge DDX® or binary mode

Figure 7. Block diagram of f binary half-bridge mode

4.1

Logic interface and decode

The STA510A 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

the DDX control logic supply.