STA321 datasheet(60/157 Pages) STMICROELECTRONICS

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CMOS power stage

STA321

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Doc ID 15351 Rev 3

CMOS power stage

The CMOS half-bridge circuit of Figure 36 is a single channel analog output power stage.

There are three such output stages in the STA321, one for each of the outputs OUT1-3.

The switching mode is regulated by the logic circuit which ensures that the MOSFETs are

switched in such a way as to avoid (or minimize) conditions where both the PMOS and the

NMOS are conducting at the same time.

The input is a 1.8-V to 3.3-V level shifter followed by some combinational logic.

Figure 36.

CMOS half bridge block diagram

Table 24.

CMOS bridge signal descriptions

Pin Name

Direction

Description

FFX-ch

Digital audio signal coming from FFX block

Powerdown

Powerdown signal coming from the FFX block

Tristate

3-state signal from the FFX block

PopFree

Pop-free signal from the FFX block

Fault

Out

Short-circuit fault output feedback signal to digital core (active low)

Out

Channel half-bridge analog output

VCC33/GND33

Supply

Pre-driver analog supply

VDD/GND

Supply

Digital core supply generated by internal regulator

VCCx/GNDx

Supply

Half-bridge power supply

Logic

Pop-free

OutN

Driver P

Driver N

Level

shifter

Enable

logic

Power

Vcc33

GND33

Fault

GND33

GND

GNDx

VDD VCC33

VCCx

PopFree

Tristate

FaultN

FFX-ch N

Powerdown

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