LEFT

RIGHT

INPUT

STAGE

DEPOP

CHARGE

PUMP

POWER

MANAGEMENT

SHUTDOWN

CONTROL

THERMAL

CURRENT

LIMIT

HPLEFT

HPRIGHT

SD

VDD

GND

VDD

GND

CPP

CPN

CPVSS

RIGHTINP

RIGHTINM

LEFTINP

LEFTINM

TEST1

TEST2

TPA6133A2

SLOS821B – JUNE 2013 – REVISED SEPTEMBER 2014

www.ti.com

8 Detailed Description

8.1 Overview

Headphone channels and the charge pump are activated by asserting the SD pin to logic 1. The charge pump

generates a negative supply voltage for the output amplifiers. This allows a 0 V bias at the outputs, eliminating

the need for bulky output capacitors. The thermal block detects faults and shuts down the device before damage

occurs. The current limit block prevents the output current from getting high enough to damage the device. The

De-Pop block eliminates audible pops during power-up, power-down, and amplifier enable and disable events.

8.2 Functional Block Diagram

10

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