TDF8591TH_1

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 01 — 5 March 2008

3 of 34

NXP Semiconductors

TDF8591TH

2

× 100 W SE (4 Ω) or 1 × 310 W BTL (4 Ω) class-D amplifier

5.2 Pin description

[1]

6.

Functional description

6.1 Introduction

The TDF8591TH is a dual channel audio power amplifier using class-D technology. The

audio input signal is converted into a Pulse Width Modulated (PWM) signal via an analog

input stage and PWM modulator. To enable the output power transistors to be driven, this

digital PWM signal is applied to a control and handshake block and driver circuits for both

the high-side and low-side. An external 2nd-order low-pass filter converts the PWM output

signal to an analog audio signal across the loudspeakers.

Table 2.

Pin description

Symbol

Pin

Description

1

negative analog supply voltage for channel 2

SGND2

2

signal ground for channel 2

3

positive analog supply voltage for channel 2

IN2M

4

negative audio input for channel 2

IN2P

5

positive audio input for channel 2

MODE

6

mode selection input: standby, mute or operating

OSC

7

oscillator frequency adjustment or tracking input

IN1P

8

positive audio input for channel 1

IN1M

9

negative audio input for channel 1

10

positive analog supply voltage for channel 1

SGND1

11

signal ground for channel 1

12

negative analog supply voltage for channel 1

DIAG

13

diagnostic for activated current protection

14

positive power supply voltage for channel 1

BOOT1

15

bootstrap capacitor for channel 1

OUT1

16

PWM output from channel 1

17

negative power supply voltage for channel 1

STABI

18

decoupling of internal stabilizer for logic supply

n.c.

19

not connected

20

negative power supply voltage for channel 2

OUT2

21

PWM output from channel 2

BOOT2

22

bootstrap capacitor for channel 2

23

positive power supply voltage for channel 2

24

negative digital supply voltage[1]