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TFA9842AJ

7.5 W stereo power amplifier with volume control

NXP Semiconductors. 

Philips Semiconductors

TFA9842AJ

7.5 W stereo power amplifier with volume control

7.2 Pin description

Table 3.

Symbol

IN2

OUT2

CIV

IN1

GND

SVR

VC

OUT1

VCC

Pin description

Pin

1

2

3

4

5

6

7

8

9

Description

input 2

loudspeaker terminal 2

common input voltage decoupling

input 1

ground

half supply voltage decoupling (ripple rejection)

volume control input (standby, mute and volume control)

loudspeaker terminal 1

supply voltage

8. Functional description

8.1 Input configuration

The input cut-off frequency is:

f i(–3dB) = 2----π---(---R---1-i---×----C-----i-)-

(1)

Single-ended application: Ri = 60 kΩ and Ci = 220 nF:

f i(–3dB) = 2----π---(---6---0----×-----1---0---3---1-×-----2---2---0----×-----1---0---–---9--)- = 12 Hz

(2)

As shown in Equation 2, large capacitor values for the inputs are not necessary; therefore

switch-on delay during charging of the input capacitors can be minimized. This results in a

good low frequency response and good switch-on behavior.

The TFA9842AJ has clamps on the inputs. In Standby mode the voltage on the input pins

is clamped for voltages lower than −0.1 V. When the TFA9842AJ is in Mute, Volume

control or Operating mode (maximum gain) the input clamp voltage is 1 V (RMS).

8.2 Power amplifier

The power amplifier is a single-ended amplifier with an all NPN output stage, capable of

delivering a peak output current of 3 A.

8.2.1 Output power measurement

The output power as a function of the supply voltage is measured on the output pins at

THD = 10 %; see Figure 7. The maximum output power is limited by the supply voltage of

26 V and the maximum available output current is 3 A repetitive peak current. A minimum

load of 3 Ω is required for supply voltages > 22 V; see Figure 4. The output power is

measured with one channel driven.

TFA9842AJ_1

Preliminary specification

Rev. 01 — 28 April 2006

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.

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