TFA9843J データシートの表示（PDF） - NXP Semiconductors.

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TFA9843J

2-channel audio amplifier (SE: 1 W to 20 W or BTL: 4 W to 40 W)

NXP Semiconductors. 

Philips Semiconductors

TFA9843J

2-channel audio amplifier (2 x SE or 1 x BTL)

7.2 Pin description

Table 3:

Symbol

IN2+

OUT2−

CIV

IN1+

GND

SVR

MODE

OUT1+

VCC

Pin description

Pin

1

2

3

4

5

6

7

8

9

Description

input 2

inverted loudspeaker terminal 2

common input voltage decoupling

input 1

ground

half supply voltage decoupling (ripple rejection)

mode selection input (standby, mute and operating)

non inverted loudspeaker terminal 1

supply voltage

8. Functional description

8.1 Input configuration

The input cut-off frequency is:

9397 750 12587

Preliminary data

f i(cut – off ) = 2----π---(---R---1-i---×----C-----i-)-

(1)

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

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

(2)

Bridge-tied load application: Ri = 30 kΩ and Ci = 470 nF:

f i(cut – off ) = -2---π---(---3---0----×-----1---0---3---1-×-----4---7---0----×-----1---0---–---9--)- = 11 Hz

(3)

As shown in Equation 2 and Equation 3, large capacitor values for the inputs are not

necessary; so the 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.

8.2 Power amplifier

The power amplifier is a Bridge-Tied Load (BTL) or Single-Ended (SE) amplifier with

an all-NPN output stage, capable of delivering a peak output current of 4 A.

Using the TFA9843J as a BTL amplifier offers the following advantages:

• Lower peak value of the supply current

• Ripple frequency on the supply voltage is twice the signal frequency

Rev. 02 — 19 January 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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