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Philips
Philips

TFA9842AJ Datasheet

7.5W Stereo Power Amplifier


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TFA9842AJ
7.5 W stereo power amplifier with volume control
Rev. 01 — 28 April 2006
Preliminary specification
1. General description
The TFA9842AJ contains two identical audio power amplifiers. The TFA9842AJ can be
used as two Single-Ended (SE) channels with a volume control. The maximum gain is
26 dB.
The TFA9842AJ comes in a 9-pin DIL-bent-SIL (DBS9P) power package. The TFA9842AJ
is pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J and TFA9841J. The
difference between the TFA9843AJ and the TFA9843(B)J, TFA9842(B)J, TFA9841J is the
functionality of pin 7. The TFA9843AJ has a Volume Control (VC) on pin 7. The
TFA9843(B)J, TFA9842(B)J and TFA9841J have a mode select (MODE) on pin 7.
The TFA9842AJ contains a unique protection circuit that is solely based on multiple
temperature measurements inside the chip. This gives maximum output power for all
supply voltages and load conditions with no unnecessary audio holes. Almost any supply
voltage and load impedance combination can be made as long as thermal boundary
conditions (number of channels used, external heatsink and ambient temperature) allow
it.
2. Features
I 2 channel SE: 1 W to 7.5 W operation possibility
I Soft clipping
I Input clamps
I Volume control
I Standby and Mute mode
I No on or off switching plops
I Low standby current
I High supply voltage ripple rejection
I Outputs short-circuit protected to ground, supply and across the load
I Thermally protected
I Pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J and TFA9841J
3. Applications
I CRT TV and LCD TV
I Monitors
I PC speakers
I Boom box
I Mini and micro audio receivers
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TFA9842AJ
7.5 W stereo power amplifier with volume control
4. Quick reference data
Table 1. Quick reference data
Symbol Parameter
Conditions
Min Typ Max Unit
VCC
Iq
ICC(stb)
Po
THD
Gv(max)
Gv
supply voltage
quiescent current
standby supply current
output power
total harmonic distortion
maximum voltage gain
voltage gain range
operating
VCC = 17 V;
RL = ∞ Ω
VCC = 17 V;
VI(VC) < 0.8 V
THD = 10 %;
RL = 4 ;
VCC = 17 V
Po = 1 W
VI(VC) > 5.0 V
1.5 V < VI(VC) <
5.0 V
[1] 9
-
-
7
-
25
-
17 28 V
60 100 mA
- 150 µA
7.5 -
W
0.1 0.5 %
26 27 dB
80 -
dB
SVRR
supply voltage ripple
rejection
fripple = 1 kHz
[2] -
60 -
dB
[1] A minimum load of 3 is allowed at supply voltages > 22 V.
[2] Supply voltage ripple rejection is measured at the output, with a source impedance ZS = 0 at the input
and with a frequency range from 20 Hz to 22 kHz (unweighted). The ripple voltage is a sine wave with a
frequency fripple and an amplitude of 300 mV (RMS), which is applied to the positive supply rail.
5. Ordering information
Table 2. Ordering information
Type number Package
Name
Description
TFA9842AJ
DBS9P
plastic DIL-bent-SIL power package; 9 leads (lead
length 12/11 mm); exposed die pad
Version
SOT523 -1
TFA9842AJ_1
Preliminary specification
Rev. 01 — 28 April 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
2 of 18
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6. Block diagram
TFA9842AJ
7.5 W stereo power amplifier with volume control
4
IN1
60
k
VCC
9
8
OUT1
IN2 1
3
CIV
60
k
VC 7
VREF
VOLUME
CONTROL
TFA9842AJ
2 OUT2
SHORT-CIRCUIT
AND
TEMPERATURE
PROTECTION
VCC
0.5VCC
6 SVR
Fig 1. Block diagram
7. Pinning information
5
GND
001aae064
7.1 Pinning
IN2 1
OUT2 2
CIV 3
IN1 4
GND 5
SVR 6
VC 7
OUT1 8
VCC 9
TFA9842AJ
Fig 2. Pin configuration
001aae063
TFA9842AJ_1
Preliminary specification
Rev. 01 — 28 April 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
3 of 18
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w wPhwilip.s SDemaicot ndaucStorhs e e t 4 U . c o m
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-)-
Single-ended application: Ri = 60 kand Ci = 220 nF:
f i(3dB) = 2----π---(---6---0----×-----1---0---3---1-×-----2---2---0----×-----1---0------9--)- = 12 Hz
(1)
(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 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.
4 of 18
Page 4
Part Number TFA9842AJ
Manufactur Philips
Description 7.5W Stereo Power Amplifier
Total Page 18 Pages
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