TA8261AH
2001-08-16
1
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8261AH
Max Power 40 W BTL 4CH Audio Power IC
The TA8261AH is 4 ch BTL audio power amplifier for car audio
application.
This IC can generate more high power: P
OUT
MAX = 40 W as it is
included the pure complementary PNP and NPN transistor
output stage.
It is designed low distortion ratio for 4 ch BTL audio power
amplifier, built-in Stand-by Function, Muting Function, Clip
detector, and diagnosis circuit.
Additionally, the AUX. amplifier is built-in, it can make the beep
signal etc. output to 2 channels (OUT1 and 4).
It contains various kind of protectors for car audio use.
Features
High power
: P
OUT
MAX (1) = 40 W (typ.)
(V
CC
= 14.4 V, f = 1 kHz, EIAJ max, R
L
= 4 )
: P
OUT
MAX (2) = 37 W (typ.)
(V
CC
= 13.7 V, f = 1 kHz, EIAJ max, R
L
= 4 )
: P
OUT
(1) = 27 W (typ.)
(V
CC
= 14.4 V, f = 1 kHz, THD = 10%, R
L
= 4 )
: P
OUT
(2) = 22 W (typ.)
(V
CC
= 13.2 V, f = 1 kHz, THD = 10%, R
L
= 4 )
Built-in clip detector & diagnosis circuit. (pin 25)
Built-in AUX. amplifier from single input to 2 channels output (pin 16)
Low distortion ratio
: THD = 0.02% (typ.)
(V
CC
= 13.2 V, f = 1 kHz, P
OUT
= 5 W, R
L
= 4 )
Low noise
: V
NO
= 0.10 mVrms (typ.)
(V
CC
= 13.2 V, R
g
= 0 , G
V
= 26dB, BW = 20 Hz~20 kHz)
Built-in stand-by switch function (pin 2)
Built-in muting function (pin 24)
Built-in various protection circuit
: Thermal shut down, over voltage, out to GND, out to V
CC
, out to out short
Operating supply voltage: V
CC (opr)
= 9~18 V
Weight: 9.8 g (typ.)
TA8261AH
2001-08-16
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Block Diagram
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2001-08-16
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Caution and Application Method
(description is made only on the single channel)
1. Voltage gain adjustment
This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can't adjusted, but it makes
the device a space and total costs saver.
Figure 1 Block diagram
The voltage gain of Amp. 1
: G
V1
= 0dB
The voltage gain of Amp. 2A, B
: G
V2
= 20dB
The voltage gain of BLT Connection : G
V (BTL)
= 6dB
Therefore, the total voltage gain is decided by expression below.
G
V
= G
V1
+ G
V2
+ G
V (BTL)
= 0 + 20 + 6 = 26dB
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2001-08-16
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2. Stand-by SW function
(pin 2)
By means of controlling pin 2 (Stand-by terminal) to
High and Low, the power supply can be set to ON and
OFF.
The threshold voltage of pin 2 is set at about 3 V
BE
(typ.), and the Power Supply current is about 2 A
(typ.) at the stand-by state.
Control voltage of pin 2: V
(SB)
Stand-By Power V
(SB)
(V)
ON OFF 0~1.5
OFF ON 3~V
CC
Adjustage of stand-by SW
(1) Since
V
CC
can directly be controlled to ON or OFF by the microcomputer, the switching relay can be
omitted.
(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory
for switching
Conventional method
Stand-by switch method
Figure 3
Figure 2 With pin 2 set to High, power
is turned ON
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2001-08-16
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3. Muting
function
(pin 24)
By means of controlling pin 24 less than 0.5 V, it can make the audio muting condition.
The muting time constant is decided by R
1
and C
4
and these parts is related the pop noise at power
ON/OFF.The series resistance; R
1
must be set up less than 15 k, we recommend 10 k.
The muting function have to be controlled by a transistor, FET and -COM port which has I
MUTE
250 A
ability.
Terminal 24 must not be pulled up and it shall be controlled by OPEN/LOW.
Figure 4 Muting function
Figure 5 Mute attenuation-V
mute
(V)
4. AUX.
input
(pin 16)
The pin 16 is for input terminal of AUX. amplifier.
The total gain is 0dB by using of AUX. amplifier.
Therefore, the -COM can directly drive the AUX. amplifier.
BEEP sound or voice synthesizer signal can be input to pin 16 directly.
Figure 6 AUX. input
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5. Diagnosis
output
(pin 25)
The diagnosis output terminal of pin 25 has open collector output structure on chip as shown in Figure 7.
In case diagnosis circuit that detect unusual case is operated, NPN Tr. (Q1) or (Q2) is turned on.
It is possible to protect all the system of apparatus as well as power IC protection.
In case of being unused this function, use this IC as open-connection on pin 25.
pin 25: Open collector output (active low)
Figure 7 Self diagnosis output
5.1
In case of over voltage power supplied.
NPN Tr. (Q1) is turned on.
Threshold of over voltage protection: V
CC
= 22 V (typ.)
Figure 8 Application 1
5.2
In case of shorting output to V
CC
/GND
NPN Tr. (Q2) is turned on.
Additionally, in case of shorting OUT to GND, NPN Tr. (Q1) is turned on with (Q2), because output
offset voltage detector is operated at this condition.
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2001-08-16
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5.3
In case of shorting output to output
NPN Tr. (Q2) is turned on and off in response to the input signal voltage.
5.4
In case of appearing output offset voltage by generating a large leakage current
on the input capacitor etc.
NPN Tr. (Q1) is turned on while the inverted output voltage level become less than the threshold level
of output offset voltage detector.
Figure 9 Application and detection mechanism
Figure 10 Wave form
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2001-08-16
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6. Output clip detection function
(pin 25)
The output clip detection terminal of pin 25 has the open collector output structure on chip as shown in
Figure 11. In case that the output waveform is clipping, the clip detection circuit is operated and NPN Tr.
(Q2) is turned on.
It is possible to improve the audio quality with controlling the volume, tone control circuit through L.P.F.
smoothing circuit as shown in Figure 11.
In case of being unused this function, use this IC as open connection on pin 25.
(Application)
pin 25: Open collector output (active low)
Figure 11
(A) Output (AC wave form)
(B) Clip detector circuit (internal)
(C) Clip DET. terminal (pin 25)
*: Actually, the waveform is solid line because the output offset voltage detection, which is a kind of the self
diagnosis, has priority.
Figure 12 Clip detection
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7. Cross
talk
The cross talk characteristics of the IC is not good between OUT1 and 2, OUT3 and 4.
So we recommend to use by below method.
OUT1, 2
L-ch (or R-ch)
OUT3, 4
R-ch (or L-ch)
And, please refer to below table in case of applying the AUX. IN because it is out to OUT1 and 4.
ex) In case of the signal from AUX. IN to front speakers.
OUT1 Front
AUX.
OUT
OUT2 Rear
L-ch (or R-ch)
OUT3 Rear
OUT4 Front
R-ch (or L-ch)
AUX. OUT
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Maximum Ratings
(Ta = 25C)
Characteristics Symbol
Rating
Unit
Peak supply voltage (0.2 s)
V
CC (surge)
50 V
DC supply voltage
V
CC (DC)
25 V
Operating supply voltage
V
CC (opr)
18
V
Output current (peak)
I
O (peak)
9 A
Power dissipation
P
D
(Note 1)
250
W
Operating temperature
T
opr
-40~85 C
Storage temperature
T
stg
-55~150 C
Note 1: Package thermal resistance
j-T
= 0.5C/W (typ.)
(Ta = 25C, with infinite heat sink)
Electrical Characteristics
(unless otherwise specified, V
CC
= 13.2 V, f = 1 kHz, R
L
= 4 , Ta = 25C)
Characteristics Symbol
Test
Circuit
Test Condition
Min
Typ.
Max
Unit
Quiescent current
I
CCQ
V
IN
= 0
200 400
mA
P
OUT
MAX (1)
V
CC
= 14.4 V, MAX power
40
P
OUT
MAX (2)
V
CC
= 13.7 V, MAX power
37
P
OUT
(1)
V
CC
= 14.4 V, THD = 10%
27
Output power
P
OUT
(2)
THD
=
10%
20
22
W
Total harmonic distortion
THD
P
OUT
= 5 W
0.02 0.2 %
Voltage gain
G
V
V
OUT
= 0.775 Vrms (0dBm)
24
26
28
dB
Voltage gain ratio
G
V
V
OUT
= 0.775 Vrms (0dBm)
-1.0 0 1.0 dB
V
NO
(1)
R
g
= 0 , DIN45405
0.12
Output noise voltage
V
NO
(2)
R
g
= 0 , BW = 20 Hz~20 kHz
0.10 0.35
mVrms
Ripple rejection ratio
R.R.
f
rip
= 100 Hz, R
g
= 620
V
rip
= 0.775 Vrms (0dBm)
40 50 dB
Cross talk
C.T.
R
g
= 620 ,
V
OUT
= 0.775 Vrms (0dBm)
70 dB
Output offset voltage
V
OFFSET
-100 0 100
mV
Input resistance
R
IN
90
k
Stand-by current
I
SB
Stand-by
condition
2 10 A
V
SB
H
Power:
on
3.0
V
CC
Stand-by control voltage
V
SB
L
Power:
off
0
1.5
V
V
M
H
Mute:
off
OPEN
Mute control voltage (Note 2)
V
M
L
Mute:
on,
R
1
= 10 k 0
0.5 V
Mute attenuation
ATT M
Mute: on, V
OUT
= 7.75 Vrms (20dBm)
at Mute: off.
80 90 dB
Note 2: Muting function have to be controlled by open and Low Logic, which Logic is a transistor, FET and -COM
port of I
MUTE
250 A ability.
This means that the Mute control terminal: pin 24 must not be pulled-up.
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2001-08-16
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Test Circuit
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TA8261AH
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TA8261AH
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TA8261AH
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Package Dimensions
Weight: 9.8 g (typ.)
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2001-08-16
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000707EBF
RESTRICTIONS ON PRODUCT USE
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