TOSHIBA TA8261AH

TA8261AH
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: POUT 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
: POUT MAX (1) = 40 W (typ.)
(VCC = 14.4 V, f = 1 kHz, EIAJ max, RL = 4 Ω)
: POUT MAX (2) = 37 W (typ.)
(VCC = 13.7 V, f = 1 kHz, EIAJ max, RL = 4 Ω)
: POUT (1) = 27 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
: POUT (2) = 22 W (typ.)
(VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
·
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.)
(VCC = 13.2 V, f = 1 kHz, POUT = 5 W, RL = 4 Ω)
·
Low noise
: VNO = 0.10 mVrms (typ.)
(VCC = 13.2 V, Rg = 0 Ω, GV = 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 VCC, out to out short
·
Operating supply voltage: VCC (opr) = 9~18 V
Weight: 9.8 g (typ.)
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Block Diagram
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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
: GV1 = 0dB
The voltage gain of Amp. 2A, B
: GV2 = 20dB
The voltage gain of BLT Connection : GV (BTL) = 6dB
Therefore, the total voltage gain is decided by expression below.
GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26dB
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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 VBE
(typ.), and the Power Supply current is about 2 µA
(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~VCC
Figure 2 With pin 2 set to High, power
is turned ON
Adjustage of stand-by SW
(1) Since VCC 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
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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 R1 and C4 and these parts is related the pop noise at power
ON/OFF.The series resistance; R1 must be set up less than 15 kΩ, we recommend 10 kΩ.
The muting function have to be controlled by a transistor, FET and µ-COM port which has IMUTE ≥ 250 µA
ability.
Terminal 24 must not be pulled up and it shall be controlled by OPEN/LOW.
Figure 4 Muting function
Figure 5 Mute attenuation−Vmute (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 µ-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: VCC = 22 V (typ.)
Figure 8 Application 1
5.2
In case of shorting output to VCC/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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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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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
OUT2
Rear
OUT3
Rear
OUT4
Front
L-ch (or R-ch)
R-ch (or L-ch)
9
AUX. OUT
―
―
AUX. OUT
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TA8261AH
Maximum Ratings (Ta = 25°C)
Characteristics
Symbol
Rating
Unit
VCC (surge)
50
V
DC supply voltage
VCC (DC)
25
V
Operating supply voltage
VCC (opr)
18
V
Peak supply voltage (0.2 s)
Output current (peak)
IO (peak)
9
A
PD (Note 1)
250
W
Operating temperature
Topr
−40~85
°C
Storage temperature
Tstg
−55~150
°C
Power dissipation
Note 1: Package thermal resistance θj-T = 0.5°C/W (typ.)
(Ta = 25°C, with infinite heat sink)
Electrical Characteristics
(unless otherwise specified, VCC = 13.2 V, f = 1 kHz, RL = 4 Ω, Ta = 25°C)
Characteristics
Quiescent current
Output power
Total harmonic distortion
Voltage gain
Voltage gain ratio
Symbol
Test
Circuit
ICCQ
―
POUT
MAX (1)
Test Condition
Min
Typ.
Max
Unit
VIN = 0
―
200
400
mA
―
VCC = 14.4 V, MAX power
―
40
―
POUT
MAX (2)
―
VCC = 13.7 V, MAX power
―
37
―
POUT (1)
―
VCC = 14.4 V, THD = 10%
―
27
―
POUT (2)
―
THD = 10%
20
22
―
THD
―
POUT = 5 W
―
0.02
0.2
%
GV
―
VOUT = 0.775 Vrms (0dBm)
24
26
28
dB
dB
W
∆GV
―
VOUT = 0.775 Vrms (0dBm)
−1.0
0
1.0
VNO (1)
―
Rg = 0 Ω, DIN45405
―
0.12
―
VNO (2)
―
Rg = 0 Ω, BW = 20 Hz~20 kHz
―
0.10
0.35
Ripple rejection ratio
R.R.
―
frip = 100 Hz, Rg = 620 Ω
Vrip = 0.775 Vrms (0dBm)
40
50
―
dB
Cross talk
C.T.
―
Rg = 620 Ω,
VOUT = 0.775 Vrms (0dBm)
―
70
―
dB
VOFFSET
―
―
−100
0
100
mV
Input resistance
RIN
―
―
―
90
―
kΩ
Stand-by current
ISB
―
Stand-by condition
―
2
10
µA
VSB H
―
Power: on
3.0
―
VCC
VSB L
―
Power: off
0
―
1.5
VM H
―
Mute: off
VM L
―
Mute: on, R1 = 10 kΩ
0
―
0.5
V
ATT M
―
Mute: on, VOUT = 7.75 Vrms (20dBm)
at Mute: off.
80
90
―
dB
Output noise voltage
Output offset voltage
Stand-by control voltage
Mute control voltage
Mute attenuation
(Note 2)
OPEN
mVrms
V
―
Note 2: Muting function have to be controlled by open and Low Logic, which Logic is a transistor, FET and µ-COM
port of IMUTE ≥ 250 µA ability.
This means that the Mute control terminal: pin 24 must not be pulled-up.
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Test Circuit
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Package Dimensions
Weight: 9.8 g (typ.)
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RESTRICTIONS ON PRODUCT USE
000707EBF
· TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability
Handbook” etc..
· The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this
document shall be made at the customer’s own risk.
· This product generates heat during normal operation. However, substandard performance or malfunction may
cause the product and its peripherals to reach abnormally high temperatures.
The product is often the final stage (the external output stage) of a circuit. Substandard performance or
malfunction of the destination device to which the circuit supplies output may cause damage to the circuit or to the
product.
· The products described in this document are subject to the foreign exchange and foreign trade laws.
· The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other
rights of the third parties which may result from its use. No license is granted by implication or otherwise under
any intellectual property or other rights of TOSHIBA CORPORATION or others.
· The information contained herein is subject to change without notice.
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