TA8276HQ
2004-05-10
1
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8276HQ
Max Power 35 W BTL 4 ch Audio Power IC
The TA8276HQ is 4 ch BTL audio power amplifier for car audio
application.
This IC can generate more high power: P
OUT
MAX = 35 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, output
clipping detection and diagnosis circuit which can detect output
to V
CC
/GND short and over voltage input mode.
Additionally, the AUX amplifier and various kind of protector
for car audio use are built-in.
Features
High power : P
OUT
MAX (1) = 35 W (typ.)
(V
CC
= 14.4 V, f = 1 kHz, JEITA max, R
L
= 4 )
:
P
OUT
MAX (2) = 31 W (typ.)
(V
CC
= 13.7 V, f = 1 kHz, JEITA max, R
L
= 4 )
:
P
OUT
(1) = 23 W (typ.)
(V
CC
= 14.4 V, f = 1 kHz, THD = 10%, R
L
= 4 )
:
P
OUT
(2) = 20 W (typ.)
(V
CC
= 13.2 V, f = 1 kHz, THD = 10%, R
L
= 4 )
Built-in output clipping detection and diagnosis circuit (pin 25)
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.)
1.
(V
CC
= 13.2 V, R
g
= 0 , G
V
= 26 dB, BW = 20 Hz~20 kHz)
Built-in stand-by switch (pin 4)
Built-in muting function (pin 22)
Built-in AUX amplifier from single input to 2 channels output (pin 16)
Built-in various protection circuit
: Thermal shut down, over voltage, out to GND, out to V
CC
, out to out short, speaker burned
Operating supply voltage: V
CC (opr)
= 9~18 V
Note 1: Install the product correctly. Otherwise, it may result in break down, damage and/or degradation to the
product or equipment.
Note 2: These protection functions are intended to avoid some output short circuits or other abnormal conditions
temporarily. These protect functions do not warrant to prevent the IC from being damaged.
- In case of the product would be operated with exceeded guaranteed operating ranges, these
protection features may not operate and some output short circuits may result in the IC being
damaged.
Weight: 7.7 g (typ.)
TA8276HQ
2004-05-10
2
Block Diagram
Note3: Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for
explanatory purpose.
R
L
R
L
R
L
11
9
8
7
5
2
3
17
18
19
21
24
23
12
15
14
1
20
6
R
L
IN1
IN2
IN3
AUX IN
IN4
13
16
C
1
C
1
C
1
C
1
PRE-GND
10
25
4
22
OUT1 (
+
)
PW-GND1
OUT1 (
-
)
OUT2 (
+
)
PW-GND2
OUT2 (
-
)
OUT3 (
+
)
PW-GND3
OUT3 (
-
)
OUT4 (
+
)
PW-GND4
OUT4 (
-
)
TAB
V
CC1
V
CC2
C
3
R
1
C
4
C
2
: PRE-GND
: PW-GND
STBY
CLIP OUT
&
DIAGNOSIS
OUT
RIP MUTE
C
5
C
6
TA8276HQ
2004-05-10
3
Figure 2 With pin 4 set to High,
Power is turned ON
ON
4
OFF
10 k
to BIAS
CUTTING CIRCUIT
2V
BE
V
CC
Power
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.
The voltage gain of Amp.1:
G
V1
= 0 dB
The voltage gain of Amp.2A, B:
G
V2
= 20 dB
The voltage gain of BLT Connection: G
V (BTL)
= 6 dB
Therefore, the total voltage gain is decided by expression below.
G
V
= G
V1
+ G
V2
+ G
V (BTL)
= 0 + 20 + 6 = 26 dB
2. Stand-by SW Function
(pin 4)
By means of controlling pin 4 (stand-by terminal)
to high and low, the power supply can be set to ON
and OFF. The threshold voltage of pin 4 is set at
about 3V
BE
(typ.), and the power supply current is
about 2
A (typ.) at the stand-by state.
Control Voltage of pin 4: 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
Amp. 1
Input
Amp. 2A
Amp. 2B
Figure 1 Block Diagram
TA8276HQ
2004-05-10
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3. Muting
Function
(pin 22)
By means of controlling pin 22 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; R1 must be set up less than 10 k
to get enough muting attenuation.
The muting function have to be controlled by a transistor, FET and
-COM port which has I
MUTE
> 250 A
ability.
Pin 22 terminal voltage has the temperature characteristics of 4.6 V (low temperature) to 3.2 V (high
temperature).
Therefore, it is need to design with attention as using the microcontroller of which operating voltage is less
than 5 V.
Terminal 22 may not be pulled up and shall be controlled by OPEN/LOW.
When it is obliged to do, it must be pulled up via diode, because it has to defend flowing reverse current to
internal circuit of pin 22.
Conventional Method
V
CC
Large current capacity switch
BATTERY
V
CC
FROM
MICROCOMPUTER
BATTERY
RELAY
V
CC
Small current capacity switch
BATTERY
Stand-By
V
CC
DIRECTLY FROM
MICROCOMPUTER
BATTERY
Stand-By
Stand-by Switch Method
Figure 3
Figure 5 Mute Attenuation
-
V
MUTE
(V)
Point A voltage: VMUTE (V)
ATT V
MUTE
Mute
a
t
tenua
tion
ATT (dB
)
10 k
5 k
VCC
=
13.2 V
Po
=
10 W
PL
=
4
f
=
1 kHz
BW
=
400~30 kHz
-
100
0
0.4
0.8 1 1.2
1.6 2 2.4 2.8
3
-
80
-
60
-
40
-
20
0
20
Figure 4 Muting Function
R
1
I (100
A)
22
I
MUTE
I
MUTE (OFF)
A
V
MUTE
C
4
<Recommended Application>
<Application for pulled up>
R
1
I (100
A)
22
I
MUTE
I
MUTE (OFF)
V
MUTE
C
4
TA8276HQ
2004-05-10
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4. AUX
Input
(pin 16)
The pin 16 is for input terminal of AUX
amplifier.
The total gain is 0 dB 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.
When AUX function is not used, this pin must be
connected to PRE-GND (pin 13) via a capacitor.
5.
Diagnosis Output
(pin 25)
This 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) 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.
5.1
In Case of Shorting Output to V
CC
/GND or Over Voltage Power Supplied
NPN Tr. (Q1) is turned on.
Threshold of over voltage protection: V
CC
= 22 V (typ.)
5.2
In Case of Shorting Output to Output
NPN Tr. (Q1) is turned on and off in response to the input signal voltage.
25
5 V
LED/LCD
ALAME
REGULATOR
OFF
(Flashing)
(Announcement from a speaker.)
(Relay
OFF)
-COM
MEMORY (Count and record)
Figure 8 Application 1
Figure 7 Self Diagnosis Output
OUTPUT CLIP
DETECTOR
OUTPUT SHORT
PROTECTOR
OVER VOLTAGE
PROTECTOR
25
Q1
5 V
pin 25: Open collector output (active low)
Q1 is turned on
GND
5 V
t
V25
Figure 6 AUX Input
20 dB AMP.
IN
OUT (
+
)
OUT (
-
)
16
AUX-IN
-
20 dB
AUX AMP
-COM
TA8276HQ
2004-05-10
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5.3
Prevention of speaker burning accident (In Case of Rare Short Circuit of Speaker)
When the direct current resistance between OUT
+ and OUT - terminal becomes 1 or less and output
current over 4 A flows, this IC makes a protection circuit operate and suppresses the current into a speaker.
This system makes the burning accident of the speaker prevent as below mechanism.
<The guess mechanism of a burning accident of the speaker>
Abnormal output offset voltage (voltage between OUT
+ and OUT -) over 4 V is made by the external
circuit failure.(Note 4)
The speaker impedance becomes 1
or less as it is in a rare short circuit condition.
The current more than 4 A flows into the speaker and the speaker is burned.
Note 4: It is appeared by biased input DC voltage
(for example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.)
5.4 Applications
When output terminals short-circuit to V
CC
or GND, the voltage of 25pin is fixed to "L".
And when shorting OUT
+ to OUT -, "L" and "H" are switched according to an input signal.
Therefore, it is possible to judge how the power IC condition is if a micro-controller detects the
25pin voltage that is smoothed out with LPF.
It is recommend that the threshold voltage (Vth) is set up as higher as possible because output level
of LPF is changed according to an input signal.
(for example, Vth is set up to 4 V if 25pin is pulled up to 5 V line.)
Current into a speaker
Speaker impedance
Less than 4
Figure 9
About 1
4
Operating point of protector
Output voltage of L.P.F.
Output power
5 V
Figure 10
Operating point of protector
TA8276HQ
2004-05-10
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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. 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.
(A)
5 V
t
AC
(A) Output (AC wave form)
(B)
t
DC
(B) Clip Detector Circuit
(internal)
(C)
t
DC
(B) Clip Detector Terminal
(pin 25)
GND
Figure 12 Clip Detection
Figure 11
pin 25: Open collector output (active low)
OUTPUT CLIP
DETECTOR
25
5 V
L.P.F.
SMOOTHING
CIRCUIT
VOLUME CONTROL CIRCUIT
TONE CONTROL CIRCUIT
(Application)
TA8276HQ
2004-05-10
8
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
Operation supply voltage
V
CC (opr)
18 V
Output current (peak)
I
O (peak)
9 A
Power dissipation
P
D
(Note 5)
125
W
Operation temperature
T
opr
-
40~85 C
Storage temperature
T
stg
-
55~150 C
Note 5: Package thermal resistance
j-T
=
1C/W (typ.)
(Ta
=
25C, with infinite heat sink)
The absolute maximum ratings of a semiconductor device are a set of specified parameter values, which must not
be exceeded during operation, even for an instant. If any of these rating would be exceeded during operation, the
device electrical characteristics may be irreparably altered and the reliability and lifetime of the device can no
longer be guaranteed. Moreover, these operations with exceeded ratings may cause break down, damage and/or
degradation to any other equipment. Applications using the device should be designed such that each maximum
rating will never be exceeded in any operating conditions. Before using, creating and/or producing designs, refer to
and comply with the precautions and conditions set forth in this documents.
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
35
P
OUT
MAX (2)
V
CC
=
13.7 V, max Power
31
P
OUT
(1)
V
CC
=
14.4 V, THD
=
10%
23
Output power
P
OUT
(2)
THD
=
10%
17
20
W
Total harmonic distortion
THD
P
OUT
=
5 W
0.02 0.2 %
Voltage gain
G
V
V
OUT
=
0.775 V
rms
(0 dBm)
24
26
28
Voltage gain ratio
G
V
V
OUT
=
0.775 V
rms
(0 dBm)
-
1.0 0 1.0
dB
V
NO
(1)
Rg
=
0
, DIN45405
0.12
Output noise voltage
V
NO
(2)
Rg
=
0
, BW
=
20 Hz~20 kHz
0.10 0.35
mV
rms
Ripple rejection ratio
R.R.
f
rip
=
100 Hz, Rg
=
620
V
rip
=
0.775 V
rms
(0 dBm)
40 50
dB
Cross talk
C.T.
Rg
=
620
V
OUT
=
0.775 V
rms
(0 dBm)
65
dB
Output offset voltage
V
OFFSET
-
150 0 150
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 (20 dBm) 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 than the mute control terminal : pin 22 must not be pulled-up.
TA8276HQ
2004-05-10
9
Test Circuit
Components in the test circuits are only used to obtain and confirm the device characteristics.
These components and circuits do not warrant to prevent the application equipment from malfunction or failure.
R
L
R
L
R
L
11
9
8
7
5
2
3
17
18
19
21
24
23
12
15
14
1
20
6
R
L
IN1
IN2
IN3
IN4
13
C
1
C
1
C
1
C
1
PRE-GND
10
25
4
22
OUT1 (
+
)
PW-GND1
OUT1 (
-
)
OUT2 (
+
)
PW-GND2
OUT2 (
-
)
OUT3 (
+
)
PW-GND3
OUT3 (
-
)
OUT4 (
+
)
PW-GND4
OUT4 (
-
)
TAB
V
CC1
V
CC2
C
3
R
1
C
4
1
F
C
2
: PRE-GND
: PW-GND
STBY
CLIP OUT
&
DIAGNOSIS
OUT
RIP MUTE
3900
F
0.22
F
0.22
F
0.22
F
10
F
10 k
C
5
0.1
F
0.22
F
AUX IN
16
0.22
F
C
6
TA8276HQ
2004-05-10
10
Quiescen
t curr
ent
I
CCQ
(mA)
Output power P
OUT
(W)
T.H.D P
OUT
T
o
t
a
l
harmoni
c
di
stortion
T
.
H.D (
%
)
Power supply voltage VCC (V)
I
CCQ
V
CC
Frequency f (Hz)
T.H.D f
T
o
t
a
l
harmoni
c
di
stortion
T
.
H.D (
%
)
Output power P
OUT
(W)
T.H.D P
OUT
T
o
t
a
l
harmoni
c
di
stortion
T
.
H.D (
%
)
10
0
30
0
400
20
100
200
300
RL
=
VIN
=
0
100
10
100 k
0.001
1
1 k
0.01
0.1
10 k
OUT2
OUT1
OUT4
OUT3
VCC
=
13.2 V
RL
=
4
Pout
=
5 W
0.1
100
0.01
1
0.1
1
10
10
100
10 kHz
1 kHz
100 Hz
VCC
=
13.2 V
RL
=
4
0.1
100
0.01
1
0.1
1
10
10
100
13.2 V
16.0 V
9.0 V
f
=
1 kHz
RL
=
4
TA8276HQ
2004-05-10
11
Cro
s
s
t
a
l
k
C
.
T
.
(
d
B)
Cro
s
s
t
a
l
k
C
.
T
.
(
d
B)
Signal source resistance Rg (
)
V
NO
R
g
O
u
t
p
ut
n
o
i
se
v
o
l
t
age
V
NO
(
V
rms
)
Frequency f (Hz)
R.R. f
Ripple
reje
ction
ra
ti
o
R.R.
(dB)
Frequency f (Hz)
C.T. f (OUT1)
Cro
s
s
t
a
l
k
C
.
T
.
(
d
B)
Frequency f (Hz)
C.T. f (OUT2)
Frequency f (Hz)
C.T. f (OUT3)
Frequency f (Hz)
C.T. f (OUT4)
Cro
s
s
t
a
l
k
C
.
T
.
(
d
B)
100
10
100 k
-
70
0
1 k
-
60
-
30
10 k
-
40
-
20
-
50
-
10
VCC
=
13.2 V
VOUT
=
0.775 Vrms (0 dBm)
Rg
=
620
RL
=
4
OUT1
OUT2, 3
OUT1
OUT4
100
10
100 k
-
70
0
1 k
-
60
-
30
10 k
-
40
-
20
-
50
-
10
VCC
=
13.2 V
VOUT
=
0.775 Vrms (0 dBm)
Rg
=
620
RL
=
4
OUT2
OUT1
OUT2
OUT3, 4
100
10
100 k
-
70
0
1 k
-
60
-
30
10 k
-
40
-
20
-
50
-
10
VCC
=
13.2 V
RL
=
4
Rg
=
620
Vrip
=
0dBm
100
10
100 k
-
70
0
1 k
-
60
-
30
10 k
-
40
-
20
-
50
-
10
VCC
=
13.2 V
RL
=
4
VOUT
=
0dBm
Rg
=
620
OUT3
OUT4
OUT3
OUT2
OUT3
OUT1
OUT4
OUT1, 2
100
10
100 k
-
70
0
1 k
-
60
-
30
10 k
-
40
-
20
-
50
-
10
VCC
=
13.2 V
RL
=
4
VOUT
=
0dBm
Rg
=
620
OUT4
OUT3
100
10
100 k
0
300
1 k
50
200
10 k
100
150
250
VCC
=
13.2 V
RL
=
4
BW
=
20 Hz~20 kHz
TA8276HQ
2004-05-10
12
Frequency f (Hz)
G
V
f
V
o
lt
age
gai
n
G
V
(dB)
Output power P
OUT
/ch (C)
P
D
P
OUT
Power
di
ssip
ation
P
D
(W)
Ambient temperature Ta (C)
P
D
MAX Ta
Allowa
ble power
d
i
ssip
a
tion
P
D
MAX.
(w
)
25
0
150
0
120
75
60
100
40
20
80
100
50 125
INFINITE HEAT SINK
R
JC
=
1C/W
HEAT SINK (R
HS
=
3.5C/W)
R
JC
+
R
HS
=
4.5C/W
NO HEAT SINK
R
JA
=
39C/W
100
10
100 k
0
40
1 k
5
20
10 k
15
25
10
30
35
VCC
=
13.2 V
RL
=
4
VOUT
=
0.775 Vrms (0 dBm)
0
10
40
30
50
20
60
70
5
15 20
10
25
0
9 V
13.2 V
16 V
f
=
1 kHz
RL
=
4
TA8276HQ
2004-05-10
13
Package Dimensions
Weight: 7.7 g (typ.)
TA8276HQ
2004-05-10
14
The information contained herein is subject to change without notice.
The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of
TOSHIBA or others.
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.
The products described in this document are subject to the foreign exchange and foreign trade laws.
TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced
and sold, under any law and regulations.
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.
030619EBF
RESTRICTIONS ON PRODUCT USE
About solderability, following conditions were confirmed
Solderability
(1) Use of Sn-63Pb solder Bath
solder bath temperature
=
230C
dipping time
=
5 seconds
the number of times
=
once
use of R-type flux
(2) Use of Sn-3.0Ag-0.5Cu solder Bath
solder bath temperature
=
245C
dipping time
=
5 seconds
the number of times
=
once
use of R-type flux
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