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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8201AK
BTL Audio Power Amplifier
The TA8201AK is a audio power amplifier for consumer
application.
This IC is applying BTL system in which output coupling
condenser and bootstrap condenser are not necessary and output
17W (V
Since the package is a 7 pin SIP, (signal inline package), it
greatly simplifies construction of a power amplifier both in design
and assembly.
It also contains various kind of protector.
It is suitable for car−audio power amplifier with high
performance.
= 14.4V, BL =4Ω, THD = 10%) can be obtained.
CC
Features
· High power: P
· Very few external parts
· Built in protector circuit
Thermal shut down, over voltage protector (typ. V
ASO protector (R
· 7 pin small package
· Operating supply voltage range: V
OUT (1)
(V
: P
(V
= 17W (typ.)
= 14.4V, f = 1kHz, THD = 10%, RL = 4Ω)
CC
OUT (2)
= 14W (typ.)
= 13.2V, f = 1kHz, THD = 10%, RL = 4Ω)
CC
short, Out to GND, Out to VCC)
L
= 9~18V
CC
= 24V)
CC
Weight: 2.19g (typ.)
TA8201AK
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TA8201AK
Block Diagram
Directions For Use And Application Method
1. Voltage gain adjustment
This IC has the amplifier construction as shown in Fig.1. The pre-amp. Amp 1 is provided to the primary stage,
and the input voltage is amplified by the flat amps, amp 3 and amp 4 of each channel through the phase amp.
Amp 2.
Since the input offset is prevented by pre-amp when V
noise.
The total closed loop gain G
amp 1 is G
V1
.
G
V1
og20
=l
R
The closed loop voltage gain of power amp, amp 3 and amp 4 is fixed at G
Therefore, the total closed circuit voltage gain G
G
= GV1+GV3+6 (dB) ............. (2)
V
of this IC can be obtained by expression below when the closed loop voltage gain of
V
R2)
(RR1
++
f
R2
+
f
(dB)
..... (1)
＋
－
is set to on, this circuit can remarkable reduce the pop
CC
V3≒GV4
is obtained through BTL connection by the expression below.
V
= 20dB.
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TA8201AK
For example, when Rf = 0Ω, GV is obtained by
the expression below.
G
≒28+20+6 = 54 (dB)
V
The voltage gain is reduced when R
increased. (Fig.2)
With the voltage gain reduced, since (1) the
oscillation stability is reduced, and (2) the pop
noise changes when V
the items 2 and 4.
2. Capacitive value of input and NF capacitor
This IC has the built-in circuit which makes the input voltage of amp. 1 and the voltage of NF terminal equal at
V
→ on by means of providing the pre-amp (amp 1) at the first stage.
CC
Therefore, the off-set voltage produced at the first stage is suppressed, and the pop noise is prevented.
Set the capacitive value of input and NF capacitor according to the gain to be used.
[Reference] (A) At G
(B) At G
3. Capacitance of ripple filter capacitor
The capacitance of the ripple filter capacitor of (3) pin determines the time constant at V
Since the pop noise varies according to the capacitance of the ripple filter capacitor, C3 =220µF recommended.
Having the built-in rapid discharging circuit of ripple and NF voltage at the time when V
effective for preventing the pop noise of V
is set to on, refer to
CC
= 54dB (Rf = 0) CIN = 4.7µF, CNF = 47µF
V
= 40dB (Rf = 560Ω) CIN = 3.3µF, CNF = 33µF
V
f
is
continuous on / off.
CC
→ on and VCC → off.
CC
→ off, this IC is
CC
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TA8201AK
4. Preventive measure against oscillation
For preventing the oscillation, it is advisable to use C4, the condenser of polyester film having small
characteristic fluctuation of the temperature and the frequency.
The resistance R to be series applied to C4 is effective for phase correction of high frequency, and improves the
oscillation allowance.
Since the oscillation allowance is varied according to the causes described below, perform the temperature test to
check the oscillation allowance.
(1) Voltage gain to be used (G
(2) Capacity value condenser
(3) Kind of condenser
(4) layout of printed board
By increasing R
, decrease of GV is possible.
f
However, care must be taken since the feedback increase is liable to produce oscillation.
5 External part list and description
Symbol
C1 4.7µF DC blocking Related to popping noise at VCC → on
C2 47µF
C3 220µF
C4 0.15µF
C5 1000µF
Recommended
Value
setting)
V
Feature
Feedback
condenser
Ripple
reduction
Oscillation
prevention
Ripple
filter
1
f2
Influence
Larger Than
Recommended
fRL
Time constant is
large at V
Oscillation allowance
improved.
Value
CC
Smaller Than
Recommended
Value
Related to popping noise at VCC → on
Determination of low cut-off frequency.
C2×p=
Time constant is
small at V
or off.
Made liable to
oscillate.
For filtering power supply hum and ripple.
Large at using AC rectified power supply.
Small at using DC power supply.
CC
→ on
→ on or off.
Remarks
Related to gain.
Refer to item2.
Refer to item3.
Refer to item4.
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TA8201AK
Maximum Ratings
Characteristic Symbol Rating Unit
Peak supply voltage (0.2 sec) V
DC supply voltage V
Operating supply voltage V
Output current (peak) I
Power dissipation PD 15 W
Operating temperature T
Storage temperature T
(Ta = 25°C)
CC (surge)
25 V
CC (DC)
18 V
CC (opr)
4.5 A
O (peak)
-30~85 °C
opr
-55~150 °C
stg
50 V
Electrical Characteristics
(unless otherwise specified, VCC = 13.2V, RL = 4
Test
Characteristic Symbol
Quiescent current I
Output power
Total harmonic
distortion
Voltage gain GV ― Rf = 0Ω 52 54 56 dB
Output noise voltage VNO ― Rg = 10kΩ, BW = 20Hz~20kHz ― 0.9 2.0 mV
Ripple rejection ratio R.R. ― Fripple = 100Hz, Rg= 600Ω 40 50 ― dB
Input resistance RIN ― f = 1kHz ― 30 ― kΩ
Output offset voltage V
CCQ
P
OUT (1)
P
OUT (2)
THD ― P
offset
Cir-
cuit
― V
― V
― THD = 10% 10 14 ―
― V
Ω,
f = 1kHz, Ta = 25°C)
Test Condition Min. Typ. Max. Unit
= 0 ― 60 95 µA
IN
= 14.4V, THD = 10% ― 17 ―
CC
= 1W ― 0.05 0.4 %
OUT
= 0 -0.3 0 0.3 V
IN
Typical DC Voltage Of Each Terminal
(VCC = 13.2V, VIN = 0V, Ta = 25°C)
W
rms
Terminal No. 1 2 3 4 5 6 7
Terminal In NF R.F GND Out VCC Out
DC voltage (V) 4.55 4.55 4.55 0 5.6 13.2 5.6
Test Circuit / Applecation Circuit
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Package Dimensions
Weight: 2.19g (typ.)
TA8201AK
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TA8201AK
RESTRICTIONS ON PRODUCT USE
· 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.
000707EBF
· 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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