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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8229K
Low Frequency Power Amplifier
TA8229K is an audio power IC with built-in two channels
developed for portable radio cassette tape recorder with power
ON/OFF switch. Thermal shut down protection circuit is built in.
Features
· High power
: P
(VCC = 9 V, RL = 4 Ω, f = 1 kHz, THD = 10%)
P
(VCC = 12 V, RL = 3 Ω, f = 1 kHz, THD = 10%)
· Low popping noise at power ON
· Small quiescent current
: I
· Soft clip
· Built-in thermal shut down protection circuit
· Best for supply voltage 9 V, 12 V
· Operation supply voltage range: V
= 2.5 W (typ.)
out (1)
= 4.6 W (typ.)
out (2)
= 21 mA (typ.) (VCC = 15 V, Vin = 0)
CCQ
CC (opr)
Weight: 3.9 g (typ.)
= 6~15 V (Ta = 25°C)
TA8229K
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Block Diagram
TA8229K
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Application Information and Application Method
1. Adjustment of voltage gain
The voltage gain Gv is obtained as follows by R1, R2 and Rf in Figure 1.
G
v
When Rf = 0 Ω Gv = 56.5dB (typ.)
When R
By increasing R
oscillation, it is recommended to use this at 40dB or over.
R
og20=
l
= 120 Ω Gv = 45dB (typ.)
f
2. Thermal shut-down circuit
The thermal shut-down circuit is built in for the purpose of preventing the destruction of IC due to the
abnormal temperature rise when the heat radiation is insufficient.
The operation temperature is set at radiation Fin temperature 175°C (typ.).
At this temperature or over the bias is interrupted to prevent the destruction of IC.
3. Input stage
The input circuit of this IC is as shown in Figure 2.
PNP Tr: Q1 is provided in the input circuit so as to make its usage possible without the input coupling
capacitor.
However, at pin11 and 12, max 60 mV offset voltage is produced.
Application after checking volume slide noise is recommended.
For cutting the volume slide noise, insert the input capacitor: C
R2+R1+
f
R
f
R1+
Figure 1
, reduction of Gv is possible. However, since the feedback increase is liable to produce
f
TA8229K
in series to interrupt the DC component.
IN
Figure 2
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TA8229K
4. Oscillation preventive measures
For oscillation preventive capacitor C6 and C7 between the output terminal and GND, it is recommended
to use polyester film capacitor having good characteristics for temperature and for high frequency.
Since the characteristics of the ceramic capacitor is liable to be influenced by the temperature, use this
capacitor after the temperature test to check the oscillation allowance.
In addition, as the position of the electrolytic capacitor has a remarkable influence on the oscillation,
connect C10 to V
At using this application with the voltage gain reduced, oscillation is liable to be produced. Apply the
capacitor after checking enough for its capacity, type and mounting position.
Note 1: As the oscillation allowance varies according to the printed pattern layout, the standard printed board
of TOSHIBA is recommended to be referred to design it.
at the nearest possible position from power GND.
CC
5. Power ON/OFF switch
There is power ON/OFF switch at pin 8. However, output power is changed by pin 8 supply voltage when
pin 4 supply voltage is not same pin 8 supply voltage, after referring to attached data, select pin 8 supply
voltage.
6. Input voltage
When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is
V
= 300 mVrms (typ.) : VCC = 9 V, RL = 4 Ω, f = 1 kHz: Enough care must be taken for this phenomenon.
in
Maximum Ratings
(Ta = 25°C)
(Note 1)
Characteristics Symbol Rating Unit
Supply voltage VCC 20 V
Output current (peak/CH) I
Power dissipation PD (Note 2) 15.0 W
Operating temperature T
Storage temperature T
Note 2: Derated above Ta = 25°C in the proportion of 120 mW/°C.
2.5 A
O (peak)
−20~75 °C
opr
−55~150 °C
stg
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TA8229K
Electrical Characteristics
(unless otherwise specified, VCC = 9 V, RL = 4 Ω, Rg = 600 Ω, f = 1 kHz, Ta = 25°C, Rf = 120 Ω)
Characteristics Symbol
Quiescent current I
Output power
Total harmonic distortion THD ― P
Voltage gain
Input resistance RIN ― ― 30 ― kΩ
Output noise voltage Vno ―
Ripple rejection ratio R.R. ― Rg = 600 Ω, f
Cross talk C.T. ―
Input offset voltage V13, V11 ― ― ― 30 60 mV
Stand-by current I
CCQ
P
out (1)
P
out (2)
G
G
OFF
v (1)
v (2)
Test
Circuit
― Vin = 0 ― 21 45 mA
― THD = 10% 2.0 2.5 ―
― THD = 10%, VCC = 12 V ― 4.6 ―
―
―
― SW1 → OFF ― 1 ― µA
R
V
R
V
R
BW = 20 Hz~20 kHz
R
f = 1 kHz,
V
Test Condition Min Typ. Max Unit
= 0.4 W/ch ― 0.2 1.0 %
out
= 120 Ω,
f
= 0.775 Vrms (0dBm)
out
= 0,
f
= 0.775 Vrms (0dBm)
out
= 10 kΩ,
g
= 100 kHz ― −52 ― dB
ripple
= 600 Ω, amp1 2,
g
= 0.775 Vrms (0dBm)
out
43 45 47
― 56.5 ―
― 0.3 1.0 mVrms
― −50 ― dB
W
dB
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Test Circuit
TA8229K
*1: This IC can be used without coupling capacitor (CIN). If volume slide noise occurred by input offset voltage
is undesirable, it needs to use the capacitor (C
*2: The condenser between the pin 8 and the GND (C11) is for reducing POP noise when the power ON/OFF
switch (SW1) is set to ON/OFF.
IN
).
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TA8229K
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TA8229K
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TA8229K
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TA8229K
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Package Dimensions
TA8229K
Weight: 3.9 g (typ.)
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TA8229K
A
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.
· 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.
000707EB
· The information contained herein is subject to change without notice.
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