TA8207K
2002-10-30
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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8207K
Low Frequency Power Amplifier
TA8207K is an audio power IC with built−in two channels
developed for portable radio cassette tape recorder with power on
/ off switch.
Because of the parts reduction and SIP (single inline package),
space merit is remarkable.
Thermal shut down protection circuit is built in.
Features
· High power: POUT = 2.5W (typ.)
(VCC = 9V, RL = 4Ω, f = 1kHz, THD = 10%)
POUT = 4.6W (typ.)
(VCC = 12V, RL = 4Ω, f = 1kHz, THD = 10%)
· Low popping noise at power on
· Small quiescent current: ICCQ = 21mA (typ.) (VCC = 9V, VIN = 0)
· Soft clip
· Built−in thermal shut down protection circuit
· Best for supply voltage 9V, 12V
· Operation supply voltage range: VCC = 6~15V
Weight: 3.2g (typ.)
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2002-10-30
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Maximum Ratings (Ta = 25°C)
Characteristic Symbol Rating Unit
Supply voltage VCC 20 V
Output current (peak / CH) IO (peak) 2.5 A
Power dissipation PD 12.5 W
Operating temperature Topr -20~75 °C
Storage temperature Tstg -55~150 °C
Electrical Characteristics
(unless otherwise specified, VCC = 9V, RL = 4Ω, Rg = 600Ω, f = 1kHz, Ta = 25°C, Rf = 120Ω)
Characteristic Symbol
Test
Cir-
cuit
Test Condition Min. Typ. Max. Unit
Quiescent current ICCQ — VIN = 0 — 21 45 mA
POUT (1) — THD = 10% 2.0 2.5 —
Output power
POUT (2) — THD = 10%, VCC = 12V — 4.6 —
W
Total harmonic
distortion THD — POUT = 0.4W / ch — 0.2 1.0 %
GV (1) —
Rf = 120Ω,
VOUT = 0.775Vrms (0 dBm) 43 45 47
Voltage gain
GV (2) —
Rf = 0,
VOUT = 0.775Vrms (0 dBm) — 56.5 —
dB
Input resistance RIN — — — 30 — kΩ
Output noise voltage VNO —
Rg = 10kΩ,
BW = 20Hz~20kHz — 0.3 1.0 mVrms
Ripple rejection ratio R.R. — Rg = 600Ω, fripple = 100Hz — 52 — dB
Cross talk C.T. —
Rg = 600Ω, アンプ 1↔2,
Vo = 0.775Vrms (0 dBm),
f = 1kHz
— 50 — dB
Input offset voltage V6, V7 — — — 30 60 mV
Stand-by current IOFF — SW1→off — 1 — µA
Typical DC Voltage Of Each Terminal (VCC = 9V, Ta = 25°C)
Terminal no. 1 2 3 4 5 6 7 8 9 10 11 12
DC voltage 8.7 4.5 VCC 5.0 0.7 0.03 0.03 0.7 GND 4.5 8.7 VCC
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2002-10-30
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Block Diagram / Test Circuit
(*1): This IC can be used without coupling capacitor (CIN). If volume slide noise occured by input offset voltage is
undesirable, it needs to use the capacitor (CIN).
(*2): The condenser between the (3) pin and the GND (C11) is for reducing pop noise when the power on / off switch
(SW1) is set to on / off.
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2002-10-30
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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 Fig. 1.
1
R
f
R
2
R
1
R
f
R
og20
V
G+
++
=l
When Rf = 0Ω G
V = 56.5dB (typ.)
When Rf = 120Ω G
V = 45dB (typ.)
By increasing Rf, reduction of GV is possible. However, since the feedback increase is liable to produce
oscillation, it is recommended to use this at 40dB or over.
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 Fig.2.
PNP Tr: Q1 is provided in the input
circuit so as to make its usage possible
without the input coupling capacitor.
However, at pin(6) and (7), max 60mV
offset voltage is produced.
Application after checking volume slide
noise is recommended.
For cutting the volume slide noise,
insert the input capacitor: CIN in series
to interrupt the DC component.
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 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 remarkable influence on the oscillation, connect
C10 to VCC at the nearest possible position from power GND.
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.
(*): As the oscillation allowance varies according to the printed pattern layout, the standard printed board of TOSHIBA
is recommended to be referrend to design it.
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2002-10-30
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5. Power on / off switch
There is power on / off switch at (3) pin. However, output power is changed by (3) pin supply voltage when (3)
pin supply voltage is not same (12) pin supply voltage, after referring to attached date, select (3) pin supply
voltage.
6. Input voltage
When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is
VIN = 300mVrms (typ.): VCC = 9V, RL = 4Ω, f = 1kHz: Enough care must be taken for this phenomenon.
7. GND line
GND pin is not separated for pre-GND and for PW-GND. That is liable to cause distortion and cross talk
worse. Before use this IC, please check it.
Standard Print Pattern
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Package Dimensions
Weight: 3.2g (typ.)
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2002-10-30
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· 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.
000707EBF
RESTRICTIONS ON PRODUCT USE
