TA8207K
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

1Weight: 3.2g (typ.)2002-10-30

TA8207K
Maximum Ratings (Ta = 25°C)
Characteristic

SymbolRating

Unit

VCC

20V

IO (peak)

2.5

APower dissipation

PD12.5W

Operating temperatureTopr-20~75°C

Storage temperature

Tstg-55~150°C

Supply voltage
Output current (peak / CH)

Electrical Characteristics(unless otherwise specified, VCC = 9V, RL = 4Ω, Rg = 600Ω, f = 1kHz, Ta = 25°C, Rf = 120Ω)
CharacteristicSymbol

Test
Circuit

ICCQ—

POUT (1)

Min.

Typ.

Max.

Unit

VIN = 0—2145mA—

THD = 10%

2.0

2.5

—

POUT (2)—

THD = 10%, VCC = 12V

—

4.6—

THD

—

POUT = 0.4W / ch—

0.2

1.0

GV (1)—

Rf = 120Ω,
VOUT = 0.775Vrms (0 dBm)

434547GV (2)—Rf = 0,VOUT = 0.775Vrms (0 dBm)

—

56.5

—

Input resistance

RIN—

—

30—kΩ

Output noise voltage

VNO—

Rg = 10kΩ,
BW = 20Hz~20kHz—

0.3

1.0mVrms

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——3060mV

Stand-by current

IOFF—

—

1—

µA

Quiescent current
Output power
Total harmonic
distortion

Voltage gain

Test Condition

W%dB——SW 1→off

Typical DC Voltage Of Each Terminal (VCC = 9V, Ta = 25°C)
Terminal no.

1

23456789101112DC voltage

8.7

4.5

VCC

5.0

0.7

0.03

0.03

0.7

GND

4.5

8.7

VCC

2

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TA8207K
Block Diagram / Test Circuit(*1): This IC can be used without coupling capacitor (CIN). If volume slide noise occured by input offset voltage isundesirable, 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(SW 1) is set to on / off.

3

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TA8207K
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.
G V = 20log

R f + R1 + R2
R f + R1

When Rf = 0ΩWhen Rf = 120Ω

GV = 56.5dB (typ.)
GV = 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 theabnormal 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 shownin 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 touse 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 TOSHIBAis recommended to be referrend to design it.

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TA8207K
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 supplyvoltage.
6. Input voltage
When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point isVIN = 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 talkworse. Before use this IC, please check it.

Standard Print Pattern5

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6

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7

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8

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Package Dimensions

Weight: 3.2g (typ.)9

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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 physicalstress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards ofsafety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure ofsuch 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 andconditions 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 orbodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane orspaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in thisdocument 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 ormalfunction of the destination device to which the circuit supplies output may cause damage to the circuit or to theproduct.
· 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 otherrights 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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