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TA8238K
7.3x2CH AUDIO POWER IC
TOSHIBA TA8238K
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC
TA8238K
7.3Wx2CH AUDIO POWER IC
The TA8238K is dual audio power amplifier for consumer
application.
It contains various kind of protectors and the function of
stand-by switch.
FEATURES
lt Output Power
POUT (1) =7.3W (Typ.)
(VCC= 13.2v, f=1kHz, THD= 10%, RL=2m
POUT (2) =6.4W (Typ.) . HSIP15-P-2.00A
POUT (3) = 5.3W (Typ.)
(Vcc=13.2V, f=1kHz, THD=10%, RL=4Q)
c Total Harmonic Distortion
THD=0.1% (Typ.)
(Vcc=13.2V, f=1kHZ, Pout= 1W, RL--4n)
o Built In Stand-By Switch Function
I STBY=1yA (Typ.)
(With Pin© set at High, power is turned ON.)
a Built In Junction Temperature Detection Function
(PinCD : 10mV/°C)
o Built In Various Protection Circuits
Over Voltage, Thermal Shut Down
Out to GND, Out to Vcc
0 Operating Supply Voltage
1 2001-06-25
TOSHIBA
BLOCK DIAGRAM
(GV = 52dB)
Smoothing
csif8" STBY sw
IN1CJ '+ 3 +
CNFI t,
TA8238K
L" Vcc
/t Cvcc
B.SI m BS1
‘1 COUT1
g-O. Pre-GND PW-GND Clio"
CIN2 BSit CE
IN2 o ' + 5 +
s - OUT2 m
c T, + NF2
Bias Tj
RIP. Ti DET.
Crip l,'
CAUTION AND APPLICATION METHOD INPUT
(Description is made only on the single channel.)
1. Voltage Gain Adjustment
The closed loop voltage gain (GV) is determined by
R1, R2 and Rf.
GV = 208og M(dB)
Rf + R1
When Rf=0, GV=52dB (Typ.) is given. E.
The voltage gain is reduced when Rf is increased. :
(Fig.2) g
With the voltage gain reduced, since the oscillation Fl
stability is reduced, refer to the items 3. 2'
J) Cosc1 g
+ ". -
OUTPUT
200 300 400 500 600
FEEDBACK RESISTANCE RF (0)
(Fig.2)
TOSHIBA TA8238K
2. Stand-by SW Function
By means of controlling pin© (Stand-by terminal) to High
and Low, the power supply can be set to ON and OFF.
The threshold voltage of pin© is set at 2.1V (3VBE), and
To bias Cutting
Circuit
the Power Supply current is about 1/1A (Typ.) at the k-ON
stand-by state. lOFj:
Control Voltage pin© : V(SB)
Stand-By Power V(SB) (V)
ON OFF 0--2 (Fig.3)With Pins Set to High,
Power is Turned ON.
OFF ON 3~Vcc
Advantage of Stand-by SW
(1) Since VCC can directly be controlled to ON, 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.
Large current capacity switch r-W-a-Y-,
Battery
Battery l l
" -- J
Vcc Vcc
microcomputer
- Conventional Method -
Directly from
Small current capacity switch microcomputer
Battery
Battery
Stand-By VCC Stand-By VCC
- Stand by Switch Method -
3 2001-06-25
TOSHIBA TA8238K
3. Preventive Measure Against Oscillation
COSC : For preventing the oscillation, it is advisable to use COSC, the condenser of polyester film
having small characteristic fluctuation of the temperature and the frequency.
The resistance R to be series applied to COSC is effective for phase correction of high
frequency, and improves the oscillation allowance.
(1)Vo|tage gain to be used (GV Setting)
(2) Capacity value of condenser
(3) Kind of condenser
(4) Layout of printed board
In case of its use with the voltage gain GV reduced or with the feedback amount
increased, care must be taken because the phase-inversion is caused by the high frequency
resulting in making the oscillation liable generated.
4. Junction Temperature Detecting pin0D
Using temperature characteristic of a band gap circuit and in proportion to junction temperature,
pin0) DC voltage: V2 rises at about +10mV/°C temperature characteristic. So, the relation between
V2 at Tj =25°C and V2x at Tj =x°C is decided by the following expression :
1/2x - V2 (25°C)
T °c =
(x ) 10mV/°C
+25 (°C) V1
+10mV/°C
V1X ------------
V (25°C)
In deciding a heat sink size, a junction temperature can be 1
easily made clear by measuring voltage at this pin while a
backside temperature of IC was so far measured using a
thermocouple type thermometer. (Fig.4)
4 2001-06-25
TOSHIBA TA8238K
5. Pop Noise
The pop noise is reduced by the time constant I of pin. : smoothing.
Therefore, we recommend CS=100PF, which is between pin@ and GND, because the pop noise will
become worse by using the smaller capacity of cs.
=1 F: LE THAN RE
Cs=100pf: RECOMMENDED VALUE CS Op SS VALUE COMMENDED
Small Pop Noise Large Pop Noise
Ouput DC Voltage Vout(DC) Output DC Voltage Vout(DC)
Output AC Voltage Vout(AC) Output AC Voltage Vout(AC)
OUTPUT DC VOLTAGE 2V/DIV, 20ms/DIV OUTPUT DC VOLTAGE 2V/DIV, 20ms/DIV
OUTPUT AC VOLTAGE 1V/DIV, 20ms/DIV OUTPUT AC VOLTAGE 1V/DIV, 20ms/DIV
MAXIMUM RATINGS (Ta = 25°C)
CHARACTERISTIC SYMBOL RATING UNIT
Peak Supply Voltage (0.25) Vcc(surge) 50 V
DC Supply Voltage VCC(DC) 20 V
Operating Supply Voltage chopr) 18 V
Output Current (peak) Io(peak) 4.5 A
Power Dissipation PD 15 W
Operating Temperature Topr -30--85 °C
Storage Temperature Tstg - 55--150 ''C
5 2001-06-25
TOSHIBA TA8238K
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Vcc=13.2V, f=1kHz, Rg =6000, RL=4Q, Ta =25°C)
CHARACTERISTIC SYMBOL CIR- TEST CONDITION MIN. TYP. MAX. UNIT
Quiescent Current Iccq - Vin = 0 - 60 150 mA
Pout(1) - THD-- 10%, RL=2Q - 7.3 - w
Output Power Pout (2) - VCC = 14.4V, THD = 10% - 6.4 - W
Pout (3) - THD =10% 4.8 5.3 - w
Total Harmonic
- = - t)
Distortion THD Pout 1W 0.1 0.5 ',4
Voltage Gain GV - Vout=ih775Vrms(0dBm) 50 52 54 dB
Voltage Gain Ratio AGV - Vout=0.775Vrms(OdBm) -1 0 1 dB
Output Noise Voltage VNO - Rg = on, BW= 20Hz~20kH2 - 0.2 0.7 mvrms
fripple =100HZ,
Ripple Rejection Ratio R.R. - Vout=0.775Vrms(OdBm), 40 57 - dB
Rg = 6000,
Cross Talk C.T. - Vout=0-775Vrms (OdBm) - 65 - dB
Input Resistance RIN - - - 30 - k0
Stand-By Current ISTBY - Pin© : GND - 1 10 pA
TEST CIRCUIT
(GV = 52dB)
CD VCC
STBY SW
6 2001-06-25
TOSHIBA
TOTAL HARMONIC DISTORTION THD (%)
TOTAL HARMONIC DISTORTION THD (%)
TOTAL HARMONIC DISTORTION THD
THD - POUT
0.1 0.3 0.5 1 3 5 10
OUTPUT POWER POUT (W)/ch
THD - POUT
0.1 0.3 0.5 1 3 5 10
OUTPUT POWER POUT (W)/ch
Vcc=13.2V
1 VOUT=1W/ch
10 30 50 100 3005001k 3k 5k 10k 30k 50k100k
FREQUENCY f (Hz)
TOTAL HARMONIC DISTORTION THD (%)
TOTAL HARMONIC DISTORTION THD (%)
RIPPLE REJECTION RATIO R.R.
TA8238K
THD - POUT
0.5 f=10kHZ
0.1 00 Z
005 1kHz
0.1 0.3 0.5 1 3 5 10
OUTPUT POWER POUT (W)/ch
THD - POUT
VCC =13.2V
10 Dual
0.5 f=10kHZ
005 1kHz
0.1 0.3 0.5 1 3 5 10
OUTPUT POWER POUT (W)/ch
R.R. - R
Vcc=13.2V
-10 RL=4Q
1/rip--th775Vrms(0dBm)
frip=100Hz
- 20 GV = 52dB
10 100 1k 10k 100k
SIGNAL SOURCE RESISTANCE R9 (fl)
TOSHIBA
VOLTAGE GAIN GV (dB) RIPPLE REJECTION RATIO R.R.
ALLOWABLE POWER DISSIPATION PD (W)
10 30 50100 3005001k
R.R. - frip
Vcc=13.ZV
RL=452
Vrip=0-77Wrms(0dBm)
Rg =600Q
Gv= 52dB
30 50 100 1k 10k
FREQUENCY frip (Hz)
Vcc=Ir2V
VOUT = 0-775Vrms (OdBm)
3k 5k 10k 30k 50k100k
FREQUENCY f (Hz)
PD - Pout
THD=1%
123 4567 8910
OUTPUT POWER Pout (W)
OUTPUT NOISE VOLTAGE VNO (mVrms)
CROSS TALK C.T.
ALLOWABLE POWER DISSIPATION PD
TA8238K
Vcc=13.2V
GV-- 52dB
DIN AUDIO
30 50 100 3005001k 3k 5k 10k 30k50k100k
SIGNAL SOURCE RESISTANCE R9 (Q)
CT. - f
Vcc=13.2V
-10 RL=40
VouT--0.775Vrms(0dBm)
10 30 50100 300 5001k 3k 5k 10k 30k 50k 100k
FREQUENCY f (Hz)
Infinite Heat Sink 15.0W
5.0°C/W
No Heat Sink 2.27W I
55°C/W
0 25 50 75 100 125 150
AMBIENT TEMPERATURE Ta CC)
TOSHIBA TA8238K
PACKAGE DIMENSIONS
HSIP15-P-2.00A Unit : mm
1 .OTYP
Weight : 3.99 (Typ.)
15.0i0.2
63.7m2
l (f? tci':.' a
, It I
i ill i .t m
l Lj 0.6i0.1 $0.4 0.8M.1
30.5MAX
30.0i0.2
3.01'03
l l osotitls
TOSHIBA TA8238K
RESTRICTIONS ON PRODUCT USE
000707EBA
OTOSHIBA 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..
OThe 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.
0 The products described in this document are subject to the foreign exchange and foreign trade
OThe 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.
0 The information contained herein is subject to change without notice.
10 2001-06-25
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www.loq.com
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