TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
Max Power 37 W BTL � 4CH Audio Power IC
The TA8259H is 4 ch BTL audio power amplifier for car audio Weight: 9.8 g (typ.)
This IC can generate more high power: POUT MAX = 37 W as it is
included the pure complementary PNP and NPN transistor
It is designed low distortion ratio for 4 ch BTL audio power
amplifier, built-in Stand-by Function, Muting Function, Clip
detector, and diagnosis circuit.
Additionally, the AUX. amplifier is built-in, it can make the beep
signal etc. output to 2 channels (OUT1 and 4).
It contains various kind of protectors for car audio use.
� High power
: POUT MAX (1) = 37 W (typ.)
(VCC = 14.4 V, JEITA max, RL = 4 )
: POUT MAX (2) = 35 W (typ.)
(VCC = 13.7 V, JEITA max, RL = 4 )
: POUT (1) = 24 W (typ.)
(VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 )
: POUT (2) = 21 W (typ.)
(VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 )
� Built-in clip detector & diagnosis circuit. (pin 25)
� Low distortion ratio
: THD = 0.02% (typ.)
(VCC = 13.2 V, f = 1 kHz, POUT = 5 W, RL = 4 )
� Low noise
: VNO = 0.16 mVrms (typ.)
(VCC = 13.2 V, Rg = 0 , GV = 34dB, BW = 20 Hz~20 kHz)
� Built-in stand-by switch function (pin 2)
� Built-in muting function (pin 24)
� Built-in AUX. amplifier from single input (pin 16) to 2 channels output ; OUT1 and 4
� Built-in various protection circuit
: Thermal shut down, over voltage, out to GND, out to VCC, out to out short
� Operating supply voltage: VCC (opr) = 9~18 V
Caution and Application Method (description is made only on the single channel)
1. Voltage gain adjustment
This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can't adjusted, but it makes
the device a space and total costs saver.
Figure 1 Block diagram
The voltage gain of Amp. 1 : GV1 = 8dB
The voltage gain of Amp. 2A, B : GV2 = 20dB
The voltage gain of BLT Connection : GV (BTL) = 6dB
Therefore, the total voltage gain is decided by expression below.
GV = GV1 + GV2 + GV (BTL) = 8 + 20 + 6 = 34dB
2. Stand-by SW function (pin 2)
By means of controlling pin 2 (Stand-by terminal) to
High and Low, the power supply can be set to ON and
The threshold voltage of pin 2 is set at about 3 VBE
(typ.), and the Power Supply current is about 2 �A
(typ.) at the stand-by state.
Control voltage of pin 2: V (SB)
Stand-By Power V (SB) (V)
ON OFF 0~1.5
OFF ON 3~ VCC Figure 2 With pin 2 set to high, power
Adjustage of stand-by SW is turned ON
(1) Since VCC can directly be controlled to ON or OFF by the microcomputer, the switching relay can be
(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory
Stand-by switch method
3. Muting function (pin 24)
By means of controlling pin 24 less than 0.5 V, it can make the audio muting condition.
The muting time constant is decided by R1 and C4 and these parts is related the pop noise at power
ON/OFF.The series resistance; R1 must be set up less than 15 k, we recommend 10 k.
The muting function have to be controlled by a transistor, FET and �-COM port which has IMUTE 250 �A
Terminal 24 must not be pulled up and it shall be controlled by OPEN/LOW.
Figure 4 Muting function Figure 5 Mute attenuation-Vmute (V)
4. AUX. input (pin 16)
The pin 16 is for input terminal of AUX. amplifier.
The total gain is 0dB by using of AUX. amplifier.
Therefore, the �-COM can directly drive the AUX. amplifier.
BEEP sound or voice synthesizer signal can be input to pin 16 directly.
Figure 6 AUX input
5. Diagnosis output (pin 25)
The diagnosis output terminal of pin 25 has open collector output structure on chip as shown in Figure 7.
In unusual case that output terminal of Power Amp. is condition of output to VCC or output to GND short
and over voltage input mode, it is possible to protect all the system of apparatus as well as power IC
In case of being unused this function, use this IC as open-connection on pin 25.
pin 25: Open collector output (active low)
6. Output clip detection function (pin 25)
The output clip detection terminal of pin 25 has the open collector output structure on chip as shown in
Figure 8. In case that the output waveform is clipping, the clip detection circuit is operated and NPN Tr. is
It is possible to improve the audio quality with controlling the volume, tone control circuit through L.P.F.
smoothing circuit as shown in Figure 8.
In case of being unused this function, use this IC as open connection on pin 25.
pin 25: Open collector output (active low)
(A) Output (AC wave form)
(B) Clip detector circuit (internal)
(C) Clip DET. terminal (pin 25)
7. Cross talk
The cross talk characteristics of the IC is not good between OUT1 and 2, OUT3 and 4.
So we recommend to use by below method.
OUT1, 2 L-ch (or R-ch)
OUT3, 4 R-ch (or L-ch)
And, please refer to below table in case of applying the AUX. IN because it is out to OUT1 and 4.
ex) in case of the Signal from AUX. IN to front speakers.
OUT1 Front L-ch (or R-ch) AUX. OUT
OUT3 Rear R-ch (or L-ch)
OUT4 Front AUX. OUT
Maximum Ratings (Ta = 25�C)
Characteristics Symbol Rating Unit
Peak supply voltage (0.2 s) VCC (surge) 50 V
DC supply voltage
Operating supply voltage VCC (DC) 25 V
Output current (peak)
Power dissipation VCC (opr) 18 V
Storage temperature IO (peak) 9 A
PD (Note 1) 250 W
Topr -40~85 �C
Tstg -55~150 �C
Note 1: Package thermal resistance j-T = 0.5�C/W (typ.)
(Ta = 25�C, with infinite heat sink)
(unless otherwise specified, VCC = 13.2 V, f = 1 kHz, RL = 4 , Ta = 25�C)
Characteristics Symbol Test Test Condition Min Typ. Max Unit
Quiescent current Circuit
ICCQ 200 400 mA
Output power POUT VIN = 0
Total harmonic distortion POUT VCC = 14.4 V, MAX power 37
Voltage gain MAX (2)
Voltage gain ratio POUT (1) VCC = 13.7 V, MAX power 35 W
Output noise voltage POUT (2)
Ripple rejection ratio THD VCC = 14.4 V, THD = 10% 24
Output offset voltage GV THD = 10% 19 21
Input resistance GV
Stand-by current VNO (1) POUT = 5 W 0.02 0.2 %
Stand-by control voltage VNO (2) VOUT = 0.775 Vrms (0dBm)
32 34 36 dB
Mute control voltage (Note 2) R.R.
Mute attenuation VOUT = 0.775 Vrms (0dBm) -1.0 0 1.0 dB
Rg = 0 , DIN45405 0.18
VOFFSET Rg = 0 , BW = 20 Hz~20 kHz mVrms
ISB 0.16 0.35
VSB H frip = 100 Hz, Rg = 620 40 50 dB
VSB L Vrip = 0.775 Vrms (0dBm)
VM L Rg = 620 , 62 dB
VOUT = 0.775 Vrms (0dBm)
-100 0 100 mV
Stand-by condition 2 10 �A
Power: on 3.0 VCC V
Mute: off OPEN
Mute: on, R1 = 10 k 0 0.5 V
Mute: on, VOUT = 7.75 Vrms (20dBm) 80 90 dB
at Mute: off.
Note 2: Muting function have to be controlled by open and Low Logic, which Logic is a transistor, FET and �-COM
port of IMUTE > 250 �A ability.
This means that the Mute control terminal: pin 24 must not be pulled-up.
Weight: 9.8 g (typ.)
RESTRICTIONS ON PRODUCT USE 000707EBF
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