TA8276H TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8276H Max Power 35 W BTL × 4 ch Audio Power IC The TA8276H is 4 ch BTL audio power amplifier for car audio application. This IC can generate more high power: POUTMAX = 35 W as it is included the pure complementary PNP and NPN transistor output stage. It is designed low distortion ratio for 4 ch BTL audio power amplifier, built-in stand-by function, muting function, output clipping detection and diagnosis circuit which can detect output to VCC/GND short and over voltage input mode. Additionally, the AUX amplifier and various kind of protector for car audio use are built-in. Weight: 7.7 g (typ.) Features · High power : POUTMAX (1) = 35 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω) : POUTMAX (2) = 31 W (typ.) (VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 Ω) : POUT (1) = 23 W (typ.) (VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω) : POUT (2) = 20 W (typ.) (VCC = 13.2 V, f = 1 kHz, THD = 10%, RL = 4 Ω) · Built-in output clipping detection and diagnosis circuit (pin 25) · Low distortion ratio: THD = 0.02% (typ.) (VCC = 13.2 V, f = 1 kHz, POUT = 5 W, RL = 4 Ω) · Low noise: VNO = 0.10 mVrms (typ.) (VCC = 13.2 V, Rg = 0 Ω, GV = 26 dB, BW = 20 Hz~20 kHz) 1. · Built-in stand-by switch (pin 4) · Built-in muting function (pin 22) · Built-in AUX amplifier from single input to 2 channels output (pin 16) · Built-in various protection circuit · Operating supply voltage: VCC (opr) = 9~18 V : Thermal shut down, over voltage, out to GND, out to VCC, out to out short, speaker burned 1 2002-02-13 TA8276H 20 VCC1 6 VCC2 OUT1 (+) C1 11 9 IN1 PW-GND1 8 OUT1 (-) 12 5 IN2 PW-GND2 2 OUT2 (-) C6 16 15 RL 19 21 IN4 PW-GND4 24 OUT4 (-) 10 23 4 25 22 C4 RIP RL CLIP OUT & DIAGNOSIS STBY OUT MUTE R1 13 C2 PRE-GND 17 PW-GND3 18 OUT4 (+) 14 3 IN3 OUT3 (-) C1 RL AUX IN OUT3 (+) C1 RL 7 OUT2 (+) C1 C3 1 TAB C5 Block Diagram : PRE-GND : PW-GND 2 2002-02-13 TA8276H 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. Amp. 2A Amp. 1 Input Amp. 2B Figure 1 Block Diagram The voltage gain of Amp.1: GV1 = 0 dB The voltage gain of Amp.2A, B: GV2 = 20 dB The voltage gain of BLT Connection: GV (BTL) = 6 dB Therefore, the total voltage gain is decided by expression below. GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26 dB 2. Stand-by SW Function (pin 4) By means of controlling pin 4 (stand-by terminal) to high and low, the power supply can be set to ON and OFF. The threshold voltage of pin 4 is set at about 3VBE (typ.), and the power supply current is about 2 mA (typ.) at the stand-by state. Power VSB (V) ON OFF 0~1.5 OFF ON 3~VCC ON Power OFF 4 10 kW » 2VBE to BIAS CUTTING CIRCUIT Control Voltage of pin 4: VSB Stand-by VCC Figure 2 With pin 4 set to High, Power is turned ON Adjustage of Stand-by SW (1) (2) Since VCC can directly be controlled to ON or OFF by the microcomputer, the switching relay can be omitted. Since the control current is microscopic, the switching relay of small current capacity is satisfactory for switching 3 2002-02-13 TA8276H RELAY Large current capacity switch BATTERY BATTERY VCC FROM MICROCOMPUTER VCC – Conventional Method – Small current capacity switch BATTERY DIRECTLY FROM MICROCOMPUTER BATTERY Stand-By VCC Stand-By VCC – Stand-by Switch Method – Figure 3 3. Muting Function (pin 22) By means of controlling pin 22 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 10 kW to get enough muting attenuation. The muting function have to be controlled by a transistor, FET and m-COM port which has IMUTE > 250 mA ability. Pin 22 terminal voltage has the temperature characteristics of 4.6 V (low temperature) to 3.2 V (high temperature). Therefore, it is need to design with attention as using the microcontroller of which operating voltage is less than 5 V. Terminal 22 may not be pulled up and shall be controlled by OPEN/LOW. When it is obliged to do, it must be pulled up via diode, because it has to defend flowing reverse current to internal circuit of pin 22. <Recommended Application> ATT – VMUTE 20 A 10 kW IMUTE VMUTE <Application for pulled up> I (100 mA) 22 -20 -40 -60 0 IMUTE PL = 4 W f = 1 kHz Muting Function BW = 400~30 kHz 0.4 0.8 1 1.2 1.6 2 Point A voltage: VMUTE VMUTE Figure 4 VCC = 13.2 V Po = 10 W -80 -100 R1 C4 IMUTE (OFF) 5 kW 0 (dB) R1 22 C4 IMUTE (OFF) Mute attenuation ATT I (100 mA) Figure 5 4 2.4 2.8 3 (V) Mute Attenuation - VMUTE (V) 2002-02-13 TA8276H 4. AUX Input (pin 16) 20 dB AMP. The pin 16 is for input terminal of AUX amplifier. The total gain is 0 dB by using of AUX amplifier. Therefore, the m-COM can directly drive the AUX amplifier. BEEP sound or voice synthesizer signal can be input to pin 16 directly. When AUX function is not used, this pin must be connected to PRE-GND (pin 13) via a capacitor. IN OUT (+) OUT (-) AUX AMP AUX-IN m-COM 16 -20 dB Figure 6 5. AUX Input Diagnosis Output (pin 25) This diagnosis output terminal of pin 25 has open collector output structure on chip as shown in Figure 7. In case diagnosis circuit that detect unusual case is operated, NPN Tr. (Q1) is turned on. It is possible to protect all the system of apparatus as well as power IC protection. In case of being unused this function, use this IC as open-connection on pin 25. 5V 25 V25 OUTPUT CLIP DETECTOR 5V Q1 OUTPUT SHORT PROTECTOR GND OVER VOLTAGE PROTECTOR t Q1 is turned on pin 25: Open collector output (active low) Figure 7 5.1 Self Diagnosis Output In Case of Shorting Output to VCC/GND or Over Voltage Power Supplied NPN Tr. (Q1) is turned on. Threshold of over voltage protection: VCC = 22 V (typ.) 5V 25 LED/LCD m-COM ALAME (Flashing) (Announcement from a speaker.) REGULATOR → OFF (Relay → OFF) MEMORY (Count and record) Figure 8 5.2 Application 1 In Case of Shorting Output to Output NPN Tr. (Q1) is turned on and off in response to the input signal voltage. 5 2002-02-13 TA8276H 5.3 Prevention of speaker burning accident (In Case of Rare Short Circuit of Speaker) When the direct current resistance between OUT + and OUT - terminal becomes 1 W or less and output current over 4 A flows, this IC makes a protection circuit operate and suppresses the current into a speaker. This system makes the burning accident of the speaker prevent as below mechanism. <The guess mechanism of a burning accident of the speaker> Abnormal output offset voltage (voltage between OUT + and OUT -) over 4 V is made by the external circuit failure.(Note 1) ¯ The speaker impedance becomes 1 W or less as it is in a rare short circuit condition. ¯ The current more than 4 A flows into the speaker and the speaker is burned. Current into a speaker Operating point of protector Less than 4 W About 1 W 4W Speaker impedance Figure 9 Note 1: It is appeared by biased input DC voltage (for example, large leakage of the input capacitor, short-circuit between copper patterns of PCB.) 5.4 Applications When output terminals short-circuit to VCC or GND, the voltage of 25pin is fixed to “L”. And when shorting OUT + to OUT -, “L” and “H” are switched according to an input signal. Therefore, it is possible to judge how the power IC condition is if a micro-controller detects the 25pin voltage that is smoothed out with LPF. It is recommend that the threshold voltage (Vth) is set up as higher as possible because output level of LPF is changed according to an input signal. (for example, Vth is set up to 4 V if 25pin is pulled up to 5 V line.) Output voltage of L.P.F. Operating point of protector 5V Output power Figure 10 6 2002-02-13 TA8276H 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 11. In case that the output waveform is clipping, the clip detection circuit is operated and NPN Tr. is turned on. 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 11. In case of being unused this function, use this IC as open connection on pin 25. (Application) 5V 25 OUTPUT CLIP DETECTOR VOLUME CONTROL CIRCUIT L.P.F. SMOOTHING CIRCUIT TONE CONTROL CIRCUIT pin 25: Open collector output (active low) Figure 11 (A) Output (AC wave form) AC (A) t (B) Clip Detector Circuit (internal) DC (B) t (B) Clip Detector Terminal (pin 25) DC (C) 5V GND t Figure 12 Clip Detection 7 2002-02-13 TA8276H Maximum Ratings (Ta = 25°C) Characteristics Symbol Rating Unit VCC (surge) 50 V DC supply voltage VCC (DC) 25 V Operation supply voltage VCC (opr) 18 V Peak supply voltage (0.2 s) Output current (peak) IO (peak) Power dissipation PD (Note 1) 9 A 125 W Operation temperature Topr -40~85 °C Storage temperature Tstg -55~150 °C Note 1: Package thermal resistance qj-T = 1°C/W (typ.) (Ta = 25°C, with infinite heat sink) Electrical Characteristics (unless otherwise specified, VCC = 13.2 V, f = 1 kHz, RL = 4 W, Ta = 25°C) Characteristics Symbol Test Circuit ICCQ ¾ POUT MAX (1) Min Typ. Max Unit VIN = 0 ¾ 200 400 mA ¾ VCC = 14.4 V, max Power ¾ 35 ¾ POUT MAX (2) ¾ VCC = 13.7 V, max Power ¾ 31 ¾ POUT (1) ¾ VCC = 14.4 V, THD = 10% ¾ 23 ¾ POUT (2) ¾ THD = 10% 17 20 ¾ THD ¾ POUT = 5 W ¾ 0.02 0.2 Voltage gain GV ¾ VOUT = 0.775 Vrms (0 dBm) 24 26 28 Voltage gain ratio DGV ¾ VOUT = 0.775 Vrms (0 dBm) -1.0 0 1.0 VNO (1) ¾ Rg = 0 W, DIN45405 ¾ 0.12 ¾ VNO (2) ¾ Rg = 0 W, BW = 20 Hz~20 kHz ¾ 0.10 0.35 Ripple rejection ratio R.R. ¾ frip = 100 Hz, Rg = 620 W Vrip = 0.775 Vrms (0 dBm) 40 50 ¾ dB Cross talk C.T. ¾ Rg = 620 W VOUT = 0.775 Vrms (0 dBm) ¾ 65 ¾ dB VOFFSET ¾ ¾ -150 0 150 mV Input resistance RIN ¾ ¾ ¾ 90 ¾ kW Stand-by current ISB ¾ Stand-by condition ¾ 2 10 mA VSB H ¾ Power: ON 3.0 ¾ VCC VSB L ¾ Power: OFF 0 ¾ 1.5 VM H ¾ Mute: OFF VM L ¾ Mute: ON, R1 = 10 kW 0 ¾ 0.5 V ATT M ¾ Mute: ON, VOUT = 7.75 Vrms (20 dBm) at Mute: OFF. 80 90 ¾ dB Quiescent current Output power Total harmonic distortion Output noise voltage Output offset voltage Stand-by control voltage Mute control voltage Mute attenuation (Note 2) Test Condition W % dB mVrms V ¾ Open Note 2: Muting function have to be controlled by open and low logic, which logic is a transistor, FET and m-COM port of IMUTE > 250 mA ability. This means than the mute control terminal : pin 22 must not be pulled-up. 8 2002-02-13 TA8276H 6 VCC2 OUT1 (+) 0.22 mF C1 11 PW-GND1 8 OUT2 (+) C1 12 C6 16 C1 15 14 3 17 PW-GND3 18 RL 19 21 IN4 PW-GND4 24 OUT4 (-) 10 23 4 25 22 C4 1 mF RIP RL CLIP OUT & DIAGNOSIS STBY OUT MUTE 10 kW R1 13 10 mF C2 PRE-GND RL IN3 OUT4 (+) C1 5 AUX IN OUT3 (-) 0.22 mF 7 PW-GND2 2 OUT3 (+) 0.22 mF RL IN2 OUT2 (-) 0.22 mF 9 IN1 OUT1 (-) 0.22 mF C3 0.1 mF 20 VCC1 3900 mF 1 TAB C5 Test Circuit : PRE-GND : PW-GND 9 2002-02-13 TA8276H T.H.D – POUT T.H.D – POUT 100 100 (%) f = 1 kHz RL = 4 W 10 10 T.H.D Total harmonic distortion Total harmonic distortion T.H.D (%) VCC = 13.2 V RL = 4 W 1 10 kHz 100 Hz 0.1 1 9.0 V 13.2 V 0.1 1 kHz 16.0 V 0.01 0.1 1 10 Output power POUT 0.01 0.1 100 1 (W) Output power ICCQ – VCC (W) 1 (%) RL = ¥ T.H.D VIN = 0 300 Total harmonic distortion ICCQ (mA) POUT 100 T.H.D – f 400 Quiescent current 10 200 100 0 0 10 20 Power supply voltage VCC 0.1 (V) OUT1 OUT2 0.01 OUT4 VCC = 13.2 V RL = 4 W Pout = 5 W 0.001 10 30 OUT3 100 1k Frequency f 10 10 k 100 k (Hz) 2002-02-13 TA8276H VNO – Rg R.R. – f 0 200 150 VCC = 13.2 V Ripple rejection ratio R.R. (dB) VNO VCC = 13.2 V RL = 4 W 250 BW = 20 Hz~20 kHz Output noise voltage (mVrms) 300 100 50 0 10 100 1k 10 k Signal source resistance Rg -10 RL = 4 W Rg = 620 W -20 Vrip = 0dBm -30 -40 -50 -60 -70 10 100 k 100 (9) Frequency f C.T. – f (OUT1) -10 VOUT = 0.775 Vrms (0 dBm) -30 -40 -50 C.T. (dB) Rg = 620 W RL = 4 W -20 Cross talk C.T. (dB) (Hz) VCC = 13.2 V VOUT = 0.775 Vrms (0 dBm) Rg = 620 W Cross talk 100 k 0 VCC = 13.2 V -20 10 k C.T. – f (OUT2) 0 -10 1k -40 RL = 4 W -30 -50 OUT1 ® OUT2, 3 -60 OUT2 ® OUT1 -60 OUT1 ® OUT4 -70 10 100 1k Frequency f 10 k OUT2 ® OUT3, 4 -70 10 100 k 100 (Hz) Frequency f C.T. – f (OUT3) -10 RL = 4 W -30 -40 OUT3 ® OUT4 -50 C.T. (dB) VOUT = 0dBm Rg = 620 W -20 Cross talk C.T. (dB) Cross talk (Hz) VCC = 13.2 V RL = 4 W VOUT = 0dBm -40 Rg = 620 W -30 -50 OUT3 ® OUT1 -60 -70 10 100 k 0 VCC = 13.2 V -20 10 k C.T. – f (OUT4) 0 -10 1k OUT4 ® OUT3 -60 OUT3 ® OUT2 100 1k Frequency f 10 k -70 10 100 k (Hz) OUT4 ® OUT1, 2 100 1k Frequency f 11 10 k 100 k (Hz) 2002-02-13 TA8276H GV – f PD – POUT 40 70 (W) 60 PD 30 25 Power dissipation Voltage gain GV (dB) 35 20 15 10 VCC = 13.2 V RL = 4 W 5 16 V 50 40 13.2 V 30 20 9V 10 f = 1 kHz RL = 4 W VOUT = 0.775 Vrms (0 dBm) 0 10 0 100 1k Frequency f 10 k 100 k (Hz) 0 5 10 Output power 15 20 25 POUT/ch (C) PD MAX – Ta 120 Allowable power dissipation PD MAX. (w) ① INFINITE HEAT SINK RqJC = 1°C/W ② HEAT SINK (RqHS = 3.5°C/W) 100 RqJC + RqHS = 4.5°C/W ③ NO HEAT SINK 80 RqJA = 39°C/W ① 60 40 20 ② ③ 0 0 25 50 75 100 125 150 Ambient temperature Ta (°C) 12 2002-02-13 TA8276H Package Dimensions Weight: 7.7 g (typ.) 13 2002-02-13 TA8276H 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 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. 14 2002-02-13