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| TA8271H TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8271H Max Power 41 W BTL x 4 ch Audio Power IC The TA8271H is 4 ch BTL audio power amplifier for car audio application. This IC can generate more high power: POUTMAX = 41 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 and muting function. Additionally, the AUX amplifier and various kind of protector for car audio use is built-in. Features * High power: POUTMAX (1) = 41 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 ) : POUTMAX (2) = 37 W (typ.) (VCC = 13.7 V, f = 1 kHz, 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 ) * * * * * * * Low distortion ratio: THD = 0.02% (typ.) (VCC = 13.2 V, f = 1 kHz, POUT = 5 W, RL = 4 ) Low noise: VNO = 0.18 mVrms (typ.) (VCC = 13.2 V, Rg = 0 , GV = 34dB, BW = 20 Hz~20 kHz) Built-in stand-by switch function (pin 4) Built-in muting function (pin 22) Weight: 7.7 g (typ.) Built-in AUX amplifier from single input to 2 channels output (pin 16) 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 1 2002-02-13 TA8271H Block Diagram C5 1 TAB 20 VCC1 6 VCC2 OUT1 (+) 9 C1 11 IN1 PW-GND1 8 OUT1 (-) 7 RL OUT2 (+) 12 IN2 5 RL C1 PW-GND2 2 OUT2 (-) 3 C6 16 AUX IN OUT3 (+) 15 IN3 17 RL C1 PW-GND3 18 OUT3 (-) 19 OUT4 (+) 14 IN4 21 RL C1 PW-GND4 24 OUT4 (-) 23 PRE-GND 13 RIP 10 C2 STBY 4 R2 C7 MUTE2 25 C8 MUTE 22 R1 C4 : PRE-GND : PW-GND C3 2 2002-02-13 TA8271H 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 = 8 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) = 8 + 20 + 6 = 34 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. VCC ON Power OFF 4 10 kW 2VBE to BIAS CUTTING CIRCUIT Control Voltage of pin 4: VSB Stand-by ON OFF Power OFF ON VSB (V) 0~1.5 3~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 TA8271H Large current capacity switch BATTERY RELAY BATTERY VCC VCC - Conventional Method - FROM MICROCOMPUTER 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, C4 and C8 and these parts is related the pop noise at power ON/OFF. The series resistance; R1 must be set up less than 5 kW. The muting function have to be controlled by a transistor, FET and m-COM port which has IMUTE > 50 mA ability. ATT - VMUTE 0 -10 25 C8 Mute attenuation ATT I (20 mA) IMUTE (OFF) (dB) -20 -30 -40 -50 -60 -70 -80 -90 -100 1.2 1.4 1.6 R1 = 5 kW R1 = 2.2 kW 22 C4 R1 IMUTE A VMUTE VCC = 13.2 V Po = 10 W RL = 4 W f = 1 kHz 1.8 2.0 2.2 2.4 2.6 2.8 Point A voltage: VMUTE (V) Figure 4 Muting Function Figure 5 Mute Attenuation - VMUTE (V) 4 2002-02-13 TA8271H 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 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. 20dB AMP. IN OUT (+) OUT (-) AUX AMP m-COM AUX-IN 16 -20dB Figure 6 AUX Input 5. 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. 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 2002-02-13 TA8271H Maximum Ratings (Ta = 25C) Characteristics Peak supply voltage (0.2 s) DC supply voltage Operation supply voltage Output current (peak) Power dissipation Operation temperature Storage temperature Symbol VCC (surge) VCC (DC) VCC (opr) IO (peak) PD (Note1) Topr Tstg Rating 50 25 18 9 125 -40~85 -55~150 Unit V V V A W C C Note1: Package thermal resistance qj-T = 1C/W (typ.) (Ta = 25C, with infinite heat sink) Electrical Characteristics Characteristics Quiescent current (unless otherwise specified VCC = 13.2 V, f = 1 kHz, RL = 4 W, Ta = 25C) Symbol ICCQ POUT MAX (1) Output power POUT MAX (2) POUT (1) POUT (2) Total harmonic distortion Voltage gain Voltage gain ratio Output noise voltage THD GV DGV VNO (1) VNO (2) Ripple rejection ratio Cross talk Output offset voltage Input resistance Stand-by current Stand-by control voltage R.R. C.T. VOFFSET RIN ISB VSB H VSB L Mute control voltage (Note2) VM H VM L Mute attenuation ATT M Test Circuit 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 VIN = 0 VCC = 14.4 V, max Power VCC = 13.7 V, max Power VCC = 14.4 V, THD = 10% THD = 10% POUT = 5 W VOUT = 0.775 Vrms (0dBm) VOUT = 0.775 Vrms (0dBm) Rg = 0 W, DIN45405 Rg = 0 W, BW = 20 Hz~20 kHz frip = 100 Hz, Rg = 620 W Vrip = 0.775 Vrms (0dBm) Rg = 620 W VOUT = 0.775 Vrms (0dBm) 3/4 3/4 Stand-by condition Power: ON Power: OFF Mute: OFF Mute: ON, R1 = 10 kW Mute: ON, VOUT = 7.75 Vrms (20dBm) at Mute: OFF. 0 80 Test Condition Min 3/4 3/4 3/4 3/4 19 3/4 32 -1.0 3/4 3/4 40 3/4 -150 3/4 3/4 3.0 0 Typ. 200 41 37 24 21 0.02 34 0 0.20 0.18 50 60 0 30 2 3/4 3/4 Open 3/4 90 0.5 3/4 Max 400 3/4 3/4 3/4 3/4 0.2 36 dB 1.0 3/4 0.42 3/4 3/4 +150 3/4 10 VCC 1.5 3/4 V dB dB dB mV kW mA V mVrms % W Unit mA Note2: Muting function have to be controlled by open and low logic, which logic is a transistor, FET and m-COM port of IMUTE > 50 mA ability. 6 2002-02-13 TA8271H Test Circuit 1 TAB 20 VCC1 6 VCC2 OUT1 (+) 9 0.22 mF C1 11 IN1 PW-GND1 8 OUT1 (-) 7 RL OUT2 (+) 0.22 mF C1 12 IN2 5 RL PW-GND2 2 OUT2 (-) 3 0.22 mF C6 16 AUX IN OUT3 (+) 0.22 mF C1 15 IN3 17 RL PW-GND3 18 OUT3 (-) 19 OUT4 (+) 0.22 mF C1 14 IN4 21 RL PW-GND4 24 OUT4 (-) 23 PRE-GND 13 RIP 10 C2 10 mF STBY 4 R2 10 kW MUTE2 C7 0.047 mF 25 C8 0.1 mF MUTE 22 C4 33 mF R1 5 kW 3900 mF : PRE-GND : PW-GND C3 0.1 mF C5 7 2002-02-13 TA8271H T.H.D - POUT 100 VCC = 13.2 V RL = 4 W 100 f = 1 kHz RL = 4 W T.H.D - POUT (%) 10 (%) Total harmonic distortion T.H.D 10 Total harmonic distortion T.H.D 1 10 kHz 1 13.2 V 9.0 V 0.1 100 Hz 0.1 1 kHz 16.0 V 0.01 0.1 1 10 100 0.01 0.1 1 10 100 Output power POUT (W) Output power POUT (W) ICCQ - VCC 400 1 T.H.D - f (%) T.H.D 0.1 OUT3 RL = (mA) VIN = 0 300 ICCQ 200 Total harmonic distortion Quiescent current OUT1, 2, 4 0.01 VCC = 13.2 V RL = 4 W Pout = 5 W 0.001 10 100 1k 10 k 100 k 100 0 0 10 20 30 Power supply voltage VCC (V) Frequency f (Hz) 8 2002-02-13 TA8271H VNO - Rg 300 0 VCC = 13.2 V -10 -20 -30 -40 -50 -60 -70 10 RL = 4 W Rg = 620 W Vrip = 0dBm R.R. - f (mVrms) 200 Output noise voltage 150 100 50 0 10 100 1k 10 k Ripple rejection ratio R.R. (dB) VCC = 13.2 V RL = 4 W 250 BW = 20 Hz~20 kHz VNO 100 k 100 1k 10 k 100 k Signal source resistance Rg (9) Frequency f (Hz) C.T. - f (OUT1) 0 VCC = 13.2 V -10 RL = 4 W VOUT = 0dBm -10 0 VCC = 13.2 V RL = 4 W VOUT = 0dBm Rg = 620 W C.T. - f (OUT2) C.T. (dB) -20 -30 -40 -50 C.T. (dB) Cross talk OUT1 (R) OUT2, 3, 4 Rg = 620 W -20 -30 -40 -50 Cross talk OUT2 (R) OUT1, 3, 4 -60 -70 10 -60 -70 10 100 1k 10 k 100 k 100 1k 10 k 100 k Frequency f (Hz) Frequency f (Hz) C.T. - f (OUT3) 0 VCC = 13.2 V -10 RL = 4 W VOUT = 0dBm -10 0 VCC = 13.2 V RL = 4 W VOUT = 0dBm Rg = 620 W C.T. - f (OUT4) C.T. (dB) -20 -30 -40 -50 -60 -70 10 C.T. (dB) Cross talk Rg = 620 W -20 -30 -40 -50 -60 -70 10 Cross talk OUT4 (R) OUT1, 2, 3 OUT3 (R) OUT1, 2, 4 100 1k 10 k 100 k 100 1k 10 k 100 k Frequency f (Hz) Frequency f (Hz) 9 2002-02-13 TA8271H GV - f 40 35 70 60 PD - POUT (W) (dB) 30 25 20 15 10 VCC = 13.2 V 5 0 10 RL = 4 W VOUT = 0dBm 16 V 50 GV PD Power dissipation 40 13.2 V 30 20 9V 10 0 100 1k 10 k 100 k f = 1 kHz RL = 4 W 0 5 10 15 20 25 Voltage gain Frequency f (Hz) Output power POUT/ch (C) PD MAX -Ta 120 (w) (1) 100 Allowable power dissipation PD MAX. 80 (1) 60 INFINITE HEAT SINK RqJC = 1C/W (2) HEAT SINK (RqHS = 3.5C/W) RqJC + RqHS = 4.5C/W (3) NO HEAT SINK RqJA = 39C/W 40 20 (3) 0 0 25 50 75 (2) 100 125 150 Ambient temperature Ta (C) 10 2002-02-13 TA8271H Package Dimensions Weight: 7.7 g (typ.) 11 2002-02-13 |
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