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| TA8275H TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8275H Max Power 41 W BTL 4 ch Audio Power IC The TA8275H 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, 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) = 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 ) * * * * * * * * 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 ) Low noise: VNO = 0.10 mVrms (typ.) (VCC = 13.2 V, Rg = 0 , GV = 26 dB, BW = 20 Hz~20 kHz) 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 : Thermal shut down, over voltage, out to GND, out to VCC, out to out short, speaker burned Operating supply voltage: VCC (opr) = 9~18 V 1 2002-02-13 TA8275H 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 CLIP OUT & DIAGNOSIS STBY OUT MUTE 4 25 22 R1 C4 : PRE-GND : PW-GND C3 2 2002-02-13 TA8275H 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. 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 TA8275H 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 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. 20 I (100 mA) IMUTE (OFF) 22 C4 R1 A (dB) 10 kW 0 5 kW Mute attenuation ATT IMUTE VMUTE -20 -40 -60 -80 -100 0 0.4 0.8 1 1.2 1.6 VCC = 13.2 V Po = 10 W PL = 4 W f = 1 kHz BW = 400~30 kHz 2 2.4 2.8 3 I (100 mA) IMUTE (OFF) 22 C4 R1 IMUTE VMUTE Point A voltage: VMUTE (V) Figure 4 Muting Function Figure 5 4 Mute Attenuation - VMUTE (V) 2002-02-13 TA8275H 4. AUX Input (pin 16) 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. 20 dB AMP. IN OUT (+) OUT (-) AUX AMP m-COM AUX-IN 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 V25 5V Q1 OVER VOLTAGE PROTECTOR GND t Q1 is turned on 25 OUTPUT SHORT PROTECTOR 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 m-COM LED/LCD ALAME (Flashing) (Announcement from a speaker.) (Relay OFF) 25 REGULATOR OFF MEMORY (Count and record) Figure 8 5.2 In Case of Shorting Output to Output Application 1 NPN Tr. (Q1) is turned on and off in response to the input signal voltage. 5 2002-02-13 TA8275H 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 ohm or less and output current over 4A 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.) 5.4 Application 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 4V if 25pin is pulled up to 5V line.) Output voltage of L.P.F. Operating point of protector 5V Output power Figure 10 6 2002-02-13 TA8275H 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 9. 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 9. In case of being unused this function, use this IC as open connection on pin 25. (Application) 5V 25 OUTPUT CLIP DETECTOR L.P.F. SMOOTHING CIRCUIT VOLUME CONTROL 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 TA8275H 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 (Note 1) Topr Tstg Rating 50 25 18 9 125 -40~85 -55~150 Unit V V V A W C C Note 1: 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 (Note 2) 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 (0 dBm) VOUT = 0.775 Vrms (0 dBm) Rg = 0 W, DIN45405 Rg = 0 W, BW = 20 Hz~20 kHz frip = 100 Hz, Rg = 620 W Vrip = 0.775 Vrms (0 dBm) Rg = 620 W VOUT = 0.775 Vrms (0 dBm) 3/4 3/4 Stand-by condition Power: ON Power: OFF Mute: OFF Mute: ON, R1 = 10 kW Mute: ON, VOUT = 7.75 Vrms (20 dBm) at Mute: OFF. 0 80 Test Condition Min 3/4 3/4 3/4 3/4 19 3/4 24 -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 26 0 0.12 0.10 50 65 0 90 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 28 dB 1.0 3/4 0.35 3/4 3/4 150 3/4 10 VCC 1.5 3/4 V dB mVrms dB dB mV kW mA V % W Unit mA 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 TA8275H 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 10 mF C2 CLIP OUT & DIAGNOSIS STBY OUT MUTE 4 25 22 10 kW R1 C4 1 mF 3900 mF : PRE-GND : PW-GND C3 0.1 mF C5 9 2002-02-13 TA8275H 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 9.0 V 100 Hz 0.1 13.2 V 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 OUT2 OUT3 RL = (mA) VIN = 0 300 ICCQ 200 Total harmonic distortion Quiescent current 0.01 OUT1 OUT4 100 VCC = 13.2 V RL = 4 W Pout = 5 W 0.001 10 100 1k 10 k 100 k 0 0 10 20 30 Power supply voltage VCC (V) Frequency f (Hz) 10 2002-02-13 TA8275H VNO - Rg 300 0 VCC = 13.2 V -10 -20 -30 -40 -50 RL = 4 W Rg = 620 W Vrip = 0dBm R.R. - f (mVrms) 200 Output noise voltage 150 100 Ripple rejection ratio R.R. (dB) VCC = 13.2 V RL = 4 W 250 BW = 20 Hz~20 kHz VNO 50 OUT1, 4 -60 -70 10 OUT2, 3 100 1k 10 k 100 k 0 10 100 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 -60 -70 10 C.T. (dB) Cross talk Rg = 620 W -20 -30 -40 -50 Cross talk OUT2 (R) OUT1, 3, 4 OUT1 (R) OUT2, 3, 4 100 1k 10 k 100 k -60 -70 10 100 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 OUT3 (R) OUT1, 2, 4 Rg = 620 W -20 -30 -40 -50 -60 -70 10 Cross talk OUT4 (R) OUT1, 2, 3 100 1k 10 k 100 k 100 1k 10 k 100 k Frequency f (Hz) Frequency f (Hz) 11 2002-02-13 TA8275H GV - f 40 35 70 60 PD - POUT (dB) 30 25 20 15 10 VCC = 13.2 V 5 0 10 RL = 4 W VOUT = 0dBm (W) GV PD 50 40 13.2 V 30 20 9V 10 0 16 V Power dissipation Voltage gain f = 1 kHz RL = 4 W 0 5 10 15 20 25 100 1k 10 k 100 k Frequency f (Hz) Output power POUT/ch (C) PD MAX -Ta 120 (w) INFINITE HEAT SINK RqJC = 1C/W HEAT SINK (RqHS = 3.5C/W) RqJC + RqJC = 4.5C/W NO HEAT SINK RqJA = 39C/W Allowable power dissipation PD MAX. 100 80 60 40 20 0 0 25 50 75 100 125 150 Ambient temperature Ta (C) 12 2002-02-13 TA8275H Package Dimensions Weight: 7.7 g (typ.) 13 2002-02-13 |
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