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TA8275H 2002-02-13 1 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: p out max = 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 v cc /gnd short and over voltage input mode. additionally, the aux amplifier and various kind of protector for car audio use are built-in. features high power : p out max (1) = 41 w (typ.) (v cc = 14.4 v, f = 1 khz, jeita max, r l = 4 ? ) : p out max (2) = 37 w (typ.) (v cc = 13.7 v, f = 1 khz, jeita max, r l = 4 ? ) : p out (1) = 24 w (typ.) (v cc = 14.4 v, f = 1 khz, thd = 10%, r l = 4 ? ) : p out (2) = 21 w (typ.) (v cc = 13.2 v, f = 1 khz, thd = 10%, r l = 4 ? ) built-in output clipping detection and diagnosis circuit (pin 25) low distortion ratio: thd = 0.02% (typ.) (v cc = 13.2 v, f = 1 khz, p out = 5 w, r l = 4 ? ) low noise: v no = 0.10 mvrms (typ.) (v cc = 13.2 v, r g = 0 ? , g v = 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 v cc , out to out short, speaker burned operating supply voltage: v cc (opr) = 9~18 v weight: 7.7 g (typ.)
TA8275H 2002-02-13 2 block diagram r l r l r l 11 9 8 7 5 2 3 17 18 19 21 24 23 12 15 14 1 20 6 r l in1 in2 in3 aux in in4 13 16 c 1 c 1 c 1 c 1 pre-gnd 10 25 4 22 out1 ( ) pw-gnd1 out1 ( ) out2 ( ) pw-gnd2 out2 ( ) out3 ( ) pw-gnd3 out3 ( ) out4 ( ) pw-gnd4 out4 ( ) tab v cc1 v cc2 c 3 r 1 c 4 c 2 : pre-gnd : pw-gnd stby clip out & diagnosis out rip mute c 5 c 6
TA8275H 2002-02-13 3 figure 2 with pin 4 set to high, power is turned on on 4 off 10 k to bias cutting circuit 2v be v cc power 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. the voltage gain of amp.1: g v1 0 db the voltage gain of amp.2a, b: g v2 20 db the voltage gain of blt connection: g v (btl) 6 db therefore, the total voltage gain is decided by expression below. g v g v1 g v2 g v (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 3v be (typ.), and the power supply current is about 2 a (typ.) at the stand-by state. control voltage of pin 4: v sb stand-by power v sb (v) on off 0~1.5 off on 3~v cc adjustage of stand-by sw (1) since v cc can directly be controlled to on or 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 amp. 1 input amp. 2a amp. 2b figure 1 block diagram
TA8275H 2002-02-13 4 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 r 1 and c 4 and these parts is related the pop noise at power on/off. the series resistance; r1 must be set up less than 10 k to get enough muting attenuation. the muting function have to be controlled by a transistor, fet and -com port which has i mute 250 a 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. ? conventional method ? v cc large current capacity switch battery v cc from microcomputer battery relay v cc small current capacity switch battery stand-by v cc directly from microcomputer battery stand-by ? stand-by switch method ? figure 3 figure 5 mute attenuation v mute (v) point a voltage: v mute (v) att ? v mute mute attenuation att (db) 10 k 5 k v cc 13.2 v p o 10 w pl 4 f 1 khz bw 400~30 khz 100 0 0.4 0.8 1 1.2 1.6 2 2.4 2.8 3 80 60 40 20 0 20 figure 4 muting function r 1 i (100 a) 22 i mute i mute (off) a v mute c 4 r 1 i (100 a) 22 i mute i mute (off) v mute c 4
TA8275H 2002-02-13 5 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 -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. 5. 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. 5.1 in case of shorting output to v cc /gnd or over voltage power supplied npn tr. (q1) is turned on. threshold of over voltage protection: v cc 22 v (typ.) 5.2 in case of shorting output to output npn tr. (q1) is turned on and off in response to the input signal voltage. 25 5 v led/lcd alame regulator off (flashing) (announcement from a speaker.) (relay off) -com memory (count and record) figure 8 application 1 figure 6 aux input 20 db amp. in out ( ) out ( ) 16 aux-in 20 db aux amp -com figure 7 self diagnosis output pin 25: open collector output (active low) q1 is turned on gnd 5 v t v25 output short protector over voltage protector 25 q1 5 v
TA8275H 2002-02-13 6 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. abnormal output offset voltage (voltage between out+ and out-) over 4v is made by the external circuit failure.(note1) the speaker impedance becomes 1 ohm or less as it is in a rare short circuit condition. the current more than 4a flows into the speaker and the speaker is burned. 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.) current into a speaker speaker impedance less than 4 figure 9 about 1 4 operating point of protector output voltage of l.p.f. output power 5 v figure 10 operating point of protector
TA8275H 2002-02-13 7 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. (a) 5 v t ac (a) output (ac wave form) (b) t dc (b) clip detector circuit (internal) (c) t dc (b) clip detector terminal (pin 25) gnd figure 12 clip detection figure 11 pin 25: open collector output (active low) output clip detector 25 5 v l.p.f. smoothing circuit volume control circuit tone control circuit (application)
TA8275H 2002-02-13 8 maximum ratings (ta 25c) characteristics symbol rating unit peak supply voltage (0.2 s) v cc (surge) 50 v dc supply voltage v cc (dc) 25 v operation supply voltage v cc (opr) 18 v output current (peak) i o (peak) 9 a power dissipation p d (note 1) 125 w operation temperature t opr 40~85 c storage temperature t stg 55~150 c note 1: package thermal resistance
j-t 1c/w (typ.) (ta 25c, with infinite heat sink) electrical characteristics (unless otherwise specified, v cc 13.2 v, f 1 khz, r l 4 , ta 25c) characteristics symbol test circuit test condition min typ. max unit quiescent current i ccq v in 0 200 400 ma p out max (1) v cc 14.4 v, max power 41 p out max (2) v cc 13.7 v, max power 37 p out (1) v cc 14.4 v, thd 10% 24 output power p out (2) thd 10% 19 21 w total harmonic distortion thd p out 5 w 0.02 0.2 % voltage gain g v v out 0.775 v rms (0 dbm) 24 26 28 voltage gain ratio g v v out 0.775 v rms (0 dbm) 1.0 0 1.0 db v no (1) rg 0 , din45405 0.12 output noise voltage v no (2) rg 0 , bw 20 hz~20 khz 0.10 0.35 mv rms ripple rejection ratio r.r. f rip 100 hz, rg 620 v rip 0.775 v rms (0 dbm) 40 50 db cross talk c.t. rg 620 v out 0.775 v rms (0 dbm) 65 db output offset voltage v offset 150 0 150 mv input resistance r in 90 k stand-by current i sb stand-by condition 2 10 a v sb h power: on 3.0 v cc stand-by control voltage v sb l power: off 0 1.5 v v m h mute: off open mute control voltage (note 2) v m l mute: on, r 1 10 k 0 0.5 v mute attenuation att m mute: on, v out 7.75 vrms (20 dbm) at mute: off. 80 90 db note 2: muting function have to be controlled by open and low logic, which logic is a transistor, fet and -com port of i mute 250 a ability. this means than the mute control terminal : pin 22 must not be pulled-up.
TA8275H 2002-02-13 9 test circuit r l r l r l 11 9 8 7 5 2 3 17 18 19 21 24 23 12 15 14 1 20 6 r l in1 in2 in3 in4 13 c 1 c 1 c 1 c 1 pre-gnd 10 25 4 22 out1 ( ) pw-gnd1 out1 ( ) out2 ( ) pw-gnd2 out2 ( ) out3 ( ) pw-gnd3 out3 ( ) out4 ( ) pw-gnd4 out4 ( ) tab v cc1 v cc2 c 3 r 1 c 4 1 f c 2 : pre-gnd : pw-gnd stby clip out & diagnosis out rip mute 3900 f 0.22 f 0.22 f 0.22 f 10 f 10 k c 5 0.1 f 0.22 f aux in 16 0.22 f c 6
TA8275H 2002-02-13 10 quiescent current i ccq (ma) output power p out (w) t. h. d ? p out total harmonic distortion t.h.d (%) power supply voltage v cc (v) i ccq ? v cc frequency f (hz) t. h. d ? f total harmonic distortion t.h.d (%) output power p out (w) t. h. d ? p out total harmonic distortion t.h.d (%) v cc 13.2 v r l 4 0.1 100 1 10 0.01 0.1 1 10 100 10 khz 1 khz 100 hz 0.1 f 1 khz r l 4 1 0.1 100 0.01 110 10 100 13.2 v 16.0 v 9.0 v 10 0 30 20 0 400 100 200 300 r l v in 0 0.001 1 0.01 0.1 100 10 100 k 1 k 10 k v cc 13.2 v r l 4 p out 5 w out3 out4 out2 out1
TA8275H 2002-02-13 11 cross talk c.t. (db) cross talk c.t. (db) signal source resistance r g ( ) v no ? r g output noise voltage v no ( v rms ) frequency f (hz) r.r. ? f ripple rejection ratio r.r. (db) frequency f (hz) c.t. ? f (out1) cross talk c.t. (db) frequency f (hz) c.t. ? f (out2) frequency f (hz) c.t. ? f (out3) frequency f (hz) c.t. ? f (out4) cross talk c.t. (db) 100 10 100 k 1 k 10 k 0 300 50 200 100 150 250 v cc 13.2 v r l 4 bw 20 hz~20 khz 100 10 100 k 1 k 10 k 70 0 60 30 40 20 50 10 v cc 13.2 v r l 4 v out 0dbm r g 620 out1 out2, 3, 4 100 10 100 k 1 k 10 k 70 0 60 30 40 20 50 10 out2 out1, 3, 4 v cc 13.2 v r l 4 v out 0dbm r g 620 100 10 100 k 1 k 10 k 70 0 60 30 40 20 50 10 out3 out1, 2, 4 v cc 13.2 v r l 4 v out 0dbm r g 620 100 10 100 k 1 k 10 k 70 0 60 30 40 20 50 10 out4 out1, 2, 3 v cc 13.2 v r l 4 v out 0dbm r g 620 100 100 k 1 k 10 k 10 70 0 60 30 40 20 50 10 v cc 13.2 v r l 4 r g 620 v rip 0dbm out2, 3 out1, 4
TA8275H 2002-02-13 12 frequency f (hz) g v ? f voltage gain g v (db) output power p out /ch (c) p d ? p out power dissipation p d (w) ambient temperature ta (c) p d max ?ta allowable power dissipation p d max. (w) 25 0 150 0 120 75 60 100 40 20 80 100 50 125 infinite heat sink r jc 1c/w heat sink (r hs 3.5c/w) r jc r jc 4.5c/w no heat sink r ja 39c/w 0 10 40 30 50 20 60 70 5 15 20 10 25 0 9 v 13.2 v 16 v f 1 khz r l 4 100 10 100 k 1 k 10 k 0 40 5 20 15 25 10 30 35 v cc 13.2 v r l 4 v out 0dbm
TA8275H 2002-02-13 13 package dimensions weight: 7.7 g (typ.)
TA8275H 2002-02-13 14 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. 000707ebf restrictions on product use

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