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TA8255AH 2002-10-30 1 toshiba bipolar linear integrated circuit silicon monolithic TA8255AH max power 22w btl 4ch audio power ic the TA8255AH is 4ch btl audio power amplifier for consumer application. it is designed low distortion ratio for 4ch btl audio power amplifier, built ? in stand ? by function, muting function and junction temperature detection circuit. additionally, the aux. amplifier is built ? in, it can make the beep signal etc. output to 2 channels (out 1 and 4). it contains various kind of protectors for car audio. features high power : p out (max) = 22 w (typ.) (v cc = 1 3.7 v, f = 1 khz, r l = 4 ? ) : p out ( 1 ) = 1 7 w (typ.) (v cc = 1 4.4 v, f = 1 khz, thd = 1 0%, r l = 4 ? ) : p out (2) = 1 4 w (typ.) (v cc = 1 3.2 v, f = 1 khz, thd = 1 0%, r l = 4 ? ) low distortion ratio : thd = 0.02% (typ.) (v cc = 1 3.2 v, f = 1 khz, p out = 3 w, r l = 4 ? ) low noise : v no = 0. 1 0 mv rms (typ.) (v cc = 1 3.2 v, r g = 0 ? , g v = 34 db, bw = 20~20 khz) built ? in stand ? by switch function (pin(2)) built ? in muting function (pin( 1 ), (25)) built ? in aux. amplifier from single input to 2 channels output (pin( 1 6)) built ? in junction temperature detection circuit (pin(24)) : pin(24) dc voltage rises at about + 1 0 mv / c in proportion to junction temperature. built ? in various protection circuit : thermal shut down, over voltage, out to gnd, out to v cc , out to out short operating supply voltage : v cc (opr) = 9~ 1 8 v weight: 9.8g (typ.)
TA8255AH 2002-10-30 2 block diagram
TA8255AH 2002-10-30 3 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 v 1 = 0 db the voltage gain of amp. 2a, b: g v2 = 28 db the voltage gain of btl connection: g v (btl) = 6 db therefore, the total voltage gain is decided by expression below. g v = g v 1 + g v2 + g v (btl) = 0 + 28 + 6 = 34 db 2. stand by sw function by means of controlling pin(2) (stand by terminal) to high and low, the power supply can be set to on and off. the threshold voltage of pin(2) is set at about 3v (typ.), and the power supply current is about 1 00 a (typ.) at the stand by state. control voltage of pin(2): v (sb) stand by power v (sb) (v) on off 0~2 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
TA8255AH 2002-10-30 4 3. preventive measure against oscillation for preventing the oscillation, it is advisable to use c 4 , the condenser of polyester film having small characteristic fluctuation of the temperature and the frequency. the resistance r to be series applied to c 4 is effective for phase correction of high frequency, and improves the oscillation allowance. ( 1 ) capacity value and the kind of condenser (2) layout of printed board 4. junction temperature detecting pin(24) using temperature characteristic of a band gap circuit and in proportion to junction temperature, pin(24) dc voltage: v 2 rises at about + 1 0mv / c temperature characteristic. so, the relation between v 2 at t j = 25c and v 2x at t j = xc is decided by the following expression: c) 25( c 10mv / c) (25 2 v 2x v c) t(x in deciding a heat sink size, a junction temperature can be easily made clear by measuring voltage at this pin while a backside temperature of ic was so far measured using a thermocouple type thermometer.
TA8255AH 2002-10-30 5 5. muting function: pin( 1 ), pin(25) by means of controlling pin(25) (mute control terminal) less than about 1 .5 v, it can make the ic muting condition as below. however, pin(25) must not be connected to a certain voltage, for example, v cc , v dd , v ref , etc. in other words, pin(25) is inhibited to be pulled up, for instance fig 5 application. the attenuation by the muting function is 70 db (typ.). this muting is very smooth attenuating by the time constant of pin( 1 ): smoothing. therefore, this function is suitable to the audio muting. the time for attenuation: tatt is adjustable by changing the capacitance of c 3 . but the tatt may influence the popping noise level. so, please decide the time of tatt by testing on the units. 6. aux. amplifier: pin( 1 6) the pin( 1 6) is for input terminal of aux. amplifier. the total gain is 0 db by using of aux. amplifier. therefore, the con can directly drive the aux. amplifier.
TA8255AH 2002-10-30 6 the amplified signal from pin( 1 6) is out to the out 1 and 4. 7. cross talk the cross talk characteristics of the ic is not good between out 1 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 out 1 and 4. ex) out1 front aux. out out2 rear l ch (or r ch) ? out3 rear ? out4 fromt r ch (or l ch) aux. out
TA8255AH 2002-10-30 7 maximum rating (ta = 25c) characteristic symbol rating unit peak supply voltage (0.2 s) v cc (surge) 50 v dc supply voltage v cc (dc) 25 v operating supply voltage v cc (opr) 18 v output current (peak) i o (peak) 9 a power dissipation p d (*) 83 w operating temperature t opr 40~85 c storage temperature t stg 55~150 c (*) package thermal resistance j t = 1.5c / 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) characteristic symbol test cir cuit test condition min. typ. max. unit quiescent current i ccq ? v in = 0 ? 200 400 ma p out (max) ? v cc = 13.7 v, max power ? 22 ? p out (1) ? v cc = 14.4 v, thd = 10% ? 17 ? output power p out (2) ? thd = 10% 10 14 ? w total harmonic distortion thd ? p out = 3 w ? 0.02 0.2 % voltage gain g v ? v out = 0.775 v rms (0 dbm) 32 34 36 db voltage gain ratio ? g v ? v out = 0.775 v rms (0 dbm) 1.0 0 1.0 db v no (1) ? r g = 0 ? , din45405 ? 0.12 ? mv rms output noise voltage v no (2) ? r g = 0 ? , bw = 20 hz~20 khz ? 0.10 0.35 mv rms ripple rejection ratio r.r. ? f rip = 100hz, r g = 620 ? v rip = 0.775 v rms (0 dbm) 40 55 ? db cross talk c.t. ? r g = 620 ? , v out = 0.775 v rms (0 dbm) ? 75 ? db output offset voltage v offset ? ? 300 0 +300 mv input resistance r in ? ? ? 30 ? k ? stand by current i sb ? stand by condition ? 100 150 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 (*) v m l ? mute: on 0 ? 1.5 v mute attenuation att m ? mute: on ? 70 ? db (*) muting function must be controlled by open and low logic. this means that the mute control terminal: pin(25) must not be pulled up.
TA8255AH 2002-10-30 8 test circuit (gv = 34 db)
TA8255AH 2002-10-30 9
TA8255AH 2002-10-30 10
TA8255AH 2002-10-30 11
TA8255AH 2002-10-30 12 package dimensions weight: 9.8g (typ.)
TA8255AH 2002-10-30 13 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. 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. 000707eb a restrictions on product use

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