TOSHIBA TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC TA8205AH, TA8205AL 18W BTLx2CH AUDIO POWER AMPLIFIER The thermal resistance 4j-T of TAS205AH, TAS205AL package designed for low thermal resistance, has a high efficiency of heat radiation. The temperature rise of chip can be reduced, and the influence from the degradation of the features due to the temperature rise at the high output can also be reduced, This stereo audio power IC, designed for car audio use, has two built-in channels to reduce the characteristic, difference between L and R channels In addition, the functions of stand-by and muting, and a variety of protection circuits are involved. FEATURES Low Thermal Resistance -T =1.5°C/W (Infinite Heat Sink) High Power Pour (1)=18W (Typ.)/Channel (ec =14.4V, f= 1kHz, THD = 10%, RL =40) Pout (2)=15W (Typ.)/Channel (ec =13.2V, f= 1kHz, THD = 10%, RL =42) Low Distortion Ratio : THD =0.04% (Typ.) (Vcc =13.2V, f= 1kHz, PouT=1W, RL=: 30mVyms (Typ.) (Voc =13.2V, RL=42, Gy Built-in Stand-by Function (With pin@ set at LOW, power is turned OFF.) Low Noise : Vin Built-in Muting Function (With pin® set at Low, power is turned OFF.) Built-in Various Protection Circuits Protection circuits ‘OUT Short. Operating Supply Voltage : Vcc=9~18V TA8205AH/AL TAR2OSAH oor WS y2ie17-9-2.00 TAR2O5AL — 2) HSIP17-2-2.00 Weight H71P17-P.2.00 : 9.89 (Typ) HSIP17-P-2.00 : 9.89 (Typ.) 9, Gy = 50dB) 19,, BW = 20H2~20kH2) 008, Rg Isp = 1A (Typ.) V (mute) = 1V (Typ) Thermal Shut Down, over voltage, out->Vcc short, out->GND short and OUT- OTORBA F conpmaly workman oe Se Gay © Fe Womaton coated he rd ata, & poate rerun, samara, ayer go ipo Sd case Sperating ranges a et forth nt SBS eR seondactar ‘he prodoce desert leat Feep in mind the’ pecavtene and cndone st tonk the athe datum ae subect to foreign exchange and foreign trade ls Tis nlomaton como here pracrcd ony a Suse spices of our odie, No regan i aumed by TOS ‘atc to change thous note, 1998-05-15 1/11TOSHIBA TA8205AH/AL BLOCK DIAGRAM TA8205AH, TA8205AL (Gy =50dB) Ovec 2) mute sw PROTECTOR Powero) Shemini ‘ea sit B04 ry ty feoe [eon encur Swrowerony 5% CAUTIONS AND APPLICATION METHOD (Description is made only on the single channel.) 1. Voltage gain adjustment By aed ‘mp 3, Amp 452048 ‘amp 3: FOWER Amp (atkmp) ‘amp &: POWER Amp (at-Amp) Fig.1 This IC has the amplifier construction as shown in Fig.1. The Pre-Amp. Amp 1 is provided to the primary stage, and the input voltage is amplified by the Flat Amps, Amp 3 and Amp 4 of each channel through the phase Amp. Amp 2. Since the input offset is prevented by Pre-Amp when Vcc is set to ON, this circuit can remarkably reduce the pop noise. 1998-05-15 2/11TOSHIBA TA8205AH/AL The total closed loop gain Gy of this IC can be obtained by expression below when the closed loop voltage gain of Amp 1 is Gyy Gy1 = 20809 oe (a8) a The closed loop voltage gain of POWER Amp, Amp 3 and Amp 4 is fixed at Gy; Therefore, the total closed circuit voltage gain Gy is © ‘obtained through BTL connection by the expression below. Gy =Gy1 +6y3 +6 (48) For example, when Ry= expressions (1) and (2) as shown below. 4 +20+6=50d8 The voltage gain is reduced when Rf is increased. (Fig.2) With the voltage gain reduced, since (1) the oscillation stability is reduced, and (2) the pop noise changes when Vcc is set to ON, refer to the items 3 and 4 Gys 2. Stand-by SW function By means of controlling pin@ (Stand-by terminal) to High and Low, the power supply can be set to ON and OFF. The threshold voltage of pin® is set at about 3V (Typ.), and the Power Supply current is about 1A (Typ.) at the stand-By state. Gyq = 208. sa @ g 1M, Gy is obtained by the a 3 3 a % a 3 FEEDBACK RESISTANCE. RF (Q) Fig.2 To bie Pin@ control voltage : V (SB) Ey cru STAND-BY | POWER | V(sp) (V) i ON OFF o~2 OFF ON 3~Vec Fig.3 With pin@ set to High, Power is turned ON. Advantage of stand-by SW (1) Since Ve¢ can directly be controlled to ON/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, 1998-05-15 3/11TOSHIBA TA8205AH/AL Lange curent capt sitch . a 4 U (Conventional Method) 0 (Standby Switch Method) 3. Preventive measure against oscillation For preventing the oscillation, it is advisable to use C4, the condenser of polyester film having small characteristic fluctuation of the temperature and the frequency. The resistance R to be series applied to Ca is effective for phase correction of high frequency, and improves the oscillation allowance. Since the oscillation allowance is varied according to the causes described below, perform the temperature test to check the oscillation allowance. (1) Voltage gain to be used (Gy Setting) (2) Capacity value of condenser (3) Kind of condenser (4) Layout of printed board In case of its use with the voltage gain Gy reduced or with the feedback amount increased, care must be taken because the phase-inversion is caused by the high frequency resulting in making the oscillation generated. 4, Input offset prevention circuit at Vec-90N Having Pre-Amp (Amp 1) mounted on the primary stage, this IC contains the circuit for making the Amp 1 input voltage and the NF terminal voltage equipotential Therefore, the offset voltage produced at the input stage is suppressed to prevent the pop noise at VccON. The capacity values of the input and NF condenser (C1 and C3) shall be set according to the gain to be used. (Reference) (A)At Gy=50dB (Ry =00) Cy = 47pF, C= 47 pF (8) At Gy=40dB (R¢=4702) Cy =3.3pF, C= 33) 1998-05-15 4/11TOSHIBA TA8205AH/AL 5. Muting function Through setting pin@ (mute terminal) at about 1V or less, muting becomes possible The interval circuit of IC is shown in Fig.4. When pin® is set to LOW, Q1 and Q2 are turned to ON, the charge of the ripple condenser is discharged and the bias is cut. The mute amount of 60dB or over can be obtained. Since this mute function rapidly discharges the charge of the ripple filter capacitor of pin®, the pop noise is generated by the DC fluctuation of the bias section. Therefore, this muting function is not appropriate to the audio muting but it is effective in muting at VccON. fs, a= KO. santo Fig.4 Mute circuit 6. External parts list and description NAME] RECOM. INFLUENCE Of. | MENDED | OBJECT SMALLER THAN TARGER THAN REMARKS PART VALUE RECOMMENDED VALUE | RECOMMENDED VALUE cr | 47uF |Dc blocking [Related to pop noise at Vcc>0N Related to gain Refer to item 4. Related to pop noise at Vcc>ON. Determination of low cut-off frequency Feedback 7, & 47HF | condenser qQ-—— ei RE ‘ 220, | Ripple Time constant is small_| Time constant is large 3 AF reduction at VecON or OFF. _| at Vec90N or OFF. T iiabl il lowan cq | oar |Ostllation Made liable to Oscillation allowance | peter ao item 3. prevention oscillate. improved. For filtering power supply hum and ripple. cs | 1000. |Ripple filter | Large at using AC rectified power supply. ‘Small at using DC power suppl 1998-05-15 5/11TOSHIBA TA8205AH/AL MAXIMUM RATINGS (Ta = 25°C) CHARACTERISTIC symeo. | RATING | UNIT Peak Supply Voltage (0.25) | Vec Gurae) 30 Vv DC Supply Voltage Vec (00) 25 v Operating Supply Voltage | Vcc (on) 18 Vv Output Current (Peak) Toipeak) 9 a Power Dissipation Pp 50 Ww (Operating Temperature Tope =30~85 | °C Storage Temperature Tag =55~150_| °€ ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Voc =13.2V, Ru =4N, f= 1kHz, Ta=25°C) Test CHARACTERISTIC symeot |cUR-| TEST CONDITION | MN. | TyP. | MAX. | UNIT curr (Quiescent Supply Current Tecq_| — [Vin=0 [720-250 [_ma Pour @ | — |Vec=144v, THD = 10% | — | 18] — Output Power Pour (2) | — [THD = 10% TL, — | ™ Total Harmonic Datorton a> | — lrour=1w — loos! oa] % Voltage Gain Gy = = a3 | 50] 52] 4B Rg=00, i — [Re=00 _ Output Noise Voltage Vno BW -20H2~20kH2 0.30 | 0.70 |mVrms Ripple Rejection Ratio RR - ao} sa| — | ap Input Resistance Rn | — = = 30 — a (Output Offset Voltage Vottset | — |Vin=0 =o3 [0] 03] mv Current at Stand-by State 158 = = = T]_10] pa Rg = 6000, cross Talk cr. — |Vour=0.75Vems — | | — | as (dBm) Stand-by OFF Pin® Control Voltage vse | — |(rowersony 25| — | vec] v > ‘Mute>0N Pin@ Control Voltage Vomute) | — [(power s0FF) — | 10] 20] v 1998-05-15 6/11TOSHIBA TA8205AH/AL TEST CIRCUIT TAS205AH, TAS205AL (Gy = 50dB) Ove S$ mr 50 PROTECTOR Power) {THERMAL SHUT DOWN rv @) fipsle stort acum oft Freamp| riatamp actveigh 3 Ofer) 1998-05-15 7/11TOSHIBA THD - Pout o3| o TOTAL HARMONIC DSTORNON THO. (6) Taras 7s i 380 ‘OUTPUT POWER Four CW) THD - Pout 3] TOTAL HARMONIC OSTORTION TD 96) o0s| ei or @3 188 ‘ourPuT POWER Pour CH TOTAL HARMONIC DSTORTON THO. (8) TOTAL MARION DSTOATION THO. (8) TA8205AH/AL THD - Pout re a ‘ourrur PoweR Pour OH THD -F een t320 os| a o3| 03] 3105500500 The Sk 10K TORSO FREQUENCY #02) 1998-05-15 8/11TOSHIBA TA8205AH/AL aR -f no ~ fa vec =132¥ z Ww i g mead z = ons, E 3) n-a z ‘oaan) | ewer 5 ng=1okct 2 os 3 3 oa “yr 30100000 aE He 00 ae OORT Frequency + tH) SIGNAL SOURCE RESSTANCE Rg (2) RR ~ Ry Pout - f neat 00% Vie =073¥ ne z ‘os ; z vec=132v neath Y 100 300 tk Sk 10k 30k 100k eyo 100300 SOR TODK SIONAL SOURCE RESSTANCE Ry (0) requancy ti) Po = Pour, Pp - Te mat, ane g © WAWTE HEAT SK ROiC= CW ef et ete oe = @ hear Sun dares) & OPERATION ce e 'RAIC+ ROWS =S°C/W : iS a 5 [2 wosesr tases 3 5 i i 32 5 5 tf 5 - S . & fet n g 2 JON 2 te 2 ft & fet Z eS r ° © 6 ry 16 20 * 8 120 7 uTPuT POWER Four AMQENT TENPERATURE Ta CO) 1998-05-15 9/77TOSHIBA TA8205AH/AL OUTLINE DRAWING HZIP17-P-2.00 Unit : mm. ——_ fi 170103 Vi 3992 10.010.3, | 5010.3 25751¥P 2.01, 0.5540.1 194 BOA] 41.2204 0.4 Bhs SeELeLEny 1 7 Bt Weight : 9.89 (Typ.) 7998-05-15 10/11TOSHIBA TA8205AH/AL OUTLINE DRAWING HSIP17-P-2.00 Unit : mm none 2023 >. a Rs Z i ° 2.5751YP 2.0T¥P, 0434s ss seae 1 7 Weight : 9.89 (Typ.) 7998-05-15 11/11