0.05 AN58.8 W (8 V, 8 Ω) Power Amplifier with Volume and Tone Control Overview The AN58 is a monolithic integrated circuit designed for.8 W channel OTL (8 V, 8 Ω) output audio power amplifier suitable for TV application. Features Few external components : No boucherot cells (output C, R) No bootstrap capacitors Built-in DC mute of input pin during power-off Operating voltage range V to 6 V (8 V typ.) 9.9±0. 8.3±0.5 φ.65±0. φ3.3±0. 0.±0.05 8.±0.5 5.8±0.5.5±0.5 5.0 5.6±0.5 6.3. ±0.3 ±0.5 9 8 6 5 3 Unit : mm 3.5±0.5 Applications TV HSIP009-P-0000 Block Diagram Pre amp. Tone Volume AC mute 300 Ω DC mute In LF Tone 3 Vol. RF 5 NF 6 GND Out 8 V CC 9 0.5 ±0.. ±0.5.±0.5.5 0.5 +0..3±0.3. ±0.5
AN58 Pin Descriptions Pin No. Description Sound input Low frequency input 3 Tone control Volume control 5 Ripple filter 6 Negative feedback GND 8 Sound output 9 V CC Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage * V CC 35.0 V Supply current I CC A Power dissipation *3 P D.6 W Operating ambient temperature * T opr 0 to +0 C Storage temperature * T stg 55 to +50 C Note) * : T a = 5 C except operating ambient temperature and storage temperature. * : Without input signal, V CC is up to 35 V. *3 : Power dissipation of the package at T a = 0 C. Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC to 6 V
AN58 Electrical Characteristics at V CC = 8 V, R L = 8 Ω, f = khz, Vol. = 5.0 V, Tone =.5 V, T a = 5 C Parameter Symbol Conditions Min Typ Max Unit Quiescent current I CQ No input signal 0 8 ma Measure V CC current Voltage gain G V V O = V[rms] 30 33 db G V = 0 log (V O /V IN ) Total harmonic distortion THD V O = V[rms] 0..0 % BPF : 00 Hz to 30 khz Max. output power P Omax THD = 0 %, P O = V O /R L.3.8 W Max. output attenuation Att max V O = V[rms] 66 69 db Vol. = max. min. Att max = 0 log [V O (Vol. = min.) / V O (Vol. = max.)] Tone variable range GTC f = 5 khz, V O = V[rms] 9 db GTC = 0 log [V O (Tone = 5.0 V) / V O (Tone =.5 V)] Tone variable range GTC f = 5 khz, V O = V[rms] 9 db GTC = 0 log [V O (Tone = 0 V) / V O (Tone =.5 V)] Design reference data Note) The characteristic values below are theoretical values for designing and not guaranteed. Parameter Symbol Conditions Min Typ Max Unit Input dynamic range DR IN V VOL = V.5 V[rms] vary V IN until output THD = % Output DC bias V ODC No input signal.9 8.3 8. V Measure Pin8 DC Max. output power P Omax THD = 0 %, V CC = 8. V 5 W P O = V O /R L Max. output power P Omax THD = 0 %, V CC = 6 V 9 W P O = V O /R L 3
AN58 Application Circuit Example Input 33 µf In 0 µf LF 6. kω Tone 3 Vol. RF 5 NF 6 GND Out 8 V CC 9 8 V 330 Ω 0.0 µf 00 µf 0 µf 0 µf 000 µf Line out Speaker 8 Ω 5 V 5 V Tone Volume 00 Ω 330 Ω µf Micom Audio det. Usage Notes ) External heatsink is needed when used. External heatsink should be fixed to the chassis. ) Fin of the IC can be connected to GND. 3) Please prevent output to V CC short, output to GND short and load short to GND. ) The temperature protection circuit will operate at T j around 50 C. However, if the temperature decreases, the protection circuit would automatically be deactivated and resume normal operation.
AN58 Technical Information.Characteristic Curve Chart HSIP009-P-0000 Package power dissipation Power dissipation P D (W) 0. 0 9 8 6 5. 3 3.36 3.5 P D T a 6.65.5.6 Pmax < Tjmax T a R th No heat sink 5.5 5.0 cm A board (t = mm) 3.5.5 cm A board (t = mm) Infinity heat sink.63 0.0 0 5 50 0 5 00 5 50 Ambient temperature T a ( C) ASO Area of Safe Operation t = 00 ms 0.5 I e (A) 0. 0. 0.05 0.0 0.0 5 0 0 35 50 00 V CB (V) 5
AN58 Technical Information (continued).application Note ) Gain setting and frequency response The gain is fixed to be 30 db by internal resistors. The frequency response is flat for the values of R = 6. kω, and C = 0.0 µf, between pins and (other conditions : tone control voltage is set at.5 V, and volume control voltage is set at 5 V). Gain 30 db In LF 0 µf 6. kω V IN R C 0.0 µf Frequency The gain can be reduced by inserting a resistor Rf in series with the electrolytic capacitor at Pin6. Voltage gain = 0 log [/(Rf + 300 Ω)] 300 Ω Bass boost can be easily implemented by inserting a series connection of RC between Pin8 (output) and Pin6 (NF). Example : Rb = kω, Cb = 0.0 µf NF 6 Out 8 NF 6 Out 8 Rf 0 µf R L = 8 Ω 300 Ω Rf Cb Rb R L = 8 Ω 6
AN58 Technical Information (continued).application Note (continued) ) Tone characteristics When the tone control voltage (V T, at Pin3) is changed from.5 V to 5 V, the high frequency gain is increased gradually up by a max. of 9 db. When V T is changed from.5 V to 0 V, the high frequency gain is decreased gradually down by a max. of db. By increasing the value of the capacitor at Pin, the treble cut can be further decreased. Tone = 5 V Gain (db) 30 db +9 db db Tone =.5 V Tone = 0 V 5 Frequency (khz) 3) Volume characteristic The volume characteristic is logarithmic type. When the volume control voltage (V V, at Pin) is 5 V, the gain is at max. (30 db) ; that is, there is no attenuation. When V V is decreased, the gain is decreased at the same time. When V V is 0 V, the gain is at its minimum ; that is, there is max. attenuation, 69 db. 0 Attenuation (db) Tone =.5 V 69 0 3 Voltage (V) 5 ) Dynamic range The AN58 has been designed, specially to have as large an input dynamic range as possible. The input D-range is about.5 V[rms], or. V[p-p] (conditions of measurement : V CC = 8 V, adjust the gain downwards by decreasing the volume control voltage).
AN58 Technical Information (continued).application Note (continued) 5) Internal AC mute pulse (during power ON/OFF) The start-up response of the AN58 is designed to be as smooth as possible. During power ON and OFF, the AC mute circuit turn on momentarily. The input signal and any external noise interference are being mute. The output DC level follows the rise and fall time of RF pin. Condition : V CC = 8 V, C RF = 00 µf, C NF = 0 µf, C VCC = 000 µf. V CC Pin9 3. V. V V RF Pin5 3.6 V 3.6 V.8 V Output Pin8 30 ms Internal line mute pulse 660 ms 590 ms 00 ms Line out 8
AN58 Technical Information (continued).application Note (continued) 6) Internal DC mute pulse (during power OFF) During power OFF, the decay response of the RF pin is being made use of internally, to generate an internal DC mute pulse. The output DC level is made to fall quickly. As the output level falls, any transient noise that happens prior to the input pin is effectively cut off from the IC. The residual electric charge in the large output capacitor (at Pin8) is discharged into the IC internal path. By this manner, at the next start-up, the output will start from almost 0 V, and reduce the occurrence of shock noise. Condition : V CC = 8 V, C RF = 00 µf, C NF = 0 µf, C VCC = 000 µf. Output Pin8 Internal DC mute pulse 300 ms ) Shock noise precaution During power ON, to reduce the occurence of Shock noise, please be careful when selecting suitable capacitor values for RF (Pin5) and NF (Pin6). Recommendation :. NF = 0 µf * RF = 00 µf to 330 µf * : Due to small NF capacitor, the low frequency cut-off is about 50 Hz.. NF = µf * RF = 0 µf to 330 µf * : Due to larger RF capacitor, the start-up time is longer, about second. 9