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| ICs for Audio Common Use AN5278 4.8 W x 1 (18 V, 8 ) Power Amplifier with Volume and Tone Control Unit : mm s Overview The AN5278 is a monolithic integrated circuit designed for 4.8 W x 1 channel OTL (18 V, 8 ) output audio power amplifier suitable for TV application. 19.90.1 18.30.25 2.650.1 8.40.25 5.80.25 1.50.25 6.3 0.3 7.1 0.25 3.750.25 0.5 0.1 1.2 0.25 15.0 * 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 12 V to 26 V (18 V typ.) 0.10.05 5.60.25 s Applications * TV HSIP009-P-0000 s Block Diagram Pre amp. 10 k AC mute Tone Volume 10 k 300 DC mute 5 6 7 8 9 1 2 3 Vol. 4 RF NF GND In LF Tone Out VCC 1.7 0.25 1.70.25 +0.1 0.45 -0.05 2.54 s Features 9 8 7 6 5 4 3 2 1 3.30.1 22.30.3 1 AN5278 s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 Sound input Low frequency input Tone control Volume control Ripple filter Negative feedback GND Sound output VCC Description ICs for Audio Common Use s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *3 *1 *2 Symbol VCC ICC PD Topr Tstg Rating 35.0 2 1.6 -20 to +70 -55 to +150 Unit V A W C C Operating ambient temperature Storage temperature *1 Note) *1 : Ta = 25 C except operating ambient temperature and storage temperature. *2 : Without input signal, VCC is up to 35 V. *3 : Power dissipation of the package at Ta = 70 C. s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 12 to 26 Unit V 2 ICs for Audio Common Use AN5278 s Electrical Characteristics at VCC = 18 V, RL = 8 , f = 1 kHz, Vol. = 5.0 V, Tone = 2.5 V, Ta = 25 C Parameter Quiescent current Voltage gain Total harmonic distortion Max. output power Max. output attenuation Symbol ICQ GV THD POmax Attmax Conditions No input signal Measure VCC current VO = 1 V[rms] GV = 20 log (VO/VIN) VO = 1 V[rms] BPF : 400 Hz to 30 kHz THD = 10 %, PO = VO2/RL VO = 1 V[rms] Vol. = max. min. Attmax = 20 log [VO (Vol. = min.) / VO (Vol. = max.)] Min 20 27 4.3 -66 Typ 27 30 0.4 4.8 -69 Max 48 33 1.0 Unit mA dB % W dB Tone variable range 1 GTC1 f = 15 kHz, VO = 1 V[rms] GTC = 20 log [VO (Tone = 5.0 V) / VO (Tone = 2.5 V)] GTC2 f = 15 kHz, VO = 1 V[rms] GTC = 20 log [VO (Tone = 0 V) / VO (Tone = 2.5 V)] 7 9 dB Tone variable range 2 -11 -9 dB * Design reference data Note) The characteristic values below are theoretical values for designing and not guaranteed. Parameter Input dynamic range Output DC bias Max. output power 1 Max. output power 2 Symbol DRIN VODC POmax1 POmax2 Conditions VVOL = 1 V vary VIN until output THD = 1 % No input signal Measure Pin8 DC THD = 10 %, VCC = 18.4 V PO = VO2/RL THD = 10 %, VCC = 26 V PO = VO2/RL Min Typ 4.5 Max Unit V[rms] 7.9 8.3 5 9 8.7 V W W 3 AN5278 s Application Circuit Example ICs for Audio Common Use In 1 LF 2 Tone 3 Vol. 4 RF 5 NF 6 GND 7 Out 8 VCC 9 Input 33 F 330 10 F 6.2 k 0.01 F 18 V 1000 F 100 F 10 F 470 F Line out 10 k Tone Speaker 8 5V 5V Volume Micom 100 330 47 F 1 Audio det. s Usage Notes 1) External heatsink is needed when used. External heatsink should be fixed to the chassis. 2) Fin of the IC can be connected to GND. 3) Please prevent output to VCC short, output to GND short and load short to GND. 4) The temperature protection circuit will operate at Tj around 150 C. However, if the temperature decreases, the protection circuit would automatically be deactivated and resume normal operation. 4 ICs for Audio Common Use s Technical Information 1.Characteristic Curve Chart * HSIP009-P-0000 Package power dissipation PD T a 11 10.4 10 9 8 4 Pmax < 1 2 3 Tjmax - Ta Rth No heat sink 5.5 x 5.0 cm2 A1 board (t = 1 mm) 7.5 x 7.5 cm2 A1 board (t = 1 mm) Infinity heat sink AN5278 Power dissipation PD (W) 4 6.65 7 6 5 4.14 3 4 2 3.36 3 1 2.5 2 1 0.0 0 25 50 70 75 100 125 150 2.63 2.15 1.6 Ambient temperature Ta (C) * ASO Area of Safe Operation 2 t = 100 ms 1 0.5 Ie (A) 0.2 0.1 0.05 0.02 0.01 1 2 5 10 20 35 50 100 VCB (V) 5 AN5278 s Technical Information (continued) 2.Application Note ICs for Audio Common Use 1) 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 R1 = 6.2 k, and C2 = 0.01 F, between pins 1 and 2 (other conditions : tone control voltage is set at 2.5 V, and volume control voltage is set at 5 V). Gain 30 dB LF 2 In 1 10 F VIN 6.2 k R1 C2 0.01 F Frequency The gain can be reduced by inserting a resistor Rf in series with the electrolytic capacitor at Pin6. Voltage gain = 20 log [10 k/(Rf + 300 )] 300 NF 6 10 k Out 8 Rf 10 F RL = 8 Bass boost can be easily implemented by inserting a series connection of RC between Pin8 (output) and Pin6 (NF). Example : Rb = 12 k, Cb = 0.022 F 300 NF 6 10 k Out 8 Rf Cb Rb RL = 8 6 ICs for Audio Common Use s Technical Information (continued) 2.Application Note (continued) AN5278 2) Tone characteristics When the tone control voltage (VT, at Pin3) is changed from 2.5 V to 5 V, the high frequency gain is increased gradually up by a max. of 9 dB. When VT is changed from 2.5 V to 0 V, the high frequency gain is decreased gradually down by a max. of -11 dB. By increasing the value of the capacitor at Pin2, the treble cut can be further decreased. Tone = 5 V +9 dB Gain (dB) 30 dB -11 dB Tone = 2.5 V Tone = 0 V 1 Frequency (kHz) 15 3) Volume characteristic The volume characteristic is logarithmic type. When the volume control voltage (VV, at Pin4) is 5 V, the gain is at max. (30 dB) ; that is, there is no attenuation. When VV is decreased, the gain is decreased at the same time. When VV is 0 V, the gain is at its minimum ; that is, there is max. attenuation, -69 dB. 0 Attenuation (dB) Tone = 2.5 V -69 0 4) Dynamic range The AN5278 has been designed, specially to have as large an input dynamic range as possible. The input D-range is about 4.5 V[rms], or 12.7 V[p-p] (conditions of measurement : VCC = 18 V, adjust the gain downwards by decreasing the volume control voltage). 1 2 3 Voltage (V) 4 5 7 AN5278 s Technical Information (continued) 2.Application Note (continued) ICs for Audio Common Use 5) Internal AC mute pulse (during power ON/OFF) The start-up response of the AN5278 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 : VCC = 18 V, CRF = 100 F, CNF = 10 F, CVCC = 1000 F. VCC Pin9 3.2 V 2.4 V VRF Pin5 3.6 V 3.6 V 2.8 V Output Pin8 310 ms Internal line mute pulse 660 ms Line out 590 ms 100 ms 8 ICs for Audio Common Use s Technical Information (continued) 2.Application Note (continued) AN5278 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 : VCC = 18 V, CRF = 100 F, CNF = 10 F, CVCC = 1000 F. Output Pin8 Internal DC mute pulse 300 ms 7) 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 : - 1. NF = 10 F * 2. NF = 22 F * RF = 100 F to 330 F RF = 220 F to 330 F * : Due to small NF capacitor, the low frequency cut-off is about 50 Hz. * : Due to larger RF capacitor, the start-up time is longer, about 1 second. 9 |
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