AN5278 PANASONIC | Alldatasheet

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Technical content

4.8 W · 1 (18 V, 8 W ) Power Amplifier with

The AN5278 is a monolithic integrated circuit designed for 4.8 W · 1 channel OTL (18 V, 8 W ) output audio power amplifier suitable for TV application. n 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 12 V to 26 V (18 V typ.) n Applications
  • TV HSIP009-P-0000 Unit : mm In 1 LF 2 Tone 3 V ol.4 RF 5 NF 6 7GND Out 8 V CC Tone V olume DC mute AC mute Pre amp. 10 kW 10 kW 300 W n Block Diagram f3.3–0.10.1–0.05 5.6–0.25 –0.25 1.7 1.7–0.25 0.45 +0.1–0.05 3.75–0.25 0.5 –0.1 1.2 –0.25 2.54 15.0 19.9–0.1 18.3–0.25 5.8–0.25 1.5–0.25 –0.3 –0.25 22.3–0.3

AN5278 ICs for Audio Common Use n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage *2 V CC 35.0 V Supply current I CC 2A Power dissipation *3 PD 1.6 W Operating ambient temperature *1 Topr -20 to +70 °C Storage temperature *1 Tstg -55 to +150 °C n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC 12 to 26 V Note) *1 :T a = 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. Pin No. Description

1 Sound input

2 Low frequency input

3 Tone control

4 Volume control

5 Ripple filter

6 Negative feedback

7 GND

8 Sound output

ICs for Audio Common Use AN5278

  • 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 = 1 V 4.5 V[rms] vary VIN until output THD = 1 % Output DC bias V ODC No input signal 7.9 8.3 8.7 V Measure Pin8 DC Max. output power 1 P Omax1 THD = 10 %, VCC = 18.4 V 5 W PO = VO 2/RL Max. output power 2 P Omax2 THD = 10 %, VCC = 26 V 9 W PO = VO 2/RL n Electrical Characteristics at VCC = 18 V, RL = 8 W , f = 1 kHz, Vol. = 5.0 V, Tone = 2.5 V, Ta = 25 °C Parameter Symbol Conditions Min Typ Max Unit Quiescent current I CQ No input signal 20 27 48 mA Measure VCC current Voltage gain G V V O = 1 V[rms] 27 30 33 dB G V = 20 log (VO /VIN) Total harmonic distortion THD V O = 1 V[rms] ¾ 0.4 1.0 % BPF : 400 Hz to 30 kHz Max. output power P Omax THD = 10 %, PO = VO 2/RL 4.3 4.8 ¾ W Max. output attenuation Att max V O = 1 V[rms] -66 -69 ¾ dB Vol. = max. fi min. Attmax = 20 log [VO (Vol. = min.) / VO (Vol. = max.)] Tone variable range 1 DGTC1 f = 15 kHz, VO = 1 V[rms] 7 9 ¾ dB DGTC = 20 log [VO (Tone = 5.0 V) / VO (Tone = 2.5 V)] Tone variable range 2 DGTC2 f = 15 kHz, VO = 1 V[rms] ¾- 11 -9d B DGTC = 20 log [VO (Tone = 0 V) / VO (Tone = 2.5 V)]

AN5278 ICs for Audio Common Use n 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. n Application Circuit Example Speaker 8 W V olume 5 V 100 mF 0.01 mF Tone 470 mF 10 mF 10 mF33 mFInput 47 mF 1000 mF 18 V6.2 kW 10 kW 330 W 330 W In 1 LF 2 Tone 3 V ol.4 RF 5 NF 6 7GND Out 8 V CC 9 Line out 5 V 1 Audio det. Micom 100 W

ICs for Audio Common Use AN5278 n Technical Information 1.Characteristic Curve Chart

  • HSIP009-P-0000 Package power dissipation PD ¾ Ta 10.4 0 25 150 Ambient temperature Ta (°C) Power dissipation PD (W) 50 75 70 100 125 3.36 4.14 2.5 0.0 Pmax < Tjmax - Ta R th

1 No heat sink

2 5.5 · 5.0 cm2 A1 board (t = 1 mm) 3 7.5 · 7.5 cm2 A1 board (t = 1 mm)

4 Infinity heat sink

1.6 6.65 2.15 2.63

  • ASO Area of Safe Operation t = 100 ms V CB (V) Ie (A) 5 10 20 50 100 35 0.01 0.02 0.05 0.1 0.2 0.5

AN5278 ICs for Audio Common Use n Technical Information (continued) 2.Application Note 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 kW , and C2 = 0.01 mF, 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). The gain can be reduced by inserting a resistor Rf in series with the electrolytic capacitor at Pin6. Voltage gain = 20 log [10 kW /(Rf + 300 W )] Bass boost can be easily implemented by inserting a series connection of RC between Pin8 (output) and Pin6 (NF). Example : Rb = 12 kW , Cb = 0.022 mF In 1 LF 2 0.01 mF 10 mF Frequency 30 dB V IN Gain 6.2 kW NF 6 Out 8 R L = 8 W Rf 10 kW Cb Rb 300 W NF 6 Out 8 R L = 8 W Rf 10 mF 10 kW300 W

ICs for Audio Common Use AN5278 n Technical Information (continued) 2.Application Note (continued) 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. 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 V V is 0 V, the gain is at its minimum ; that is, there is max. attenuation, -69 dB. 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). 30 dB Gain (dB) Frequency (kHz) 11 5 +9 dB -11 dB Tone = 5 V Tone = 2.5 V Tone = 0 V 0123 V oltage (V) -69 Tone = 2.5 V Attenuation (dB)

AN5278 ICs for Audio Common Use n Technical Information (continued) 2.Application Note (continued) 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 mF, CNF = 10 mF, CVCC = 1000 mF. V CC Pin9 3.2 V 2.4 V 2.8 V 3.6 V 3.6 V 100 ms 590 ms660 ms 310 ms V RF Pin5 Output Pin8 Internal line mute pulse Line out

ICs for Audio Common Use AN5278 n Technical Information (continued) 2.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 : VCC = 18 V, CRF = 100 mF, CNF = 10 mF, CVCC = 1000 mF. 7) Shock noise precaution During power ON, to reduce the occurence of ʠShockʡ noise, please be careful when selecting suitable capacitor values for RF (Pin5) and NF (Pin6). Recommendation : - 1. NF = 10 mF * RF = 100 mF to 330 mF * : Due to small NF capacitor, the low frequency cut-off is about 50 Hz. 2. NF = 22 mF * RF = 220 mF to 330 mF * : Due to larger RF capacitor, the start-up time is longer, about 1 second. Output Pin8 Internal DC mute pulse 300 ms