AN5274 PANASONIC

Document overview

  • Manufacturer or author: Provided By digicamel.com
  • PDF pages: 7

Technical content

4.0 W · 2 (18 V, 8 W ) Power Amplifier with

Mute Function and Volume Control n Overview The AN5274 is a monolithic integrated circuit designed for 4.0 W (18 V, 8 W ) output audio power amplifier. It is a dual channel SEPP IC suitable for stereo operation in TV application. n Features

  • Built-in DC volume control
  • Built-in mute circuit
  • Built-in thermal protection circuit
  • Built-in over current protection circuit
  • Higher ripple rejection as compared to AN5273
  • V CC operating range : 14.2 V to 27.5 V n Applications
  • TV HSIP012-P-0000A Unit : mm Mute 1 In1 2 V ol.3 RR 4 In2 5 RF 6 Out2 7 NF2 8 GND 9 V CC NF1 11 Out1 12 V olume Ripple filter Over current thermal protection circuit 7.7–0.3 (12.5) 19.1–0.3 21.9–0.3 (1.2) (10.0)(10.0) 29.6–0.3 20.0–0.3 0.6 28.0–0.3 29.75–0.30 f3.6 R1.8 121 +0.15 –0.052.540.25 1.45–0.151.80–0.15 1.2–0.1 3.5–0.3 +0.10 –0.05 n Block Diagram Pin No. Description 7 Ch.2 output 8 Negative feedback ch.2

9 GND

10 V CC

11 Negative feedback ch.1 12 Ch.1 output Pin No. Description

1 Mute control

2 Ch.1 input

3 Volume control

4 Ripple rejection

5 Ch.2 input

6 Ripple filter

AN5274 ICs for Audio Common Use

  • Design reference data Note) The characteristic values below are theoretical values for designing and not guaranteed. Parameter Symbol Conditions Min Typ Max Unit Channel cross-talk CT V OUT = 1 V[rms], Volume = max. 47 57 ¾ dB Max. power dissipation P Dmax1 Use 10 °C/W heat sink ¾ 57W Max. power dissipation P Dmax2 V CC = 15.6 V, RL = 16 W¾ 1.9 ¾ W No heat sink Input dynamic range *2 DR IN THD = 1 %, PO = 1 W 6.1 7.2 ¾ V[p-p] Note) *2 : In order to measure input dynamic range correctly, it is necessary to reduce the gain by decreasing the DC volume to 1 V to 2 V. n Electrical Characteristics at VCC = 18 V, f = 1 kHz, RL = 8 W , Ta = 25 °C n Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V CC 29 V Supply current I CC 3.5 A Power dissipation *2 PD 37.5 W Operating ambient temperature *1 Topr -25 to +75 °C Storage temperature *1 Tstg -55 to +150 °C n Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC 14.2 to 27.5 V Note) *1 :T a = 25 °C except power dissipation, operating ambient temperature and storage temperature. *2 : Power dissipation of the package at Ta = 75 °C. Parameter Symbol Conditions Min Typ Max Unit Quiescent current I CQ No input signal 17 25 33 mA Voltage gain G V V IN = 90 mV 28 30 32 dB Total harmonic distortion *1 THD V IN = 90 mV ¾ 0.3 1.0 % Maximum power output *1 POmax THD = 10 % 3.6 4.1 ¾ W Channel balance CB V IN = 90 mV -10 1d B Max. volume attenuation *1 Att V IN = 90 mV ¾- 70 -64 dB Mute attenuation *1 M Att V IN = 90 mV ¾- 70 -64 dB Output noise voltage *1 V NO R g = 10 kW , Din-Audio Filter ¾ 0.6 1.0 mV[rms] Ripple rejection *1 RR V R = 280 mV[rms], fR = 100 Hz 30 35 ¾ dB R g = 10 kW Note) *1 : With a filter band from 20 Hz to 20 kHz used.

ICs for Audio Common Use AN5274 n Application Circuit Example Mute 1 In1 2 V ol. 3 RR 4 In2 5 RF 6 Out2 7 NF2 8 GND 9 V CC 10 NF1 11 Out1 12 AN5274 1 mF 0.047 mF 33 mF R L = 8 W R L = 8 W 18 V 10 kW 20 W 1 kW 20 kW 5 V 100 mF 1000 mF 1000 mF 1 mF3.3 mF 5 V 0.047 mF 10 mF

20 W1 kW

1) Depending on the maximum application output power, external heatsink may be needed. 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 and output to GND short. 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 Technical Information

  • HSIP012-P-0000A Package power dissipation PD ¾ Ta 62.5 70.0 0 25 150 Ambient temperature Ta (°C) Power dissipation PD (W) 50 75 100 125 41.7 25.0 31.3 10.0 20.0 30.0 40.0 50.0 60.0 10.4 3.0 17.9 0.0 R th (j-c) = 2 °C/W R th (j-a) = 42 °C/W 5 °C/W heat sink 2 °C/W heat sink 10 °C/W heat sink Without heat sink 3 °C/W heat sink Infinite heat sink 1 °C/W heat sink

AN5274 ICs for Audio Common Use C 33 mF R 22 kW 20 kW 1ON OFF 0 V Mute Threshold voltage at Pin1 : The purpose of the Mute is to attenuate the AC signal before it goes to the output. 5 V Z MUTE Mute OFF 0 V 1.8 V 2.1 V 5 V Mute ON n Technical Information (continued)

  • Application Note 1) Voltage gain The voltage gain of the AN5274 can be varied by changing the resistor R2 as shown below : R1 is always fixed at 20 kW . R2 is variable. G VO = 20 log (R1/R2) Typical values are : R1 = 20 kW , R2 = 1 kW G VO = 20 log (20 k/1 k) = 26 dB G VTOTAL = GVI + GVO = 4 dB + 26 dB = 30 dB 2) DC volume control The DC volume control range is 0 V to 5 V. This range is used in order to be easily controlled by micro-computer using PWM output. The recommended circuit and volume attenuation characteristic are shown below : 3) Mute control Mute is ON when 5 V is applied to Pin1. Then Q1 would turn ON and able to drive other part of the circuits. The external RC components provide a time constant for switching ON and OFF. Pin8 Pin7,12 C NF = 10 mF G V input= 4 dB which is fixed in internal circuit. G VI 12 kW 2.2 mF PWM output Microcomputer IC 18 kW Fig. V olume control interface circuit for AN5274 300 W AN5274 5 V V olume control Fig. V olume characteristic of AN5274 V olume attenuation 0 0.6 V olume at Pin35 (V)

ICs for Audio Common Use AN5274 n Technical Information (continued)

  • Application Note (continued) 4) Oscillation To prevent oscillation, it is advisable to use RC (Zobel network) at output. C of polyester film capacitor has smaller characteristic fluctuation with temperature and frequency. The resistor R connected in series with C is effective for phase correction at high frequency, and as a result, it improves the oscillation allowance. 0.047 mF R L = 8 W20 W C Pin7 R 1000 mF 5) Power-ON/OFF pop-noise elimination The output pins 7, 12 and VO , during power turns ON and OFF are shown below : The turn ON time in the AN5274 is determined by the capacitance value of CRF . If value of the CRF is smaller, VO will turn on faster. The turn OFF time is dependent on the capacitance value of CVCC . Pop-noise would occur when VCC voltage declines faster than RF voltage. To solve this, increase the discharge time of VCC by increasing the capacitance values of CVCC . The recommended values of capacitance for CVCC and CRF are shown below : C RF C VCC Recommended Operating VCC Range Unit 33 mF 470 mF 14.5 to 27.5 V RF 6 V CC 10 C VCCC RF V CC V O Pin7 Pin12 Turn ON time Turn OFF time C RF = 100 mF 33 mF 47 mF

AN5274 ICs for Audio Common Use n Technical Information (continued)

  • Application Note (continued) 6) Standby circuit Standby function can be implemented in the AN5274 by external solution. It is realised by pulling the RF voltage to low and output voltage would follow RF as shown in the diagram. 7) Ripple rejection improvement The ripple rejection of the AN5274 can be improved by another 15 dB by connecting a capacitor to Pin4. RF 1/2VCC 5 V 100 mFON OFF 5 V 5 V 0 V Stand-by DC voltage (Pin7 & Pin12) Time Stand-by V O (DC) RR 4 C RR Recommended capacitor CRR = 1.0 mF to 4.7 mF

ICs for Audio Common Use AN5274 n Technical Information (continued)

  • Characteristic Curve Chart PO , THD ¾ VIN PO ¾ VCC DC volume characteristics G V , THD ¾ f RR ¾ f Output power PO (W) Total harmonic distortion THD (%) 0.01 0.1 0.1 100 1000100101 Input voltage VIN (mV) V CC = 18 V R L = 8 W f = 1 kHz V ol. = max. PO THD 10 12 28 Supply voltage VCC (V) Output power PO (W) 14 16 18 20 22 24 26 f = 1 kHz THD = 10 % V ol. = max. R L = 8 W R L = 16 W -70 -60 -50 -40 -30 -20 -10 DC volume (V) Volume attenuation (dB) 4321 V CC = 18 V R L = 8 W V IN = 90 mV f = 1 kHz Voltage gain GV (dB) 100k10k1k10 100 Frequency f (Hz) G V V CC = 18 V R L = 8 W V IN = 90 mV V ol. = max.22 0.2 0.4 0.6 0.8 1.0 Total harmonic distortion THD (%) THD Ripple rejection (dB) 100k10k1k10 100 Frequency f (Hz) V CC = 18 V R L = 8 W V R = 280 mV V ol. = max. RR