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| ICs for Audio Common Use AN5274 4.0 W x 2 (18 V, 8 ) Power Amplifier with Mute Function and Volume Control Unit : mm 29.750.30 28.00.3 20.00.3 s 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 * VCC operating range : 14.2 V to 27.5 V R1.8 0.6 +0.10 0.25 -0.05 2.54 1 0.6 -0.05 (1.27) (10.0) +0.15 (12.5) 1.20.1 1.450.15 (1.2) 19.10.3 21.90.3 s Applications * TV HSIP012-P-0000A s Block Diagram Volume Over current thermal protection circuit 10 11 12 Ripple filter 1 2 3 4 5 6 7 8 Mute In1 Vol. RR In2 RF Out2 NF2 GND 9 s Pin Descriptions Pin No. 1 2 3 4 5 6 Description Mute control Ch.1 input Volume control Ripple rejection Ch.2 input Ripple filter Pin No. 7 8 9 10 11 12 Ch.2 output Negative feedback ch.2 GND VCC Negative feedback ch.1 Ch.1 output Description Out1 VCC NF1 1.800.15 3.50.3 29.60.3 The AN5274 is a monolithic integrated circuit designed for 4.0 W (18 V, 8 ) output audio power amplifier. It is a dual channel SEPP IC suitable for stereo operation in TV application. 12 (10.0) s Overview 7.70.3 3.6 (1.27) (1.3) 1 AN5274 s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *2 *1 ICs for Audio Common Use Symbol VCC ICC PD Topr Tstg Rating 29 3.5 37.5 -25 to +75 -55 to +150 Unit V A W C C Operating ambient temperature Storage temperature *1 Note) *1 : Ta = 25 C except power dissipation, operating ambient temperature and storage temperature. *2 : Power dissipation of the package at Ta = 75 C. s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 14.2 to 27.5 Unit V s Electrical Characteristics at VCC = 18 V, f = 1 kHz, RL = 8 , Ta = 25 C Parameter Quiescent current Voltage gain Total harmonic distortion Maximum power output Channel balance Max. volume attenuation Mute attenuation *1 *1 *1 *1 *1 Symbol ICQ GV THD POmax CB Att MAtt VNO RR Conditions No input signal VIN = 90 mV VIN = 90 mV THD = 10 % VIN = 90 mV VIN = 90 mV VIN = 90 mV Rg = 10 k, Din-Audio Filter VR = 280 mV[rms], fR = 100 Hz Rg = 10 k Min 17 28 3.6 -1 30 Typ 25 30 0.3 4.1 0 -70 -70 0.6 35 Max 33 32 1.0 1 -64 -64 Unit mA dB % W dB dB dB Output noise voltage Ripple rejection *1 1.0 mV[rms] dB Note) *1 : With a filter band from 20 Hz to 20 kHz used. * Design reference data Note) The characteristic values below are theoretical values for designing and not guaranteed. Parameter Channel cross-talk Max. power dissipation Max. power dissipation Input dynamic range *2 Symbol CT PDmax1 PDmax2 DRIN Conditions VOUT = 1 V[rms], Volume = max. Use 10 C/W heat sink VCC = 15.6 V, RL = 16 No heat sink THD = 1 %, PO = 1 W Min 47 6.1 Typ 57 5 1.9 7.2 Max 7 Unit dB W W 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. 2 ICs for Audio Common Use s Application Circuit Example AN5274 AN5274 VCC 10 Mute 1 22 k Audio mute 5V 33 F 1 F 3.3 F 5V 1 F 100 F 1000 F RL = 8 GND 9 20 k 0.047 F 20 10 F 1 k 18 V 10 F 1000 F 1 k 20 k 0.047 F 20 1000 F RL = 8 10 k s Usage Notes 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. s Technical Information * HSIP012-P-0000A Package power dissipation PD T a 70.0 Infinite heat sink 62.5 60.0 Rth (j-c) = 2 C/W Rth (j-a) = 42 C/W Power dissipation PD (W) 50.0 41.7 1 C/W heat sink 40.0 31.3 2 C/W heat sink 30.0 3 C/W heat sink 25.0 20.0 17.9 5 C/W heat sink 10.4 10 C/W heat sink 10.0 3.0 0.0 0 Without heat sink 25 50 75 100 125 150 Ambient temperature Ta (C) Out1 12 Out2 7 NF1 11 In1 2 Vol. 3 In2 5 RF 6 NF2 8 RR 4 3 AN5274 s Technical Information (continued) * Application Note ICs for Audio Common Use 1) Voltage gain The voltage gain of the AN5274 can be varied by changing the resistor R2 as shown below : GVI GV input= 4 dB which is fixed in internal circuit. Pin8 11 Pin7,12 R1 is always fixed at 20 k. R2 is variable. GVO = 20 log (R1/R2) Typical values are : R1 = 20 k, R2 = 1 k GVO = 20 log (20 k/1 k) = 26 dB GVTOTAL = GVI + GVO = 4 dB + 26 dB = 30 dB R1 CNF = 10 F R2 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 : AN5274 Volume attenuation Microcomputer IC R4 18 k C4 2.2 F 5 (V) Volume at Pin3 Fig. Volume characteristic of AN5274 0 0.6 R5 12 k PWM output 5V 300 3 Volume control Fig. Volume control interface circuit for AN5274 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. Mute ON 5 V 0V OFF R 22 k ZMUTE C 33 F 1 20 k Q1 The purpose of the Mute is to attenuate the AC signal before it goes to the output. 0V Threshold voltage at Pin1 : Mute OFF 1.8 V 2.1 V Mute ON 5V 4 ICs for Audio Common Use s Technical Information (continued) * Application Note (continued) AN5274 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. 1000 F C R 0.047 F 20 Pin7 12 RL = 8 5) Power-ON/OFF pop-noise elimination The output pins 7, 12 and VO, during power turns ON and OFF are shown below : VCC VO Pin7 & Pin12 33 F 47 F CRF = 100 F Turn ON time Turn OFF time CRF CVCC 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 : CRF 33 F CVCC 470 F Recommended Operating VCC Range 14.5 to 27.5 Unit V VCC 10 RF 6 5 AN5274 s Technical Information (continued) * Application Note (continued) ICs for Audio Common Use 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. DC voltage 5V RF 6 1/2VCC Stand-by 0V ON 100 F 5V 5V Stand-by Time (Pin7 & Pin12) VO (DC) OFF 7) Ripple rejection improvement The ripple rejection of the AN5274 can be improved by another 15 dB by connecting a capacitor to Pin4. Recommended capacitor CRR = 1.0 F to 4.7 F CRR 6 RR 4 ICs for Audio Common Use s Technical Information (continued) * Characteristic Curve Chart PO, THD VIN 10 VCC = 18 V RL = 8 f = 1 kHz Vol. = max. PO 100 AN5274 PO VCC 10 f = 1 kHz THD = 10 % Vol. = max. 8 Total harmonic distortion THD (%) Output power PO (W) 1 10 Output power PO (W) RL = 8 6 0.1 THD 4 RL = 16 1 2 0.01 1 10 100 0.1 1000 0 10 12 14 16 18 20 22 24 26 28 Input voltage VIN (mV) Supply voltage VCC (V) DC volume characteristics VCC = 18 V RL = 8 VIN = 90 mV f = 1 kHz GV, THD f 30 28 Volume attenuation (dB) Voltage gain GV (dB) -10 -20 -30 -40 -50 -60 -70 0 1 2 3 4 5 26 24 22 VCC = 18 V RL = 8 VIN = 90 mV Vol. = max. 1.0 0.8 0.6 THD 0.4 0.2 0 100k 10 100 1k 10k DC volume (V) Frequency f (Hz) RR f 50 Ripple rejection (dB) 40 RR 30 20 VCC = 18 V RL = 8 VR = 280 mV Vol. = max. 10 100 1k 10k 100k Frequency f (Hz) Total harmonic distortion THD (%) 0 GV 7 |
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