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| ICs for Audio Common Use AN5272 4.0 W x 2 (18 V, 8 ) Power Amplifier with Variable Audio Output and Volume Control Unit : mm 29.750.30 28.00.3 20.00.3 s Features * Built-in DC volume control * Built-in thermal protection circuit * Built-in over current protection circuit * 2 Variable Audio Output (VAO) * VCC operating range : 12.2 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 VAO1 In1 Vol. VAO2 In2 9 Out2 GND Out1 NF2 RF VCC NF1 1.800.15 3.50.3 29.60.3 The AN5272 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 AN5272 s Pin Descriptions Pin No. 1 2 3 4 5 6 Description Variable audio output 1 Ch.1 input Volume control Variable audio output 2 Ch.2 input Ripple filter Pin No. 7 8 9 10 11 12 ICs for Audio Common Use Description Ch.2 output Negative feedback ch.2 GND VCC Negative feedback ch.1 Ch.1 output s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *2 *1 Symbol VCC ICC PD Topr Tstg Rating 30 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 12.2 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 Output power *1 *1 Symbol ICQ GV THD PO CB *1 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 Min 17 28 Typ 25 30 0.3 Max 33 32 1.0 Unit mA dB % W 3.6 -1 4.1 0 -70 1 -64 14 Channel balance Max. volume attenuation VAO voltage gain Output noise voltage *1 dB dB dB Att GVAO VNO 10 12 0.6 1.0 mV[rms] Note) *1 : With a filter band from 20 Hz to 20 kHz used. 2 ICs for Audio Common Use s Application Circuit Example AN5272 AN5272 NF1 11 Out1 12 VCC 10 VAO1 1 VAO2 4 Out2 7 NF2 8 Vol. 3 In1 2 In2 5 RF 6 1 F 1 F 5V 1 F 10 k 1 F 100 F 1000 F RL = 8 20 k 0.047 F 20 GND 9 20 k 10 F 1000 F 1 k 18 V 0.047 F 20 10 F 1 k 1000 F RL = 8 Variable audio output 1 Variable audio output 2 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. 3 AN5272 s Technical Information 1.Characteristic Curve Chart PO, THD VIN 10 VCC = 18 V RL = 8 f = 1 kHz Vol. = max. PO 100 30 ICs for Audio Common Use GV, THD f Total harmonic distortion THD (%) 28 1 10 26 24 22 VCC = 18 V RL = 8 VIN = 90 mV Vol. = max. 1.0 0.8 0.6 0.4 THD 0.2 0 100k 0.1 THD 1 0.01 1 10 100 0.1 1000 10 100 1k 10k Input voltage VIN (mV) Frequency f (Hz) GVAO f 14 12 GV 8 10 f = 1 kHz THD = 10 % Vol. = max. PO VCC Voltage gain GVAO (dB) 10 8 6 4 2 VCC = 18 V RL = 8 VIN = 90 mV Vol. = max. Output power PO (W) RL = 8 6 4 RL = 16 2 0 10 100 1k 10k 100k 0 10 12 14 16 18 20 22 24 26 28 Frequency (Hz) Supply voltage VCC (V) DC volume characteristics VCC = 18 V RL = 8 VIN = 90 mV f = 1 kHz PD T a 62.5 7 60 Rth( j-c) = 2 C/W Rth( j-a) = 42 C/W 1. No heat sink 2. 10 C/W heat sink 3. 5 C/W heat sink 4. 3 C/W heat sink 5. 2 C/W heat sink 6. 1 C/W heat sink 7. Infinity heat sink 0 Volume attenuation (dB) -10 50 PD (W) -20 -30 -40 -50 -60 -70 0 1 2 3 4 5 41.7 6 40 31.3 5 30 4 25 20 3 17.9 10.4 2 10 3.0 0 0 1 25 50 75 100 125 150 DC volume (V) Ta (C) 4 Total harmonic distortion THD (%) GV Output power PO (W) Voltage gain GV (dB) ICs for Audio Common Use s Technical Information (continued) 2.Application Note 1) Voltage gain The voltage gain of the AN5272 can be varied by changing the resistor R2 as shown below : Pin7,12 Pin8 11 AN5272 GVI GV input = 4 dB which is fixed in internal circuit. R1 is always fixed at 20 k. R2 is variable. GVO = 20 log (R1/R2) R1 CNF = 10 F 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 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 : AN5272 Microcomputer IC R4 18 k C4 2.2 F R5 12 k PWM output Volume attenuation 300 3 Volume control Fig. Volume control interface circuit for AN5272 5 (V) Volume at Pin3 Fig. Volume characteristic of AN5272 0 0.6 3) 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. Pin7 12 C R 1000 F 0.047 F 20 RL = 8 5 AN5272 s Technical Information (continued) 2.Application Note (continued) ICs for Audio Common Use 4) Power-ON/OFF pop-noise elimination The output pins 7, 12 and VO, during power turn ON and OFF are shown below : VCC VO 33 F Pin7 & Pin12 47 F CRF = 100 F Turn ON time Turn OFF time CRF CVCC The turn ON time in the AN5272 is determined by the capacitance value of CRF. If value of the CRF is smaller, VO would 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 : No. 1 2 3 CRF 33 F 47 F 100 F CVCC 470 F 470 F 1000 F Recommended Operating VCC Range 14.5 to 27.5 12.2 to 27.5 12.2 to 27.5 Unit V V V 5) Stand-by circuit Stand-by function can be implemented in the AN5272 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 6 VCC 10 RF 6 |
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