4.0 W 2 (8 V, 8 Ω) Power Amplifier with Mute Function and Volume Control Overview The is a monolithic integrated circuit designed for 4.0 W (8 V, 8 Ω) output audio power amplifier. It is a dual channel SEPP IC suitable for stereo operation in TV application. 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 : 4.2 V to 27. 29.75±0.30 7.7±0.3 (2.5) (.2) 9.±0.3 2.9±0.3 Unit : mm Applications TV HSIP02-P-0000A Volume Ripple filter Over current thermal protection circuit Mute In 2 Vol. 3 RR 4 In2 5 RF 6 Out2 7 NF2 8 GND 9 V CC 0 NF Out 2 28.0±0.3 20.0±0.3.2±0. (0.0) (0.0) 0.6 φ3.6 R.8 2 +0.5 0.6 0.05 (.27) (.27) (.3) +0.0 0.25 0.05 2.54.45±0.5.80±0.5 3.5±0.3 29.6±0.3 Block Diagram Pin Descriptions Pin No. Description Mute control 2 Ch. input 3 Volume control 4 Ripple rejection 5 Ch.2 input 6 Ripple filter Pin No. Description 7 Ch.2 output 8 Negative feedback ch.2 9 GND 0 V CC Negative feedback ch. 2 Ch. output
ICs for Audio Common Use Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V CC 29 V Supply current I CC 3.5 A Power dissipation *2 P D 37.5 W Operating ambient temperature * T opr 25 to +75 C Storage temperature * T stg 55 to +50 C Note) * : T a = 25 C except power dissipation, operating ambient temperature and storage temperature. *2 : Power dissipation of the package at T a = 75 C. Recommended Operating Range Parameter Symbol Range Unit Supply voltage V CC 4.2 to 27. Electrical Characteristics at V CC = 8 V, f = khz,, T a = 25 C Parameter Symbol Conditions Min Typ Max Unit Quiescent current I CQ No input signal 7 25 33 ma Voltage gain G V V IN = 90 mv 28 30 32 db Total harmonic distortion * THD V IN = 90 mv 0.3.0 % Maximum power output * P Omax THD = 0 % 3.6 4. W Channel balance CB V IN = 90 mv 0 db Max. volume attenuation * Att V IN = 90 mv 70 64 db Mute attenuation * M Att V IN = 90 mv 70 64 db Output noise voltage * V NO R g = 0 kω, Din-Audio Filter 0.6.0 mv[rms] Ripple rejection * RR V R = 280 mv[rms], f R = 00 Hz 30 35 db R g = 0 kω Note) * : 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 Symbol Conditions Min Typ Max Unit Channel cross-talk CT V OUT = V[rms], Volume = max. 47 57 db Max. power dissipation P Dmax Use 0 C/W heat sink 5 7 W Max. power dissipation P Dmax2 V CC = 5.6 V, R L = 6 Ω.9 W No heat sink Input dynamic range *2 DR IN THD = %, P O = W 6. 7.2 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 V to 2 V. 2
Application Circuit Example 22 kω Audio mute Mute In 2 33 µf Vol. 3 RR 4 In2 5 3.3 µf µf µf 0 kω RF 6 00 µf 000 µf Out2 7 NF2 8 20 kω 0.047 µf GND 9 0 µf 20 Ω kω V CC 0 NF 0 µf 000 µf kω 8 V Out 2 20 kω 0.047 µf 20 Ω 000 µf Usage Notes ) 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 V CC short and output to GND short. 4) The temperature protection circuit will operate at T j around 50 C. However, if the temperature decreases, the protection circuit would automatically be deactivated and resume normal operation. Technical Information HSIP02-P-0000A Package power dissipation P D T a 70.0 62.5 60.0 Infinite heat sink R th (j c) = 2 C/W Rth (j a) = 42 C/W Power dissipation P D (W) 50.0 4.7 C/W heat sink 40.0 3.3 2 C/W heat sink 30.0 3 C/W heat sink 25.0 20.0 7.9 5 C/W heat sink 0.4 0.0 0 C/W heat sink Without heat sink 3.0 0.0 0 25 50 75 00 25 50 Ambient temperature T a ( C) 3
ICs for Audio Common Use Application Note ) Voltage gain The voltage gain of the can be varied by changing the resistor R2 as shown below : G VI Pin7,2 R is always fixed at 20 kω. R2 is variable. G V input= 4 db which is fixed in internal circuit. Pin8 R C NF = 0 µf G VO = 20 log (R /R 2 ) Typical values are : R = 20 kω, R 2 = kω G VO = 20 log (20 k/ k) = 26 db R2 G VTOTAL = G VI + G VO = 4 db + 26 db = 30 db 2) DC volume control The DC volume control range is 0 V to. 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 : Microcomputer IC Volume attenuation 300 Ω 3 R4 8 kω R5 2 kω PWM output Volume control C4 2.2 µf Fig. Volume control interface circuit for 0 0.6 5 (V) Volume at Pin3 Fig. Volume characteristic of 3) Mute control Mute is ON when is applied to Pin. Then Q 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 0 V OFF ON R 22 kω Z MUTE C 33 µf 20 kω Q The purpose of the Mute is to attenuate the AC signal before it goes to the output. Threshold voltage at Pin : 0 V.8 V 2. V Mute OFF Mute ON 4
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. Pin7 2 C R 000 µf 0.047 µf 20 Ω 5) Power-ON/OFF pop-noise elimination The output pins 7, 2 and V O, during power turns ON and OFF are shown below : V CC V O Pin7 & Pin2 33 µf 47 µf C RF = 00 µf RF 6 C RF V CC 0 C VCC Turn ON time Turn OFF time The turn ON time in the is determined by the capacitance value of C RF. If value of the C RF is smaller, V O will turn on faster. The turn OFF time is dependent on the capacitance value of C VCC. Pop-noise would occur when V CC voltage declines faster than RF voltage. To solve this, increase the discharge time of V CC by increasing the capacitance values of C VCC. The recommended values of capacitance for C VCC and C RF are shown below : C RF C VCC Recommended Operating V CC Range Unit 33 µf 470 µf 4.5 to 27. 5
ICs for Audio Common Use Application Note (continued) 6) Standby circuit Standby function can be implemented in the 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 ON Stand-by 0 V OFF RF 00 µf 6 /2V CC (Pin7 & Pin2) V O (DC) Stand-by Time 7) Ripple rejection improvement The ripple rejection of the can be improved by another 5 db by connecting a capacitor to Pin4. RR 4 Recommended capacitor C RR =.0 µf to 4.7 µf C RR 6
Characteristic Curve Chart P O, THD V IN P O V CC Output power P O (W) 0 0. V CC = 8 V RL = 8 Ω f = khz THD P O 00 0 Total harmonic distortion THD (%) Output power P O (W) 0 8 6 4 2 f = khz THD = 0 % R L = 6 Ω 0.0 0 00 0. 000 0 0 2 4 6 8 20 22 24 26 28 Input voltage V IN (mv) Supply voltage V CC (V) DC volume characteristics G V, THD f Volume attenuation (db) 0 0 20 30 40 50 60 V CC = 8 V RL = 8 Ω VIN = 90 mv f = khz Voltage gain G V (db) 30 28 26 24 22 V CC = 8 V RL = 8 Ω VIN = 90 mv G V THD.0 0.8 0.6 0.4 0.2 Total harmonic distortion THD (%) 70 0 2 3 4 5 0 00 k 0k 0 00k DC volume (V) Frequency f (Hz) RR f 50 Ripple rejection (db) 40 30 20 RR V CC = 8 V V R = 280 mv 0 00 k Frequency f (Hz) 0k 00k 7