UNISONIC TECHNOLOGIES CO., LTD STEREO AUDIO AMPLIFIER DESCRIPTION The UTC is a monolithic integrated circuit that intended for use as dual or bridge power audio amplifier portable radio cassette players. FEATURES * Dual or bridge connection modes. * Few external components. * Supply voltage down to V. * High channel separation. * Very low switch on\off noise. * Max gain of 45dB with adjust external resistor. * Soft clipping. * Thermal protection. * V<V CC <5V * P=*W,V CC =6V,R L =4Ω * P=*.W,V CC =9V,R L =4Ω * P=*0.W,V CC =V,R L =4Ω SOP-0 *Pb-free plating product number: L ORDERING INFORMATION Order Number Normal Lead Free Plating Package Packing -S0-R L-S0-R SOP-0 Tape Reel -S0-T L-S0-T SOP-0 Tube L-S0-R ()Packing Type ()Package Type ()Lead Plating () R: Tape Reel, T: Tube () S0: SOP-0 () L: Lead Free Plating, Blank: Pb/Sn of 8 Copyright 005 Unisonic Technologies Co., Ltd
PIN CONFIGURATION BRIDGE 0 Vcc OUT 9 OUT BOOT 8 BOOT 4 7 5 6 6 5 7 4 FEEDBACK 8 FEEDBACK IN (+) 9 IN (+) SVR 0 (Sub) UNISONIC TECHNOLOGIES CO., LTD of 8
BLOCK DIAGRAM (Sub ) IN + FEED BOOT OUT THERMAL PROTECT START CIRCUIT 50Ω - + 0kΩ 5kΩ SVR DECOUPLING Vss + BRIDGE IN + - + 0kΩ 50Ω 50Ω FEED BOOT OUT UNISONIC TECHNOLOGIES CO., LTD of 8
ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage V SS 5 V Output Peak Current I O(PEAK).5 A Junction Temperature T J 50 C Storage Temperature T STG 50 C Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Thermal Resistance Junction-case θ JC 5 C/W Thermal Resistance Junction-ambient θ JA 65 C/W Note: The θ JA is measured with 4 cm copper area heatsink. ELECTRICAL CHARACTERISTICS (Ta=5 C, V CC =9V, Stereo unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Voltage V SS V Quiescent Current I Q 5 50 ma Quiescent Output Voltage V OUT 4.5 V Voltage Gain G V Stereo 4 45 47 db Bridge 49 5 5 db Voltage Gain Difference G V(DIFF) ± db Input Impedance R I 0 kω R L =4Ω 0. V SS =V R L =Ω 0.0 R L =4Ω 0.7 R L =8Ω 0.6 V SS =6V R L =6Ω P OUT Stereo 8 (per channel) 0.5 R L =Ω 0. Output Power (d=0%) R L =4Ω.7. V SS =9V R L =8Ω. W R L =8Ω V SS =V.4 R L =6Ω 0.8 V SS =V R L =Ω 0.06 R L =4Ω P OUT Bridge.8 V SS =6V R L =8Ω.5 R L =8Ω V SS =9V 4.7 Distortion Stereo 0..5 % d V SS =9V; R L =4Ω Bridge 0.5 % Supply Voltage Rejection SVR f=00hz,v R =0.5V,Rg=0 40 46 db Input Noise Voltage en (IN) Rg=0.5 mv Rg=04Ω 6 mv Cross-Talk CT f=khz, Rg=0KΩ 40 5 db UNISONIC TECHNOLOGIES CO., LTD 4 of 8
APPLICATION INFORMATION Input Capacitor Input capacitor is PNP type allowing source to be referenced to ground. In this way no input coupling capacitor is required. However, a series capacitor(0.µf) to the input side can be useful in case of noise due to variable resistor contact. Bootstrap The bootstrap connection allows to increase the output swing. The suggested value for the bootstrap capacitors (00µF) avoids a reduction of the output signal also at low frequencies and low supply voltage. Voltage Gain Adjust STEREO MODE The voltage gain is determined by on-chip resistors R and R together with the external RfC series connected between pin 8() and ground. The frequency response is given approximated by: VOUT R = VIN Rf +R+ JWC With Rf=0,C=00µF, the gain results 46dB with pole at f=hz The purpose of RfI is to reduce the gain. It is recommended to not reduce it under 6dB. BRIDGE MODE Figure 7 8() Rf C R 50 R 0K (9) The bridge configuration is realized very easily thanks to an internal voltage divider which provides (at pin )the CH output signal after reduction. It is enough to connect pin8(inverting input of CH )with a capacitor to pin and to connect to ground the pin 9. The total gain of the bridge is given by: VOUT R = (+ R VIN Rf +R+ R4 JWC and with the suggested values (C=C=00µF,Rf=0)means: Gv=5dB R ) R+R4+ JWC Figure 8 IN OUT R 0K R R 0K R R 5K R4 50 OUT With first pole at f=hz UNISONIC TECHNOLOGIES CO., LTD 5 of 8
APPLICATION INFORMATION(Cont.) Output Capacitors. The low cut off frequency due to output capacitor depending on the load is given by: FL = πcout *RL With C OUT 470µF and R L =4 ohm it means F L =80Hz. Stability A good layout is recommended in order to avoid oscillations. In general, the designer must pay attention on the following points: -Short wires of components and short connections. -No ground loops. -Bypass of supply voltage with capacitors as nearest as possible to the supply I.C. pin. The low value (polyester) capacitors must have good temperature and frequency characteristics. -No sockets. The heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no device damage in the case of excessive junction temperature: all that happens is that P OUT (and therefore P D ) and Id are reduced. APPLICATION SUGGESTION The recommended values of the components are those shown on stereo application circuit of Fig. different values can be used, the following table can help the designer. Component Recommended Purpose Larger Than Smaller Than Input DC Decoupling in Case of C,C 0.µF Slider Contact Noise of Variable Resistor C 00µF Ripple Rejection Degradation of SVR, Increase of THD at Low Frequency and Low Voltage C4,C5 00µF Bootstrap C6,C7 470µF Output DC Decoupling Increase of Low Frequency Cut-off C8,C9 0.5µF Frequency Stability Danger of Oscillations C0,C 00µF Inverting Input DC Decoupling Increase of Low Frequency Cut-off UNISONIC TECHNOLOGIES CO., LTD 6 of 8
TYPICAL APPLICATION CIRCUIT Figure :Bridge Application (Powerdip) Figure :Stereo Application (Powerdip) +V8 +V8 00µF 00µF IN 0.µF 00 µf 00µF 00µF 0 8 9 8 TEA 05D 0 4,5,6,7,, 4,5,6,7 9 00µF 00µF 0.5µF 0.5µF RL IN. IN. C0 00µF C C C 00µF C 0.µF 0.µF 00 µf 0 8 9 8 0 TEA 05D 4,5,6,7,, 4,5,6,7 9 C4 00µF C8 0.5µF C5 00µF C9 0.5µF C6 470µF OUT. RL C7 470µF OUT. RL UNISONIC TECHNOLOGIES CO., LTD 7 of 8
TYPICAL CHARACTERISTICS 50 Supply Current vs.supply Voltage (RL=4Ω) I(mA) 8 Output Voltage vs. Supply Voltage VOUT(V) 7 40 6 5 0 4 0 0 6 9 STEREO 5 STEREO 0 6 9 5 Vss(V) Vss(V) Output Power vs. Supply Voltage (THD=0%,f=KHz) PoUT(W).5 0 THD vs. Output Power (f=khz,vss=6v) THD(%).5 RI=4Ω RI=8Ω RI=6Ω RI=8Ω RI=4Ω.5 RI=6Ω 0.5 0 6 9 Vss(V) STEREO 5 0. 0 0. 0.4 PoUT(W) STEREO 0.6 0.8 UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD 8 of 8