UNISONIC TECHNOLOGIES CO.,LTD. STEREO AUDIO AMPLIFIER DESCRIPTION The UTC is a monolithic integrated audio amplifier in a 6-pin plastic dual in line package. It is designed for portable cassette players and radios. FEATURES *Working Voltage down to V *Few External components *High Channel isolation *Voltage gain up to 45dB(Adjustable with external resistor) *Soft clipping *Internal Thermal protection DIP-6 *Pb-free plating product number: L ORDERING INFORMATION Order Number Normal Lead Free Plating Package Packing -D6-T L-D6-T DIP-6 Tube PIN CONFIGURATION BRIDGE 6 +Vs OUT. 5 OUT. BOOT. 4 BOOT. 4 5 FEEDBACK 6 FEEDBACK IN. (+) 0 IN. (+) SVR 9 (sub) Copyright 005 Unisonic Technologies Co.,LTD. QW-R0-00.B
BLOCK DIAGRAM 9 0 4 5 THERMAL PROTECTION 50Ω 0kΩ START CIRCUIT DECOUPLING 5kΩ 50Ω 6 0kΩ 50Ω 6 5 4 UNISONIC TECHNOLOGIES CO., LTD QW-R0-00.B
ABSOLUTE MAXIMUM RATINGS (Ta = 5 ) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V SS 5 V Peak Output Current I O (peak).5 A Junction Temperature T J 50 C Operating Temperature T OPR 0 ~ +0 Storage Temperature T STG -40 ~ +50 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.. The device is guaranteed to meet performance specification within 0 ~0 operating temperature range and assured by design from 0 ~5. ELECTRICAL CHARACTERISTICS (Ta=5, V CC =9V, Stereo, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Voltage V SS V Quiescent Current I Q 40 50 ma Quiescent Output Voltage V OUT 4.5 V Voltage Gain G V Stereo 4 45 4 db Bridge 49 5 5 Voltage Gain Difference ΔG V +- db Input Impedance R IN 0 kω R L =4Ω f=khz,thd=0%, V CC =9V.. R L =Ω Stereo per channel. Output Power R L =4Ω 0. V CC =6V R L =Ω P OUT 0.6 W R L =4Ω V CC =V 0. R L =Ω Bridge, V CC =9V 4. R L =4Ω V CC =6V. Total Harmonic Stereo V CC =9V, R L =4Ω, f=khz,p OUT =50mW 0..5 THD Distortion Bridge 0.5 % Supply Voltage Rejection SVR R G =0,AV=45Db,V RIPPLE =50mV F RIPPLE =00Hz 40 46 db R G =0.5 Input Noise Voltage Vn A V =00, Bandwidth:0Hz ~ 0kHz RG =0kΩ 6 μv Cross-Talk C.T. R G =0kΩ, f=khz,r L =4Ω, P OUT =W 40 55 db THERMAL CHARACTERISTICS PARAMETER SYMBOL RATINGS UNIT Thermal Resistance Junction to ambient θ JA 60 /W Thermal Resistance Junction to case θ JC 5 UNISONIC TECHNOLOGIES CO., LTD QW-R0-00.B
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. uf)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 (00uF) avoids a reduction of the output signal also at low frequencies and low supply voltages. Voltage Gain Adjust STEREO MODE (Figure ) The voltage gain is determined by on-chip resistors R and R together with the external RfC series connected between pin 6 () and ground. The frequency response is given approximated by: V OUT V IN = R R f + R + JWC With R f =0, C =00μF, the gain results 46 db with pole at f= Hz. THE purpose of Rf is to reduce the gain. It is recommended to not reduce it under 6 db. 6 () R (5) R f R C BRIDGE MODE (Figure ) Figure 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 pin 6 (inverting input of CH ) with a capacitor to pin and to connect to ground the pin. The total gain of the bridge is given by: and with the suggested values (C = C = 00 uf, R f = 0) means: Gv = 5 db with first pole at f = Hz UNISONIC TECHNOLOGIES CO., LTD 4 QW-R0-00.B
IN OUT OUT R R R R R R4 Figure Output Capacitors The low cut off frequency due to output capacitor depending on the load is given by: with C OUT 40uF and R L = 4 ohm it means F L = 0Hz. Pop Noise (Figure ) Most amplifiers similar to UTC need external resistors between DC outputs and ground in order to optimize the pop on/off performance and crossover distortion. OUT 00 Figure The UTC solution allows to save components because of such resistors (00 ohm) are included into the chip. Stability A good layout is recommended in order to avoid oscillations. Generally 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 (poliester) 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 O (and therefore P tot ) and Id are reduced. UNISONIC TECHNOLOGIES CO., LTD 5 QW-R0-00.B
TYPICAL APPLICATION CIRCUIT Vcc 00 F Vcc 00 F Vin 0. F 00 F 0 6 4 5 00 F 0.5 F Vin 0. F 00 F 0 6 4 5 00 F 0.5 F 40 F OUT RL 00 F 6 00 F 0.5 F RL Vin 0. F 00 F 6 00 F 0.5 F 40 F OUT RL 00 F 4,5,9,, 00 F 4,5,9,, Fig. 4 Bridge Application Fig.5 Stereo Application SCHEMATIC DIAGRAM UNISONIC TECHNOLOGIES CO., LTD 6 QW-R0-00.B
TYPICAL CHARACTERISTICS 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 QW-R0-00.B