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| UTC7368P S w w a0.6W AUDIO POWER D AMPLIFIER . w DESCRIPTION The UTC7368P is suitable for the audio power amplifier of portable cassette tape recorder and radio. ta ee h 4U t om .c LI NEAR I NTEGRATED CI RCUI T FEATURES *Very few external components(only three capacitors) *Low quiescent current *High Voltage Gain:Gv=40dB BLOCK DIAGRAM Input ABSOLUTE MAXIMUM RATINGS(Ta=25C ) Characteristic Symbol Vcc Topr Tstg PD Supply Voltage Operating Temperature Storage Temperature Power dissipation w w w t a .D 1 3 Negative Feedback S a 4 2 e h 5 U t4 e 7 .c Vcc m o SIP-9 9 Ripple Rejection Output RL 6 Power GND Pre Phase GND Value 14 -20 to +75 -55 to 150 900 Unit V C C mW Note: Derated above Ta=25C in the proportion of 7.2mW/C YOUW ANG ELECTRONI CO. CS LTD w w w .D a aS t ee h 1 4U t om .c UTC7368P ELECTRICAL CHARACTERISTICS Characteristic Quiescent circuit current LI NEAR I NTEGRATED CI RCUI T Symbol ICCQ (Ta=25C,Vcc=6V,RL=4,RG=600,f=1kHz, unless otherwise specified) Test Condition Vcc=3V,Vi=0 Vcc=6V,Vi=0 Vcc=9V,Vi=0 Vcc=3V,RL=4,THD=10% Vcc=6V,RL=4,THD=10% Vcc=6V,RL=8,THD=10% Vcc=9V,RL=8,THD=10% Vcc=9V,RL=16,THD=10% Po=100mW Vi=0.5mVrms RG=10k BPF=20Hz~20kHz fr=100Hz,Vr=0.3Vrms, without Crip Min Typ. 5.5 6.6 7.5 120 720 450 1100 610 0.3 40 0.2 25 27 Max Unit mA mA mA mW mW mW mW mW % dB mVrms dB k Output Power Po 500 300 800 450 37 Total Harmonic Distortion Voltage Gain Output Noise voltage Ripple Rejection Input Resistance THD Gv VNO RR Ri 1.0 43 0.5 TERMINAL DC VOLTAGE Pin Number Value(V) 1 0 2 2.4 3 0.62 4 0.64 5 0 6 0 7 2.61 8 NC 9 6.0 PRECAUTION FOR APPLICATION 1. Input stage The input stage of power amplifier is comprised of a PNP differential Pair(Q2 and Q3) preceded by a PNP emitter follower(Q1) which allows DC referencing of the source signal to GND. This eliminated the need for an input coupling capacitor, However, in case the brush noise of volume becomes a problem, provide serially a coupling capacitor to the input side. 2. Adjustment of the Voltage Gain The voltage gain is fixed at Gv=40dB by the resistors(R4 and R5) in IC, its reduction is possible through adding Rf as shown In Fig.2 In this case, the voltage gain is obtained by the following equation: Gv=20*log*(R5+R4+Rf)/(R4+Rf)) It is recommended to use this IC with the voltage gain of Gv=28dB or over. Pin 9 Q2 Q3 R5 Pin 7 1 R4 R4 Pin 1 Q1 R1 27 Pin 5 Q4 Rf Pin 3 D1 3 R5 Crip 2 Fig.1 Fig.2 Fig.3 YOUW ANG ELECTRONI CO. CS LTD 2 UTC7368P 3. LI NEAR I NTEGRATED CI RCUI T Ripple Rejection Adding Crip, to the ripple terminal 2 as shown in Fig.3, the ripple rejection ratio is improved from -25dB to -45dB. 4. Power Dissipation Casre should be taken to use IC below maximum power dissipation. Because it may over maximum rating depending on operating condition. Pd=900mW(Ta=25) Phase-compensation Small temperature coefficient and excellent frequency characteristics is needed by capacitor below. *Oscillation preventing capacitor for power amplifier output *Bypass capacitor for ripple filter *Capacitor between Vcc and GND. 5. TEST CIRCUIT Vcc 100F 2 Ripple Rejection 9 Input 1 27k 10k 90 470F Output 7 RL 3 Negative Feedback 100F 4 Phase Pre GND 5 6 Power GND YOUW ANG ELECTRONI CO. CS LTD 3 UTC7368P LI NEAR I NTEGRATED CI RCUI T TYPICAL PERFORMANCE CHARACTERISTICS THD vs PD 100 100 THD vs PD 100 Voltage Gain vs Frequency Total Harmonic Distortion(%) Total Harmonic Distortion(%) f=1kHz RL=8 Ta=25k 10 10 Voltage Gain (dB) Vcc=6V RL=8 Ta=25k 80 Vcc=6V RL=4 Vin=1mVrms Vcc=3V 6V 9V 60 f=100Hz 1 40 1 f=1kHz f=10kHz 0.001 0.01 0.1 1 10 20 0.1 0.001 0.1 0.01 0.1 1 10 0 0.01 0.1 1 10 100 Output Power (W) Output Power (W) Frequency (kHz) Quscient Current and V7 vs Supply Voltage 10 Maximum Power Distortion vs. Supply Voltage Maximum power distortion (W) f=1kHz Ta=25k Power distortion (W) Power Distortion vs. Output Power Vcc=6V f=1kHz Ta=25k THD=1% 0.6 Quiscent current (mA) Quicevent Output Voltage (V) 8 ICCQ 0.8 0.8 6 0.6 V7 4 RL=4 0.4 8 16 32 THD=10% RL=4 0.4 2 0.2 0.2 RL=8 0 0 3 6 9 12 15 0 0 3 6 9 12 15 0 0 0.2 0.4 0.6 0.8 1.0 Supply Voltage (V) Supply Voltage (V) Output Power (W) YOUW ANG ELECTRONI CO. CS LTD 4 |
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