UTC TA7368P LINEAR INTEGRATED CIRCUIT 0.6W AUDIO POWER AMPLIFIER DESCRIPTION The UTC TA7368P is suitable for the audio power amplifier of portable cassette tape recorder and radio. FEATURES *Very few external components( only three capacitors) *Low quiescent current *High voltage gain: Gv=40dB SIP-9 BLOCK DIAGRAM Vcc 2 9 Ripple Rejection Input 1 Output 7 RL 3 Negative Feedback UTC 4 Phase 5 Pre GND 6 Power GND UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R107-009,A UTC TA7368P LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUN RATINGS (Ta=25°C) SYMBOL VALUE Supply Voltage PARAMETER VCC 14 V Power Dissipation PD 900 mW -20 ~ 75 °C -55 ~ 150 °C Operating Temperature TOPR Storage Temperature TSTG Note: Derated Ta>25°C, in the proportion of 7.2mW/°C UNIT ELECTRONIC CHARACTERISTICS(Ta=25°C, Vcc=6V, f=1kHz, Rg=600Ω,RL=4Ω, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS Quiescent Circuit Current ICCQ Voltage Gain GV MIN TYP VCC=3V,Vin=0 5.5 VCC=6V,Vin=0 6.6 VCC=9V,Vin=0 7.5 Vin=0.5mVrms 37 40 VCC=3V,RL=4Ω,THD=10% Output Power Pout Total Harmonic UNIT mA 43 dB 120 VCC=6V,RL=4Ω,THD=10% 500 VCC=6V,RL=8Ω,THD=10% 300 450 VCC=9V,RL=8Ω,THD=10% 800 1100 VCC=9V,RL=16Ω,THD=10% 450 610 THD MAX 720 mW Pout=100mW 0.3 1 % 0.5 mVrms Distortion Output Noise Voltage Vno Rg=10kΩ,BPF=20Hz~20kHz 0.2 Ripple Rejection RR fr=100Hz,Vr=0.3Vrms,Crip=0 25 dB Input Resistance Rin 27 kΩ TERMINAL DC VOLTAGE Pin No. 1 2 3 4 5 6 7 8 9 Value(V) 0 2.4 0.62 0.64 0 0 2.61 NC 6 PRECAUTION FOR APPLICATION 1. Input stage (Figure 1) 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 eliminates 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 (figure 2) 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 Figure 2. In this case, the voltage gain is obtained by the following equation: Gv=20log(R5+R4+Rf)/(R4+Rf). It is recommended to use this IC with the voltage gain of Gv=28dB or over. UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R107-009,A UTC TA7368P LINEAR INTEGRATED CIRCUIT Pin 9 Q2 Q3 R5 1 Pin 7 R4 R4 Pin 1 Q1 2 3 Q4 Rf Pin 3 R1 27¦¸ Crip R5 D1 Pin 5 Figure 1 Figure 2 Figure 3 3. Ripple rejection (Figure 3) Adding Crip, to the ripple terminal 2 as shown in Figure 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 be over maximum rating depending on operating condition. Pd=900mW (Ta=25°C) 5. 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 TEST CIRCUIT Vcc 100 µF 2 9 Ripple Rejection Input 1 27kΩ 470 µF 10kΩ 90Ω 3 UTC RL 4 100 µF Negative Feedback Output 7 Phase 5 6 Pre Power GND GND UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R107-009,A