UTC UTCTA7368P Datasheet

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

Input

1

Rejection

Output

7

R

L

643

Power

GND

Negative

Feedback

Phase

5

Pre

GND

UTC UNISONIC TECHNOLOGIES CO., LTD. 1

QW-R107-009,A

UTC TA7368P LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUN RATINGS (Ta=25°C)

PARAMETER SYMBOL VALUE UNIT

Supply Voltage VCC 14 V
Power Dissipation PD 900 mW
Operating Temperature TOPR -20 ~ 75 °C
Storage Temperature TSTG -55 ~ 150 °C

Note: Derated Ta>25°C, in the proportion of 7.2mW/°C

ELECTRONIC CHARACTERISTICS(Ta=25°C, Vcc=6V, f=1kHz, Rg=600Ω,RL=4Ω, unless otherwise

specified)

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Quiescent Circuit VCC=3V,Vin=0 5.5
Current ICCQ VCC=6V,Vin=0 6.6 mA

VCC=9V,Vin=0 7.5

Voltage Gain GV Vin=0.5mVrms 37 40 43 dB

VCC=3V,RL=4Ω,THD=10% 120
VCC=6V,RL=4Ω,THD=10% 500 720

Output Power Pout VCC=6V,RL=8Ω,THD=10% 300 450 mW

VCC=9V,RL=8Ω,THD=10% 800 1100

VCC=9V,RL=16Ω,THD=10% 450 610
Total Harmonic
Distortion
Output Noise Voltage Vno Rg=10kΩ,BPF=20Hz~20kHz 0.2 0.5 mVrms
Ripple Rejection RR fr=100Hz,Vr=0.3Vrms,Crip=0 25 dB
Input Resistance Rin 27 kΩ

THD Pout=100mW 0.3 1 %

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