TA8248K

Low Frequency Power Amplifier

TA8248K is an audio power IC with built-in two channels developed for portable radio cassette tape recorder with power ON/OFF switch. Because of the parts reduction and SIP (Single Inline Package),space merit is remarkable. Thermal shut down protection circuit is built in.

Features :

• High Power

         Pout (1) = 2.5 W (typ.)
         (VCC = 9 V, RL = 4Ω, f = 1 kHz, THD = 10%)
         Pout (2) = 4.6 W (typ.)
         (VCC = 12 V, RL = 4Ω, f = 1 kHz, THD = 10%)

• Low Popping Noise at Power ON
• Small Quiescent Current
  ICCQ = 21 mA (typ.) (VCC = 15 V, Vin = 0)
• Soft Clip
• Built-in Thermal Shut Down Protection Circuit
• Best for Supply Voltage 9 V, 12 V
• Operation Supply Voltage Range : VCC (opr) = 6~15 V (Ta = 25°C)

Blok Diagram

 

Application Information And Application Method

1. Adjustment of voltage gain

The voltage gain Gv is obtained as follows by R1, R2 and Rf in Fig.1.

 Figure 1

By increasing Rf, reduction of Gv is possible. However, since the feedback increase is liable to produce oscillation, it is recommended to use this at 40dB or over.

Thermal shut-down circuit

The thermal shut-down circuit is built in for the purpose of preventing the destruction of IC due to the

abnormal temperature rise when the heat radiation is insufficient. The operation temperature is set at radiation Fin temperature 175°C (typ.). At this temperature or over the bias is interrupted to prevent the destruction of IC.

Download Datasheet TA8428K