Friday, March 8, 2013


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

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