TA8248K

TA8248K TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic 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) Weight: 3.9 g (typ.) 1 2002-04-05 TA8248K Block Diagram 2 2002-04-05 TA8248K 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. Gv = 20 log R f + R1 + R2 R f + R1 When Rf = 0 Ω, When Rf = 120 Ω, Gv = 56.5dB (typ.) Gv = 45dB (typ.) 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. 2. 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 radiat...