TA8248K Datasheet | Toshiba

Features - High Power : Pout (1) = 2.5 W (typ.) (VCC = 9 V, RL = 4Ω, f = 1 k Hz, THD = 10%) : Pout (2) = 4.6 W (typ.) (VCC = 12 V, RL = 4Ω, f = 1 k Hz, THD = 10%) - - - - - - Low Popping Noise at Power ON Small Quiescent Current : ICCQ = 21 m A (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.) 2002-04-05 Block Diagram 2002-04-05 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 = 56.5d B (typ.) Gv = 45d B (typ.) Figure 1 By increasing Rf, reduction of Gv is possible. However, since the feedback increase is liable to produce oscillation, it is remended to use this at 40d B 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 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. 3. Input stage The input circuit of this IC is as shown in Fig.2. PNP Tr : Q1 is provided in the input circuit so as to make its usage possible without the input coupling capacitor. However, at pin11 and 12, max 60 m V offset voltage is produced. Application after checking volume slide noise is remended. For cutting the volume slide noise, insert the input capacitor : CIN in series to interrupt the DC ponent. Figure 2 2002-04-05 4. Oscillation preventive measures For oscillation preventive capacitor C6 and C7 between the output terminal and GND, it is remended to use polyester film capacitor having good characteristics for temperature and for high frequency. Since the...