TA8254BHQ Datasheet | Toshiba

tures - High power : POUT (1) = 45 W (typ.) /channel (VCC = 14.4 V, f = 1 k Hz, THD = 10%, RL = 2 Ω) : POUT (2) = 35 W (typ.) /channel (VCC = 13.2 V, f = 1 k Hz, THD = 10%, RL = 2 Ω) : POUT (3) = 21 W (typ.) /channel (VCC = 13.2 V, f = 1 k Hz, THD = 10%, RL = 4 Ω) Low distortion ratio : THD = 0.02% (typ.) (VCC = 13.2 V, f = 1 k Hz, POUT = 10 W, RL = 4 Ω) Low noise : VNO = 0.10 m Vrms (typ.) (VCC = 13.2 V, RL = 4 Ω, Rg = 0 Ω , BW = 20 Hz to 20 k Hz) Built-in stand-by function : (with pin set at LOW, power is turned OFF) ISB = 1 µA (typ.) Built-in output clipping detection and diagnosis circuit : (open collector (active LOW)) Built-in various protection circuits : Thermal shut down, over voltage, OUT → VCC short, OUT → GND short and OUT-OUT short. Operating supply voltage: VCC (opr) = 9 to 18 V Weight: 4.0 g (typ.) - - - - - - 2004-09-28 Block Diagram VCC C5 7 Clip-det and diagnosis 8 VCC2 9 VCC1 OUT1 (+) C1 2 IN1 RL OUT1 (- ) 14 15 C3 RL OUT2 (- ) 11 GND1 13 TAB 5 Ripple C2 GND2 12 OUT2 (+) C1 4 Pre-GND 3 Stand-by SW 6 MUTE 1 R1 C4 2004-09-28 Caution and Application Method (description is made only on the single channel) 1. Voltage Gain Adjustment This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can’t adjusted, but it makes the device a space and total costs saver. Amp. 2A Amp. 1 Input Amp. 2B Figure 1 Block Diagram The voltage gain of Amp. 1: GV1 = 0d B The voltage gain of Amp. 2A, B: GV2 = 20d B The voltage gain of BLT Connection: GV (BTL) = 6d B Therefore, the total voltage gain is decided by expression below. GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26d B 2004-09-28 2. Stand-by SW Function (pin 6) By means of controlling pin 6 (stand-by terminal) to High and Low, the power supply can be set to ON and OFF. The threshold voltage of pin 6 is set at about 3 VBE (typ.), and the Power Supply current is about 1 µA (typ.) at the stand-by state. VCC ON Power OFF 4 10 kΩ ≈ 2 VBE to BIAS cutting...