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TA8252H Datasheet(PDF) 3 Page - Toshiba Semiconductor |
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TA8252H Datasheet(HTML) 3 Page - Toshiba Semiconductor |
3 / 14 page TA8252H 2002-10-30 3 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. The voltage gain of amp.1: GV1 = 0dB The voltage gain of amp.2A, B: GV2 = 20dB The voltage gain of BTL connection: GV (BTL) = 6dB Therefore, the total voltage gain is decided by expression below. GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26 dB 2. Stand-by SW function (pin(2)) By means of controlling pin(2) (stand-by terminal) to high and low, the power supply can be set to on and off. The threshold voltage of pin(2) is set at about 3VBE (typ.), and the power supply current is about 2µA (typ.) at the stand-by state. Control voltage of pin(2): V (SB) Stand -by Power V (SB) (V) On Off 0~1.5 Off On 3~6 Adjustage of stand-by SW (1) Since VCC can directly be controlled to on or off by the microcomputer, the switching relay can be omitted. (2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory for switching + − + − + − (Fig.1) Block diagram Amp. 2B Amp. 2A Amp. 1 Input 2 VCC ≈2VBE 10kΩ Power ON OFF (Fig.2) With pin(2) set to High, Power is turned ON to Bias cutting circuit |
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