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TA8215HQ Datasheet(PDF) 3 Page - Toshiba Semiconductor |
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TA8215HQ Datasheet(HTML) 3 Page - Toshiba Semiconductor |
3 / 14 page TA8215HQ/LQ 2006-04-28 3 The total closed loop gain GV of this IC can be obtained by expression below when the closed loop voltage gain of Amp1 is GV1. GV1 = 20ℓog R2 f R R2) f (R R1 + + + (dB) ..... (1) The closed loop voltage gain of power Amp, Amp3 and Amp4 is fixed at GV3 ≒ GV4 = 20dB. Therefore, the total closed loop voltage gain GV is obtained through BTL connection by the expression below. GV = GV1 + GV3 + 6 (dB) ..... (2) For example, when Rf = 0Ω, GV is obtained by the expressions (1) and (2) as shown below. GV ≒ 24 + 20 + 6 = 50dB The voltage gain is reduced when Rf is increased. (Fig.2) With the voltage gain reduced, since (1) the oscillation stability is reduced, and (2) the pop noise changes when VCC is set to on, refer to the items 3 and 4. 2. Stand −by SW function By means of controlling pin (4) (stand −by terminal) to high and low, the power suply can be set to on and off. The threshold voltage of pin (4) is set at about 3V (typ.), and the power supply current is about 1µA (typ.) at the stand −by state. (4) pin control voltage : V (SB) Stand −by Power V (SB) (V) On Off 0~2 Off On 3~VCC ~Advantage of stand −by SW~ (1) Since VCC can directly be controlled to on, off by the microcomuter, the switching relay can be omitted. (2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory for switching. (4) |
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