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TA8233BHQ Datasheet(PDF) 3 Page - Toshiba Semiconductor |
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TA8233BHQ Datasheet(HTML) 3 Page - Toshiba Semiconductor |
3 / 16 page TA8233BHQ 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 amp 1 is GV1. (1) (dB) R2 f R R2) f (R R1 og 20 V1 G L L L l + + + = The closed loop voltage gain of power amp, amp 3 and amp 4 is fixed at GV3≒GV4 = 20dB. Therefore, the total closed circuit voltage gain GV is obtained through BTL connection by the expression as below. GV = GV1 + GV3 + 6 (dB)………(2) For example, when Rf = 0Ω, GV is obtained by the expressions (1) and (2) as 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 supply can be set to on and off. The threshold voltage of pin(4) is set at 2.1V (3VBE), and the power supply current is about 1µA (typ.) at the stand−by state. Control voltage of pin(4): V (SB) Stand −By Power V (SB) (V) On Off 0~2 Off On 3~VCC 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 |
Similar Part No. - TA8233BHQ_06 |
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Similar Description - TA8233BHQ_06 |
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