TA8210AHQ Ver la hoja de datos (PDF) - Toshiba

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Fabricante

TA8210AHQ

20W BTL × 2ch Audio Power Amplifier

Toshiba 

TA8210AHQ/ALQ

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.

GV1

=

20 l og

R1+ (Rf + R2)

Rf + R2

(dB)

.....

(1)

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

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.

Fig.2

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.

Pin(4) control voltage : V (SB)

Stand−by

Power

V (SB) (V)

On

Off

0~2

Off

On

3~VCC

Fig.3 With pin(4) set to high, power is on.

Advantage of stand−by SW

(1) Since VCC can directly be controlled to on / 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.

3

2006-04-28

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