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TA8215HQ

18W BTL ×2CH Audio Power Amplifier

Toshiba 

TA8215HQ/LQ

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

R1+ (Rf + R2)

Rf + R2

(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

(4)

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.

3

2006-04-28

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