TA8221AHQ / ALQ

2006-04-28

3

(dB)

R2

f

R

R2)

f

(R

R1

og

20

V1

G

+

+

+

=

l

..... (1)

The closed loop voltage gain of power amp, amp 3

obtained through BTL connection by the expression

below.

expressions (1) and (2) as shown below.

With the voltage gain reduced, since (1) the oscillation

stability is reduced, and (2) the pop noise changes when

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.

and the power supply current is about 100µA (typ.) at the

stand−by state.

Stand

−by

Power

On

Off

0~2

Off

On

Advantage of stand−by SW

(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory for

switching.