TA8220HQ Toshiba, TA8220HQ Datasheet - Page 3

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TA8220HQ

Manufacturer Part Number
TA8220HQ
Description
Manufacturer
Toshiba
Datasheet

Specifications of TA8220HQ

No. Of Channels
2
Package
HZIP 17-P-2.00
Recommended Vcc (v)
13.2
Rl=2 Ohm
26W x 2
Rl=4 Ohm
19W x 2
Rl=8 Ohm
-
Features/built-in Functions
2 BTL channels, standby switch, clipping/shorting detector
Operating Voltage (v)
9 to 18
2. Stand−by SW function
The total closed loop gain G
amp1 is G
The closed loop voltage gain of power amp, amp3 and amp4 is fixed at G
Therefore, the total closed circuit voltage gain G
For example, when R
expressions (1) and (2) as shown below.
The voltage gain is reduced when R
(Fig.2)
With the voltage gain reduced, since (1) the
oscillation stability is reduced, and (2) the pop noise
changes when V
and 4.
By means of controlling (4)pin (stand−by terminal) to
high and low, the power supply can be set to on and off.
The threshold voltage of (4)pin is set at 2.1V (3V
the power supply current is about 1µA (typ.) at the
stand−by state.
Control voltage of (4)pin: V
<Adjustage of stand−by SW>
(1) Since V
(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory for
Stand − By
switching.
G
G
G
V
V
V1
On
Off
≒24 + 20 + 6 = 50dB
= G
=
20
V1
V1
CC
l
.
og
+ G
can directly be controlled to on / off by the microcomputer, the switching relay can be omitted.
R
CC
1
V3
+
f R
Power
(R
is set to on, refer to the items 3
+ 6 (dB)………(2)
Off
On
+
f
f
R
= 0Ω, G
+
2
R
) 2
V
(SB)
(dB)
of this IC can be obtained by expression below when the closed loop voltage gain of
V
V
is obtained by the
L
3~V
(SB)
0~2
L
f
L
CC
is increased.
(V)
(1)
V
BE
is obtained through BTL connection by the expression below.
), and
3
V3
≒G
V4
= 20dB.
TA8220HQ
2004-09-28

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