TA8205AHQ Toshiba, TA8205AHQ Datasheet - Page 3

• Manufacturer Part Number: TA8205AHQ
• Manufacturer: Toshiba

Specifications of TA8205AHQ

• No. Of Channels: 2
• Package: HZIP 17-P-2.00
• Recommended Vcc (v): 13.2
• Rl=2 Ohm: -
• Rl=4 Ohm: 15W x 2
• Rl=8 Ohm: -
• Features/built-in Functions: 2 BTL channels, low heat resistance, various protection circuits, standby switch
• Operating Voltage (v): 9 to 18

2. Stand−by SW function
The total closed loop gain G
Amp 1 is G
The closed loop voltage gain of power Amp, Amp 3
and Amp 4 is fixed at G
Therefore, the total closed circuit voltage gain G
obtained through BTL connection by the expression
below.
For example, when Rf = 0Ω, GV is obtained by the
expressions (1) and (2) as shown below.
The voltage gain is reduced when R
With the voltage gain reduced, since (1) the oscillation
stability is reduced, and (2) the pop noise changes when
V
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.
Pin(4) control voltage : V
Advantage of stand−by SW
(1) Since V
(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory for
CC
Stand − by
is set to on, refer to the items 3 and 4.
switching.
On
Off
G
G
G
V
V
V1
V1
= G
≒ 24 + 20 + 6 = 50dB
CC
=
.
20
V1
can directly be controlled to on / off by the microcomuter, the switching relay can be omitted.
λ
og
+ G
Power
R1
Off
On
V3
+
f R
V3
(R
+ 6 (dB) ............... (2)
+
(SB)
f
R2
+
≒ G
V
R2)
of this IC can be obtained by expression below when the closed loop voltage gain of
(dB)
V4
V
3~V
(SB)
= 20dB.
0~2
f
is increased. (Fig.2)
CC
(V)
..... (1)
V
is
3
Fig.3 With pin(4) set to high, power is turened on.
Fig.2
TA8205AHQ/ALQ
2004-09-28