TA8252HQ TOSHIBA Semiconductor CORPORATION, TA8252HQ Datasheet - Page 3

• Manufacturer Part Number: TA8252HQ
• Description: Max Power 37w Btl ? 4ch Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Caution And Application Method
(description is made only on the single channel.)
1. Voltage gain adjustment
2. Stand−by SW function (pin(2))
This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can't adjusted, but it makes the
device a space and total costs saver.
Therefore, the total voltage gain is decided by expression below.
By means of controlling pin(2) (stand−by terminal) to high
and low, the power supply can be set to on and off.
The threshold voltage of pin(2) is set at about 3V
and the power supply current is about 2µA (typ.) at the
stand−by state.
Control voltage of pin(2): 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
The voltage gain of amp.1: G
The voltage gain of amp.2A, B: G
The voltage gain of BTL connection: G
Stand−by
switching
On
Off
G
V
CC
= G
can directly be controlled to on or off by the microcomputer, the switching relay can be omitted.
V1
+ G
Power
Off
On
V2
+ G
(SB)
V (BTL)
V1
V
0~1.5
(SB)
3~6
= 0dB
Input
= 0 + 20 + 6 = 26 dB
V2
(V)
= 20dB
V (BTL)
Amp. 1
(Fig.1) Block diagram
+
−
BE
= 6dB
(typ.),
3
Amp. 2A
+
−
Amp. 2B
+
−
OFF
ON
(Fig.2) With pin(2) set to High,
Power
Power is turned ON
2
10kΩ
V
CC
≈2V
BE
to Bias
cutting circuit
TA8252HQ
2006-04-28