ta8251ahq TOSHIBA Semiconductor CORPORATION, ta8251ahq Datasheet - Page 3

• Manufacturer Part Number: ta8251ahq
• Description: Max Power 30w 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
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 (typ.), and
the power supply current is about 100µA (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
microcomputer, the switching relay can be omitted.
switching
On
Off
G
V
= G
CC
V1
can directly be controlled to on or off by the
+ G
Power
V2
Off
On
+ G
V (BTL)
(SB)
V
V1
3~V
(SB)
0~2
= 0 + 28 + 6 = 34dB
= 0dB
CC
V2
(V)
= 28dB
V (BTL)
= 6dB
3
TA8251AHQ
2006-04-28