tb2959hq TOSHIBA Semiconductor CORPORATION, tb2959hq Datasheet - Page 6

• Manufacturer Part Number: tb2959hq
• Description: Maximum Power 47w Btl  4-ch Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

7.
Standby Switch
Benefits of the Standby Switch
Table1 Standby Control Voltage (V
pin 4 (Stby). The threshold voltage of pin 4 is
set at about 3 V
current is about 0.01 A (typ.) in the standby
state.
Check the pop levels when the time constant of
pin 4 is changed.
(1)
(2)
The power supply can be turned on or off via
Stand-by
OFF
ON
V
Since the control current is minuscule, a low-current-rated switching relay can be used.
CC
can be directly turned on or off by a microcontroller, eliminating the need for a switching relay.
Standby
V
CC
Power
BE
OFF
Low-current-rated switch
ON
High-current-rated switch
V
(typ.). The power supply
CC
Battery
2.2 to V
Figure 2 Standby Switch
V
0 to 0.9
– Using the Standby Switch –
SB
Battery
– Conventional Method –
(V)
CC
SB
)
From microcontroller
6
V
CC
Standby
OFF
ON
Figure1 Setting Pin 4 High Turns on
Power
V
Relay
CC
4
Power
60 k
10 k
From
microcontroller
20 k
Battery
Battery
3 k
to Bias
TB2959HQ
2011-11-08