tb2923ahq TOSHIBA Semiconductor CORPORATION, tb2923ahq Datasheet - Page 3

• Manufacturer Part Number: tb2923ahq
• Description: 51 W ? 4-ch Btl Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Detailed Description
1. Standby Switch
Standby Control Voltage (V
Benefits of the Standby Switch
The power supply can be turned on or off via
pin 4 (Stby). The threshold voltage of pin 4 is
set at about 3 V
current is about 0.01 μA (typ.) in the standby
state.
Check the pop levels when the time constant of
pin 4 is changed.
(1)
(2)
Standby
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
BE
Power
OFF
Low-current-rated switch
ON
High-current-rated switch
(typ.). The power supply
(pin 4)
V
CC
Battery
2.9 to VCC
SB
V
0 to 0.9
– Using the Standby Switch –
SB
Battery
): Pin 4
– Conventional Method –
(V)
Figure 2 Standby Switch
From microcontroller
3
V
CC
Standby
OFF
ON
Figure 1 Setting Pin 4 High Turns on
Power
V
Relay
CC
4
Power
10 kΩ
From
microcontroller
Battery
Battery
V
CC
≈ 2 V
BE
to Bias
filter network
TB2923AHQ
2009-01-29