參數(shù)資料
型號： TB2946HQ
元件分類： 音頻／視頻放大
英文描述： 26 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM25
封裝： 1 MM PITCH, PLASTIC, HZIP-25
文件頁數(shù)： 12/18頁
文件大?。?/td> 484K
代理商： TB2946HQ
TB2946HQ
2009-01-29
3
Detailed Description
1. Standby Switch (pin 4)
The power supply can be turned on or off via
pin 4 (Stby). The threshold voltage of pin 4 is
set at about 3 VBE (typ.). The power supply
current is about 0.01
μA (typ.) in the standby
state.
Standby Control Voltage (VSB): Pin 4
Standby
Power
VSB (V)
ON
OFF
0 to 0.9
OFF
ON
2.9 to VCC
Check the pop levels when the time constant of
pin 4 is changed.
Benefits of the Standby Switch
(1)
VCC can be directly turned on or off by a microcontroller, eliminating the need for a switching relay.
(2)
Since the control current is minuscule, a low-current-rated switching relay can be used.
Figure 2 Standby Switch
VCC
Low-current-rated switch
Battery
Standby
VCC
From microcontroller
Battery
Standby
– Using the Standby Switch –
– Conventional Method –
VCC
High-current-rated switch
Battery
VCC
From
microcontroller
Battery
Relay
Figure 1 Setting Pin 4 High Turns on
Power
ON
4
OFF
10 k
Ω
to Bias
filter network
≈ 2 VBE
VCC
Power
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