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TB2959HQ Datasheet(PDF) 6 Page - Toshiba Semiconductor

Part No. TB2959HQ
Description  Maximum Power 47W BTL 4-ch Audio Power IC
Download  24 Pages
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Maker  TOSHIBA [Toshiba Semiconductor]
Homepage  http://www.semicon.toshiba.co.jp/eng
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TB2959HQ Datasheet(HTML) 6 Page - Toshiba Semiconductor

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TB2959HQ
2011-11-08
6
7. 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 VBE (typ.). The power supply
current is about 0.01
A (typ.) in the standby
state.
Stand-by
Power
VSB (V)
ON
OFF
0 to 0.9
OFF
ON
2.2 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.
Table1 Standby Control Voltage (VSB)
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
Figure1 Setting Pin 4 High Turns on
Power
ON
4
OFF
10 k
to Bias
Power
20 k
3 k
60 k


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