Technical Note
6/17
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2010.06 - Rev.A
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BD7830NUV
●Description of operations
①ON/OFF operation by STBY pin
Once VCC = H, when STBY = L → H then BIAS and output (OUT) are activated.
Once BIAS has become stable (= 1/2 VCC), output (OUT) fades in (FADE IN).
Once STBY = H → L, output (OUT) starts to fade out (FADE OUT), and when fade-out ends, the BIAS falls.
②ON/OFF control by shorting of VCC and STBY pins
When VCC = STBY = L → H, BIAS is activated. During low power mode (VCC < 1.78 V) protection is used to keep output
(OUT) at low level, and FADE IN occurs when this protection is canceled. When VCC = STBY = H → L, output (OUT) falls
without FADE OUT.
Standby
Active Standby
STBY
BIAS
VCC
FADE IN
OUT
FADE OUT
Delay
(internally
Normal input
mode
Audio
Input
STBY
BIAS
VCC
OUT
Delay
(internally fixed)
Under voltage
protection
1.78V (typ)
Audio
Input
