lv49152v Sanyo Semiconductor Corporation, lv49152v Datasheet - Page 15

• Manufacturer Part Number: lv49152v
• Description: Bi-cmos Lsi Class-d Audio Power Amplifier Btl 15w ? 2ch
• Manufacturer: Sanyo Semiconductor Corporation

Power supply lowering protection circuit
Since the instable operation in the low voltage is prevented by using this circuit, after the voltage of the PVD pin is
monitored and the voltage below the Attack voltage (PVD = 8V typ.), AMP is turned off.
Also, to prevent the instable operation when the voltage of the PVD pin is decreased by any cause during operations, the
Attack voltage (PVD = 7V typ.) is set.
The voltage of Attack and Recover has hysteresis (About 1V) to prevent ON/OFF continuous action of the power supply
lowering protection circuit.
Also, this IC is designed to turn off AMP in the same sequence that the MUTE is on as a pop noise measures when the
plug of products are put off.
Over current protection circuit
The over current protection circuit is a protection circuit * to protect the output DMOS from the over current and
corresponds to any mode of the power supply, GND and a load short.
The protection operation is performed when the current reaches the detection current value set out in IC and the output
DMOS is compulsorily turned off for about 20µsec.
After compulsorily tuning off the output DMOS, when the Amplifier is automatically reset in usual operation and the over
current flows continuously, the protection operation is performed again.
* The over current protection circuit is a function to avoid the abnormal state like the output short-circuit temporarily.
Unfortunately, we cannot guarantee that IC is not destroyed.
Protection
OUTPUT current
Internal signal
operation Normal operation
Internal signal
AMP. OFF
Attack voltage
Function image
Function image
LV49152V
AMP. ON
VD terminal voltage
Recover voltage
AMP. OFF
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