lv4900hr Sanyo Semiconductor Corporation, lv4900hr Datasheet - Page 9

• Manufacturer Part Number: lv4900hr
• Description: Class-d Audio Power Amplifier Btl 10w?2ch
• Manufacturer: Sanyo Semiconductor Corporation

Functional Descriptions
System Standby
Mute Function
(1) Output Muting
(2) Power On Sequence
(3) Power Down Sequence
The bias levels are turned on and off under control of the high/low state of the STBY pin. When the STBY pin is low,
the bias levels will be turned off, and when that pin is high, the bias levels will be applied.
The mute function is provided mainly to mute the output so that impulse noise will not appear in the output when the
power supply is being turned on.
The output PWM signal can be turned on or off by setting the MUTE pin high or low. When the MUTE pin is low, the
internal oscillator is stopped. This oscillator operates at all times that the MUTE pin is high.
Applications should provide a power-on muting period of at least 500ms to minimize impulse noise.
Applications should provide a power down muting period of at least 100ms to minimize impulse noise.
Turn-on time: the time between the point the STBY pin is set high and the point the MUTE pin is set high.
Turn-off time: the time between the point the MUTE pin is set low and the point the STBY pin is set low.
5 [V]
5 [V]
5 [V]
5 [V]
0
0
0
0
Internal power
supply
STBY pin
MUTE pin
Output pin
MUTE pin capacitor voltage
Internal power supply
Output pin Amplifier on
STBY pin
MUTE pin
MUTE pin
capacitor voltage
Turn-on time
LV4900HR
Power down time
Amplifier on
5V/DIV.
5V/DIV.
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