Technical Note
16/30
BD5446EFV
www.rohm.com
2010.05 - Rev.B
© 2010 ROHM Co., Ltd. All rights reserved.
●
About the protection function
Protection function
Detecting & Releasing condition
DAC
Output
PWM
Output
ERROR
Output
Output short
protection
Detecting
condition
Detecting current = 10A (TYP.)
Normal
operation
HiZ_Low
(Latch)
L
(Latch)
DC voltage protection
in the speaker
Detecting
condition
PWM output Duty=0% or 100%
43msec(fs=48kHz) above fixed
HiZ_Low
(Latch)
L
(Latch)
High temperature
protection
Detecting
condition
Chip temperature to be above 150
℃
(TYP.)
Normal
operation
HiZ_Low
H
Releasing
condition
Chip temperature to be below 120
℃
(TYP.)
Normal
operation
Under voltage
protection
Detecting
condition
Power supply voltage to be below 8V (TYP.)
Normal
operation
HiZ_Low
H
Releasing
condition
Power supply voltage to be above 9V (TYP.)
Normal
operation
Clock stop protection
Detecting
condition
No change to SYS_CLK more than 1usec (TYP.)
Irregular
output
HiZ_Low
H
Releasing
condition
Normal input to SYS_CLK
Normal
operation
Normal
operation
*
The ERROR pin is Nch open-drain output.
*
Once an IC is latched, the circuit is not released automatically even after an abnormal status is removed.
The following procedures
①
or
②
is available for recovery.
①
After the MUTEX pin is made Low once, the MUTEX pin is returned to High again.
②
Turning on the power supply again.
www.DataSheet4U.com
