Datasheet

Technical Note
17/31
BD5446EFV
www.rohm.com
2011.06 - Rev.C
© 2011 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.
①After the MUTEX pin is made Low once, the MUTEX pin is returned to High again.
②Turning on the power supply again.