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IRAUDAMP5 REV 3.1
Over-Current Protection (OCP)
In the IRAUDAMP5, the IRS2092S gate driver accomplishes OCP internally, a feature discussed
in greater detail in the “Protection” section.
Offset Null (DC Offset)
The IRAUDAMP5 is designed such that no output-offset nullification is required, thanks to
closed loop operation. DC offsets are tested to be less than ±20mV.
Protection
The IRAUDAMP5 has a number of protection circuits to safeguard the system and speaker as
shown in the figure 13 below, which fall into one of two categories – internal faults and external
faults, distinguished by the manner in which a fault condition is treated. Internal faults are only
relevant to the particular channel, while external faults affect the whole board. For internal faults,
only the offending channel is stopped. The channel will hiccup until the fault is cleared. For
external faults, the whole board is stopped using the shutdown sequencing described earlier. In
this case, the system will also hiccup until the fault is cleared, at which time it will restart
according to the startup sequencing described earlier.
.
.
D4
OCREF
OCREF
5.1V
CSD
Trip
RESET
OCSET
+
.
UVP
LO
VS
VCC
VB
CSH
R41
OVP
OTP
R25
D1
BAV19
DCP
LP Filter
Green
Yellow
LEDs
R18
HO
To next channel
OCSET
COM
10R
R30
CSD
R43
1.2V
+B
R19
10R
R32
-B
IRF6645
Q4
IRF6645
Q3
Functional Block Diagram of Protection Circuit Implementation
Fig 13
Summary of Contents for IRAUDAMP5
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