IRS2336D International Rectifier Corp., IRS2336D Datasheet - Page 24

• Manufacturer Part Number: IRS2336D
• Description: High Voltage 3 Phase Gate Driver Ic
• Manufacturer: International Rectifier Corp.

Fault Reporting and Programmable Fault Clear Timer
The IRS2336xD family provides an integrated fault reporting output and an adjustable fault clear timer. There are
two situations that would cause the HVIC to report a fault via the FAULT pin. The first is an undervoltage condition
of V
internally pulled to V
condition has been removed and the fault clear timer expires; once the fault clear timer expires, the voltage on the
FAULT pin will return to V
The length of the fault clear time period (t
capacitor where the time constant is set by R
occurred (UVLO or ITRIP), RCIN and FAULT are pulled to V
timer begins. Figure 13 shows that R
between the RCIN and V
The design guidelines for this network are shown in Table 3.
The length of the fault clear time period can be determined by using the formula below.
www.irf.com
CC
Figure 12: RCIN and FAULT pin waveforms
and the second is if the ITRIP pin recognizes a fault. Once the fault condition occurs, the FAULT pin is
V
V
FAULT
RCIN
ITRIP
V
SS
SS
and the fault clear timer is activated. The fault output stays in the low state until the fault
V
SS
CC
t
SS
FLTCLR
pins.
.
Impedanc e S tate
V
RCIN,TH
High
t
RCIN
FLTCLR
V
CC
is connected between the V
Table 3: Design guidelines
C
R
FLTCLR
= -(R
RCIN
RCIN
Time
Time
RCIN
v
and C
C
RCIN
) is determined by exponential charging characteristics of the
(t) = V
C
RCIN
RCIN
24
f
(1-e
)ln(1-V
. In Figure 12 where we see that a fault condition has
SS
0.5 MΩ to 2 MΩ
, and once the fault has been removed, the fault clear
-t/RC
Figure 13: Programming the fault clear timer
>> R
Ceramic
≤1 nF
)
RCIN,TH
ON,RCIN
/V
CC
CC
and the RCIN pin, while C
R
C
RCIN
RCIN
)
HIN (x3)
LIN (x3)
FAULT
ITRIP
RCIN
EN
V
V
IRS2336xD Family
SS
cc
© 2008 International Rectifier
I
DC-
LO (x3)
COM
V
B
(x3)
RCIN
V
HO (x3)
S
(x3)
is placed