IRS2336D International Rectifier Corp., IRS2336D Datasheet - Page 25

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

Over-Current Protection
The IRS2336xD HVICs are equipped with an ITRIP input pin. This functionality can be used to detect over-current
events in the DC- bus. Once the HVIC detects an over-current event through the ITRIP pin, the outputs are
shutdown, a fault is reported through the FAULT pin, and RCIN is pulled to V
The level of current at which the over-current protection is initiated is determined by the resistor network (i.e., R
and R
to determine the maximum allowable level of current in the DC- bus and select R
at node V
For example, a typical value for resistor R
exceed 5 V; if necessary, an external voltage clamp may be used.
Over-Temperature Shutdown Protection
The ITRIP input of the IRS2336xD can also be used to detect over-temperature events in the system and initiate a
shutdown of the HVIC (and power switches) at that time. In order to use this functionality, the circuit designer will
need to design the resistor network as shown in Figure 15 and select the maximum allowable temperature.
This network consists of a thermistor and two standard resistors R
resistance of the thermistor will change; this will result in a change of voltage at node V
be selected such the voltage V
the maximum allowable temperature is reached. The voltage of the ITRIP pin should not be allowed to exceed 5 V.
(e.g., DL4148) can be used. This network is shown in Figure 16; the OR-ing diodes have been labeled D
When using both the over-current protection and over-temperature protection with the ITRIP input, OR-ing diodes
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2
) connected to ITRIP as shown in Figure 14, and the ITRIP threshold (V
X
reaches the over-current threshold (V
Figure 14: Programming the over-current protection
X
should reach the threshold voltage (V
0
could be 50 mΩ. The voltage of the ITRIP pin should not be allowed to
V
IT,TH+
R
1
IT,TH+
HIN (x3)
LIN (x3)
FAULT
ITRIP
RCIN
R
EN
V
0
V
V
SS
cc
= R
X
R
2
) at that current level.
0
I
DC-
25
(R
1
/(R
I
DC-
1
+R
2
IT,TH+
))
LO (x3)
COM
3
V
B
(x3)
and R
V
HO (x3)
S
) of the ITRIP functionality by the time that
(x3)
SS
.
4
. As the temperature changes, the
IT,TH+
IRS2336xD Family
0
, R
). The circuit designer will need
1
, and R
X
. The resistor values should
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2
such that the voltage
1
and D
0
, R
2
.
1
,