Datasheet
V
IN+
V
IN-
V
CC1
GND1
RESET
FAULT
µC
ISO5500
1
2
3
6
5
4
8
7
NC
GND1
to other
RESETs
to other
FAULTs
V
IN+
V
IN-
V
CC1
GND1
RESET
FAULT
µC
ISO5500
1
2
3
6
5
R
F
4
8
7
NC
GND1
V
IN+
V
IN-
V
CC1
GND1
RESET
FAULT
µC
ISO5500
1
2
3
6
5
R
F
4
8
7
NC
GND1
ISO5500
SLLSE64C –SEPTEMBER 2011–REVISED JUNE 2013
www.ti.com
LOCAL SHUTDOWN AND RESET
In applications with local shutdown and reset, the FAULT output of each gate driver is polled separately, and the
individual reset lines are asserted low independently to reset the motor controller after a fault condition.
Figure 64. Local Shutdown and Reset for Non-inverting (left) and Inverting Input Configuration (right)
GLOBAL-SHUTDOWN AND RESET
When configured for inverting operation, the ISO5500 can be configured to shutdown automatically in the event
of a fault condition by tying the FAULT output to V
IN+
. For high reliability drives, the open drain FAULT outputs of
multiple ISO5500 devices can be wired together forming a single, common fault bus for interfacing directly to the
micro-controller. When any of the six gate drivers of a three-phase inverter detects a fault, the active low FAULT
output disables all six gate drivers simultaneously; thereby, providing protection against further catastrophic
failures.
Figure 65. Global Shutdown with Inverting Input Configuration
AUTO-RESET
Connecting RESET to the active control input (V
IN+
for non-inverting, or V
IN–
for inverting operation) configures
the ISO5500 for automatic reset capability. In this case, the gate control signal at V
IN
is also applied to the
RESET input to reset the fault latch every switching cycle. During normal IGBT operation, asserting RESET low
has no effect on the output. For a fault condition, however, the gate driver remains in the latched fault state until
the gate control signal changes to the 'gate low' state and resets the fault latch.
If the gate control signal is a continuous PWM signal, the fault latch will always be reset before V
IN+
goes high
again. This configuration protects the IGBT on a cycle by cycle basis and automatically resets before the next
'on' cycle. When the ISO5500 is configured for Auto Reset, the specified minimum FAULT signal pulse width is
3 μs.
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