HCPL-3160 Datasheet, PDF (2/4 Pages) Agilent(Hewlett-Packard) – 2.0 Amp IGBT Gate Drive Optocoupler with Integrated Over-current Protection and Fault Feedback

Fault Circuit Operation
A typical desaturation protected
IGBT gate drive application
circuit using the HCPL-3160 is
shown in Figure 1. The IGBT
collector to emitter voltage
is monitored through D_DESAT.
When the IGPT is on and V_DESAT
exceeds the internal reference
voltage of 7 V the IGBT gate is
“softly” turned-off by M2 to
prevent large di/dt generation.
The LED2 driver is also activated,
which drives the internal
feedback LED2 and notifies the
controller of the IGBT fault by
bringing the FAULT output low.
The FAULT output remains
low until RESET is brought low.
(Note if a separate reset line
is not required, RESET can be
connected to Vin on the circuit
board. In this case, the FAULT
output will be reset on the next
PWM cycle that Vin goes low.)
The FAULT output is an open
collector which allows the FAULT
outputs from all the HCPL-3160s
in a drive to be connected
together in a “wired OR” forming
a single fault bus for interfacing
with the micro-controller. The
ENABLE input can also be
connected to this fault bus. With
this connection all IGBTs in a
drive are shutdown without
micro-controller intervention
once a fault is detected on a
single IGBT.
C_BLANK disables the fault
detection circuitry for a time
period sufficient for normal IGBT
turn-on. C_BLANK is held low by
Q1 when the IGBT is off.
GND
LED1–
LED1+
V_CC1
ENABLE
V_IN
RESET
FAULT
GND
HCPL-3160
DETECTOR IC
C_BLANK
V_E
D_DESAT
BUFFER IC
D
LED1
R
I
V
E
R
QR
QS
V_CC1
LED2
SHIELD V_E
SHIELD
A3
UVLO
+
–
+
–
V_UVLO
12 V/11 V
I_CHG
TRIPLE
DARLINGTON
V_E
RQ
I_DSCHG
+
–
SQ
Q1
–
+
DESAT
7V
M2
1X
V_E
R₂
(OPTIONAL)
0.1 µF
+
–
V_CC2
R_G
V_E
M1
33X
+
–
V_EE
LED2
DRIVER
V_E
Figure 1. IGBT Gate Drive with Desaturation Protection and Fault Feedback.
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