HCPL-316 ETC, HCPL-316 Datasheet - Page 21

• Manufacturer Part Number: HCPL-316
• Description: 2.0 Amp Gate Drive Optocoupler with Integrated (VCE) Desaturation Detection and Fault Status Feedback
• Manufacturer: ETC

Figure 62. Recommended Application Circuit.
Description of Operation/
Timing
Figure 63 below illustrates input
and output waveforms under the
conditions of normal operation, a
desat fault condition, and normal
reset behavior.
Normal Operation
During normal operation, V
the HCPL-316J is controlled by
either V
collector-to-emitter voltage being
monitored through D
NON-INVERTING
Figure 63. Timing Diagram.
CONFIGURED
CONFIGURED
330 pF
µC
INVERTING
INPUTS
INPUTS
IN+
5 V
3.3
k
+
–
or V
V
V
V
V
V
V
FAULT
RESET
0.1
µF
IN-
IN+
IN-
IN+
DESAT
OUT
IN-
, with the IGBT
OPERATION
NORMAL
0 V
5 V
5 V
5 V
DESAT
1
2
3
4
5
6
7
8
V
V
V
GND1
RESET
FAULT
V
V
IN+
IN-
CC1
LED1+
LED1-
. The
OUT
of
HCPL-316J
FAULT output is high and the
RESET input should be held high.
See Figure 63.
Fault Condition
When the voltage on the DESAT
pin exceeds 7 V while the IGBT is
on, V
order to “softly” turn-off the IGBT
and prevent large di/dt induced
voltages. Also activated is an
internal feedback channel which
brings the FAULT output low for
OUT
7 V
CONDITION
V
FAULT
DESAT
LED2+
V
V
is slowly brought low in
OUT
CC2
V
V
V
V
EE
EE
C
E
16
15
14
13
12
11
10
9
0.1
µF
k
47
0.1
µF
RESET
100 pF
0.1
µF
100
+
–
+
–
V
V
21
the purpose of notifying the
micro-controller of the fault
condition. See Figure 63.
Reset
The FAULT output remains low
until RESET is brought low. See
Figure 63. While asserting the
RESET pin (LOW), the input pins
must be asserted for an output
low state (V
HIGH). This may be
accomplished either by software
control (i.e. of the
microcontroller) or hardware
control (see Figures 73 and 74).
CC2
D
EE
+
DESAT
V
= -5 V
= 18 V
F
R
–
g
IN+
Q1
Q2
is LOW or V
IN-
is
+
–
+
–
V
V
3-PHASE
OUTPUT
CE
CE