2
Typical Fault Protected
IGBT Gate Drive Circuit
The HCPL-316J is an easy-to-use,
intelligent gate driver which
makes IGBT V
CE
fault protection
compact, affordable, and easy-to-
implement. Features such as user
configurable inputs, integrated
V
CE
detection, under voltage
lockout (UVLO), “soft” IGBT
turn-off and isolated fault feed-
back provide maximum design
flexibility and circuit protection.
HCPL-316J
1
2
3
µC
R
F
+
–
4
5
6
7
8
V
IN+
V
IN-
V
CC1
GND1
RESET
FAULT
V
LED1+
V
LED1-
V
E
V
LED2+
DESAT
V
CC2
V
C
V
OUT
V
EE
V
EE
16
15
14
13
12
11
10
9
R
PULL-DOWN
–
* THESE COMPONENTS ARE ONLY REQUIRED WHEN NEGATIVE GATE DRIVE IS IMPLEMENTED.
*
C
BLANK
100
Ω
D
DESAT
+
V
F
–
*
+
–
+
R
G
V
CE
–
–
*
+
+
V
CE
Figure 1. Typical Desaturation Protected Gate Drive Circuit, Non-Inverting.
Description of Operation
during Fault Condition
1. DESAT terminal monitors the
IGBT V
CE
voltage through
D
DESAT
.
2. When the voltage on the
DESAT terminal exceeds
7 volts, the IGBT gate voltage
(V
OUT
) is slowly lowered.
3. FAULT output goes low,
notifying the microcontroller
of the fault condition.
4. Microcontroller takes
appropriate action.
be configured as inverting or
non-inverting using the V
IN+
or
V
IN-
inputs respectively. When an
inverting configuration is desired,
V
IN+
must be held high and V
IN-
toggled. When a non-inverting
configuration is desired, V
IN-
must be held low and V
IN+
toggled. Once UVLO is not active
(V
CC2
- V
E
> V
UVLO
), V
OUT
is
allowed to go high, and the
UVLO
(V
CC2
- V
E
)
Active
X
X
X
Not Active
DESAT (pin 14) detection feature
of the HCPL-316J will be the
primary source of IGBT protection.
UVLO is needed to ensure DESAT
is functional. Once V
UVLO+
> 11.6
V, DESAT will remain functional
until V
UVLO-
< 12.4 V. Thus, the
DESAT detection and UVLO
features of the HCPL-316J work in
conjunction to ensure constant
IGBT protection.
Pin 6
(FAULT)
Output
X
Low
X
X
High
V
IN+
X
X
Low
X
High
V
IN-
X
X
X
High
Low
Output Control
The outputs (V
OUT
and FAULT)
of the HCPL-316J are controlled
by the combination of V
IN
, UVLO
and a detected IGBT Desat
condition. As indicated in the
below table, the HCPL-316J can
Desat Condition
Detected on
Pin 14
X
Yes
X
X
No
V
OUT
Low
Low
Low
Low
High
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
