Data Sheet
© Semiconductor Components Industries, LLC, 2010 www.onsemi.com
FOD8316 Rev. 2 22
FOD8316 — 2.5 A Output Current, IGBT Drive Optocoupler with Desaturation Detection and Isolated Fault Sensing
Application Information
Figure 52. Recommended Application Circuit
Functional Description
The typical application circuit is shown in Figure 52 and
the functional behavioral of the FOD8316 is illustrated by
the detailed internal schematic shown in Figure 53. This
helps explain the interaction and sequence of internal
and external signals, together with the timing diagrams.
1. Non-Inverting and Inverting Inputs
There are two CMOS/TTL compatible inputs, V
IN+
and
V
IN-
to control the IGBT, in non-inverting and inverting
co
nfigurations respectively. When V
IN-
is set to LOW,
V
IN+
controls the driver output, V
O
, in non-inverting con-
figuration. When V
IN+
is set to HIGH, V
IN-
controls the
driver output in inverting configuration.
The relationship between the inputs and output are
illustrated in the Figure 54.
During normal operation, when no fault is detected, the
FAULT
output, which is an open-drain configuration, will
b
e latched to HIGH state. This allows the gate driver to
be controlled by the input logic signal.
When a fault is detected, the FAULT
output will be
l
atched to LOW state. This condition will remain until the
RESET
pin is also pulled low for a period longer than
PW
R
ESET
. While setting the RESET pin to a low state,
t
he input pins must be pulled to low to ensure an output
state (V
IN+
is low or V
IN-
is HIGH).
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
+
+ –
–
+
–
V
IN+
V
IN–
V
DD1
GND1
RESET
FAULT
V
LED1+
V
LED1-
V
E
V
LED2+
DESAT
V
DD2
V
S
V
O
V
SS
V
SS
FOD8316
Micro
Controller
1 kΩ
330 pF
+
–
0.1 µF
5 V
3-Phase
Output
+
–
+
–
C2
1 µF
C1
1 µF
D1
C3
10 µF
100 pF
100 Ω
V
DD2
= 15 V
D
DESAT
Rg
V
F
V
SS
= –8 V
V
CE
V
CE
Q1
Q2
Figure 53. Detailed Internal Schematic
V
DD2
13
V
S
12
V
O
11
50x
1x
V
SS
9,10
DESAT
+
–
–
+
14
250 µA
12 V
V
E
16
V
IN+
1
15
7
V
DD1
3
V
IN–
2
V
LED1–
V
LED+
V
LED2+
8
GND1
5µs Pulse
Generator
Gate Drive
Optocoupler
Fault Sense
Optocoupler
UVLO Comparator
Delay
Q
R S
4
RESET
5
FAULT
6
V
DESAT