Datasheet

©2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD8318 Rev. 1.1.2 2
FOD8318 — 2.5 A Output Current, IGBT Drive Optocoupler with Active Miller Clamp, Desaturation Detection, and Isolated Fault Sensing
Truth Table
*V
OUT
is always LOW with ‘clamp’ being active (gate voltage < 2 V above V
SS
).
Pin Definitions
V
IN+
V
IN–
UVLO
(V
DD2
– V
E
)
DESAT
Detected? FAULT
V
OUT
*
XXActiveXXLOW
XXXYesLOWLOW
LOWXXXXLOW
X HIGH X X X LOW
HIGH LOW Not Active No HIGH HIGH
Pin # Name Description
1V
IN+
Non-inverting gate drive control input
2V
IN–
Inverting gate drive control input
3V
DD1
Positive input supply voltage (3 V to 5.5 V)
4 GND1 Input ground
5 RESET
Fault reset input
6FAULT
Fault output
7V
LED1+
LED 1 anode (must be left unconnected)
8V
LED1-
LED 1 cathode (must be connected to ground)
9V
SS
Output supply voltage (negative)
10 V
CLAMP
Active Miller clamp supply voltage
11 V
O
Gate drive output voltage
12 V
S
Source of pull-up PMOS transistor
13 V
DD2
Positive output supply voltage
14 DESAT Desaturation voltage input
15 V
LED2+
LED 2 anode (must be left unconnected)
16 V
E
Output supply voltage / IGBT emitter
1
2
3
4
5
6
7
8
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
CLAMP
V
SS
16
15
14
13
12
11
10
9