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FOD8318 — 2.5 A Output Current, IGBT Drive Optocoupler with Active Miller Clamp, Desaturation Detection, and Isolated Fault Sensing
December 2012
FOD8318
2.5 A Output Current, IGBT Drive Optocoupler
with Active Miller Clamp, Desaturation Detection, and
Isolated Fault Sensing
Features
High noise immunity characterized by common mode
Description
The FOD8318 is an advanced 2.5 A output current
IGBT drive optocoupler capable of driving most
1200 V / 150 A IGBTs. It is ideally suited for fast-switch-
ing driving of power IGBTs and MOSFETs used in motor
control inverter applications and high-performance
power systems. It consists of an integrated gate drive
optocoupler featuring low R
DS(ON)
CMOS transistors to
drive the IGBT from rail to rail and an integrated high-
speed isolated feedback for fault sensing. The FOD8318
has an active Miller clamp fuction to shut off the IGBT
during a high dv/dt situation without the need of a nega-
tive supply voltage. It offers critical protection features
necessary for preventing fault conditions that lead to
destructive thermal runaway of IGBTs.
It utilizes Fairchild’s proprietary Optoplanar
®
coplanar
packaging technology and optimized IC design to
achieve high noise immunity, characterized by high
common mode rejection and power supply rejection
specifications.
The device is housed in a compact 16-pin small outline
plastic package that meets the 8 mm creepage and
clearance requirements.
rejection
– 35 kV / µs Minimum Common Mode Rejection
(Vcm = 1500 V
peak
)
2.5 A peak output current driving capability for most
1200 V / 150 A IGBT
Optically isolated fault sensing feedback
Active Miller clamp to shut off the IGBT during high
dv/dt without needing a negative supply voltage
“Soft” IGBT turn-off
Built-in IGBT protection
– Desaturation detection
– Under-voltage lock out (UVLO) protection
Wide supply voltage range from 15 V to 30 V
– Use of P-Channel MOSFETs at output stage
enables output voltage swing close to the supply
rail (rail-to-rail output)
3.3 V / 5 V, CMOS/TTL-compatible inputs
High Speed
– 500 ns max. propagation delay over full operating
temperature range
Extended industrial temperate range, -40°C to 100°C
temperature range
Safety and regulatory approvals
– UL1577, 4,243 V
RMS
for 1 min.
– DIN EN/IEC 60747-5-5,1,414 V
peak
working
insulation voltage, 8000 V
peak
transient isolation
voltage ratings
R
DS(ON)
of 1
(typ.) offers lower power dissipation
User configurable: inverting, non-inverting, auto-reset,
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