User Guide for
FEBFOD8316 Evaluation Board
2.5 A Output Current, IGBT Drive
Optocoupler with Desaturation Detection
and Isolated Fault Sensing
Featured Fairchild Product/s:
FOD8316
Direct questions or comments
about this evaluation board to:
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© 2013 Fairchild Semiconductor Corporation
FEBFOD8316 Evaluation Board • Rev. 1.0.0
Table of Contents
1.
Overview................................................................................................................................... 3
1.1.
Features and Benefits........................................................................................................ 3
1.2.
Applications ...................................................................................................................... 4
2.
Operations ................................................................................................................................. 5
3.
Circuit Schematic...................................................................................................................... 7
4.
Setup and Operation.................................................................................................................. 9
5.
Test Procedures and Conditions................................................................................................ 9
6.
Scope Shots............................................................................................................................. 11
7.
Conclusion .............................................................................................................................. 13
8.
Revision History ..................................................................................................................... 14
© 2013 Fairchild Semiconductor Corporation
2
FEBFOD8316 Evaluation Board • Rev. 1.0.0
1.
Overview
Fairchild Semiconductor’s FOD8316 smart gate driver optocoupler, an advanced 2.5 A
output current IGBT drive optocoupler, offers the critical protection necessary for
preventing fault conditions that lead to destructive thermal runaway of IGBTs. Pin-for-
pin compatible with current solutions, the FOD8316 consists of an integrated gate drive
optocoupler featuring low R
DS(ON)
CMOS transistors to drive the IGBT from rail-to-rail
and high-speed isolated feedback circuitry for fault sensing. It is ideally suited for driving
fast-switching power IGBTs and MOSFETs.
The FOD8316 offers best-in-class noise immunity, resulting from its proprietary
Optoplanar
®
coplanar packaging technology. The optoplanar technology ensures safe
insulation thickness of more than 0.4 millimeters in attaining reliable high-voltage
isolation, certified by UL1577 and DIN EN/IEC60747-5-5 standards.
Figure 1. 3-Dimensional Illustration of the Internal Die Set of
®
Fairchild’s Optoplanar Package Construction
1.1.
Features and Benefits
2.5 A output current driving capability for most 1200 V / 150 A IGBTs
High noise immunity characterized by CMR: 35 kV/µs at V
cm
= 1500 V
peak
1414 V
peak
working insulation voltage and 8000 V
peak
transient isolation voltage
rating
Output voltage swing rail-to-rail: low power dissipation
Soft IGBT turn-off
High speed: 500 ns propagation delay
3.3 V / 5V, CMOS/TTL-compatible inputs
© 2013 Fairchild Semiconductor Corporation
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FEBFOD8316 Evaluation Board • Rev. 1.0.0
1.2.
Applications
Motor Drives
Industrial Inverters
Solar Power Inverters
Uninterruptible Power Supplies (UPS)
Induction Heating
Isolated IGBT Drive
Figure 2. FOD8316 Block Diagram
© 2013 Fairchild Semiconductor Corporation
4
FEBFOD8316 Evaluation Board • Rev. 1.0.0
2.
Operations
The application circuit and the timing diagram illustrate the functional use of the
FOD8316 between a micro-controller and a three-phase system, as well as the interaction
of the internal and external signals.
Figure 3. Typical Application Circuit
The internal gate driving circuitry of FOD8316 can be used with either a single positive
power supply, V
DD2
, or a dual positive and negative supply, V
DD2
and V
SS
. The output
driver stage, V
O
, is made up of a pair of PMOS and NMOS transistors, which facilitates
close to rail-to-rail output swing. This allows a tight control of gate voltage during on-
state and short-circuit condition. Due to the low R
DS(ON)
of the MOSFETs, the power
dissipation is reduced as compared to bipolar-type driver output stages. The absolute
maximum rating of the output peak current, I
O(PEAK)
, is 3 A.
FOD8316 provides short-circuit protection by means of desaturation-detection circuits
that monitor the collector-emitter voltage of the IGBT. When the DESAT voltage
increases above the threshold voltage, a short-circuit condition is detected and the driver
output stage executes a “soft” IGBT turn-off and is eventually driven low. The soft turn-
off feature ensures the safe turn-off of the IGBT under fault conditions. This reduces the
voltage spike on the collector of the IGBT. Without this, the IGBT would see a heavy
spike on the collector, resulting in a permanent damage to the device when it is turned off
immediately. The FAULT open-drain output is triggered active LOW to report a
desaturation error to the micro-controller. The FAULT signal is cleared by activating the
RESET pin with an active LOW signal communicated by the external controller. The
DESAT fault detector should be disabled for a short period (blanking time) before the
IGBT turns on to allow the collector voltage to fall below the DESAT threshold. This
blanking period protects against false trigger of the DESAT while the IGBT is turning on.
© 2013 Fairchild Semiconductor Corporation
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FEBFOD8316 Evaluation Board • Rev. 1.0.0
Automotive Electronics
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