Broadcom
- 1 -
Introduction
This evaluation driver board is optimized for a Fuji M652 6-in-1
Integrated Gate Bipolar Transistor (IGBT) module rated at 650V,
600A. It features 6 x ACPL-32JT for IGBT gate driving and 1 x
ACPL-C87AT for bus voltage sensing.
Figure 1 Evaluation Driver Board for Fuji M652 IGBT
Key Features
Gate Driver
The ACPL-32JT is an Automotive 2.5 Amp Gate Drive
Optocoupler. It features an integrated flyback controller for
isolated DC-DC converter, IGBT desaturation sensing, and
protection with soft-shutdown.
Fault Detection and Protection
The power stage of a typical three-phase inverter is susceptible
to destructive failures due to overcurrent and overvoltage
conditions.
An ACPL-32JT monitors each IGBT for short circuit events by
way of the collector voltage and triggers a local fault shutdown
sequence when required. A small gate discharge device slowly
reduces the short circuit collector current to prevent
overvoltage damage. The IGBT is shut off before the dissipated
energy can reach destructive levels.
Integrated Flyback Controller
Each ACPL-32JT has an integrated DC-DC flyback controller
that is paired with a flyback transformer to provide a split rail
Vcc2 voltage of +15V/–5V with up to 2W of isolated power for
driving each IGBT. This distributed power supply architecture
removes the need for a separate monolithic power supply.
Bus Voltage Sensing
The ACPL-C87AT is an automotive unity-gain isolated voltage
sensor that utilizes superior optical coupling technology, with a
sigma-delta analog-to-digital converter, chopper stabilized
amplifiers, and a fully differential circuit topology to provide
unequaled isolation-mode noise rejection, low offset, high gain
accuracy, and stability.
An ACPL-C87AT is used with a resistor chain for bus voltage
sensing.
ACPL-32JT, ACPL-C87AT
Evaluation Driver Board for Fuji M652 6-in-1 IGBT
User Guide
