High Voltage, Isolated IGBT Gate Driver
with Isolated Flyback Controller
ADuM4138
Data Sheet
and low voltage domains of the chip. Information on the status
of the chip can be read back from the dedicated outputs.
FEATURES
6 A (typical) peak drive output capability
Internal turn off NFET, on resistance: <1 Ω
Internal turn on PFET, on resistance: <1.2 Ω
2 overcurrent protection methods
Desaturation detection
Split emitter overcurrent detection
Miller clamp output with gate sense input
Isolated fault output
The ADuM4138 includes an isolated flyback controller,
allowing simple secondary voltage generation.
Overcurrent detection is integrated in the ADuM4138 to
protect the IGBT in case of desaturation and/or overcurrent
events. The overcurrent detection is coupled with a high speed,
two-level turn off function in case of faults.
The ADuM4138 provides a Miller clamp control signal for a
metal-oxide semiconductor field effect transistor (MOSFET) to
provide IGBT turn off, with a single rail supply when the Miller
clamp voltage threshold drops below 2 V (typical) above GND2.
Operation with unipolar secondary supplies is possible with or
Isolated temperature sensor readback
Propagation delay
Rising: 95 ns typical
Falling: 100 ns typical
Minimum pulse width: 74 ns
without the Miller clamp operation.
Operating junction temperature range: −40°C to +150°C
V
DD1 and VDD2 UVLO
A low gate voltage detection circuit can trigger a fault if the gate
voltage does not rise above the internal threshold within the
time allowed after turn on (12.8 µs typical). The low voltage
detection circuit detects IGBT device failures that exhibit gate
shorts or other causes of weak drive.
Minimum external tracking (creepage): 8.3 mm (pending)
Safety and regulatory approvals
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
Two temperature sensor pins, TS1 and TS2, allow isolated
monitoring of system temperatures at the IGBTs. The secondary
undervoltage lockout (UVLO) is set to 11.2 V (typical) in
accordance with common IGBT threshold levels.
V
IORM = 849 VPEAK (reinforced/basic)
Qualified for automotive applications
APPLICATIONS
MOSFET and IGBT gate drivers
Photovoltaic (PV) inverters
Motor drives
A serial peripheral interface (SPI) bus on the primary side of
the device provides in field programming of temperature
sensing diode gains and offsets to the ADuM4138. Values are
stored on an electrically erasable programmable read-only
memory (EEPROM) located on the secondary side of the device.
In addition, programming is available for specific VDD2 voltages,
temperature sensing reporting frequencies, and overcurrent
blanking times.
Power supplies
GENERAL DESCRIPTION
The ADuM4138 is a single-channel gate driver optimized for
driving insulated gate bipolar transistors (IGBTs). Analog
Devices, Inc., iCoupler® technology provides isolation between
the input signal and the output gate drive.
The ADuM4138 provides isolated fault reporting for overcurrent
events, remote temperature overheating events, UVLO, thermal
shutdown (TSD), and desaturation detection.
The Analog Devices chip scale transformers also provide isolated
communication of control information between the high voltage
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending.
Rev. A
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