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for receiving fault and status signals from
transformers housed in one IC type package. To
avoid saturation, capacitors are placed in series
with each primary winding to which PWM pulse
train is transmitted. 1200 Volts of isolation
barrier is built in. Note the use of high voltage
fast diode with required voltage rating to feed
Vcc to upper driver. Higher current MOSFET/IGBTs require higher drive
currents, especially for operating them at high
switching frequencies. For these applications, one
can use IXD_408 or IXD_414, either in stand-alone
mode or in conjunction with IXBD4410 and
IXBD4411. It is easy to realize now that one can
easily get all the facilities of feature-rich IXBD4410
and IXBD4411 and when higher drive current
capability is called for, use them in conjunction with
IXD_408 or IXD_409 or IXD_414. In case of a lowside MOSFET/IGBT, it is simple to use IXD_408 or
IXD_414 alone. One such example is given in Fig.
For driving upper MOSFET/IGBT of a phase leg, one
of the approaches is to employ a charge pump. Two
such application circuit schematics are shown in Fig.
(7) and Fig. (8). In Fig. (7) output from
IXBD4410/4411 is boosted up to ± 8 Amps using
IXD_408 and the charge pump output is boosted to
350 mA, using one driver of IXD_404 for driving
IXFK48N50 (rated at Id=48 Amps and Vd = 500
Volts). In Fig. (8), the output from IXBD4410/4411 is
boosted up to ±14 Amps by IXD_414 to drive a Size
9 MOSFET IXFN80N50 (rated at Id = 80 Amps and
Vd = 500 Volts). IXD_404 can still adequately
provide 500 mA for the charge pump circuit.
4.2 GENERAL REMARKS ABOUT MOSFET/IGBT
The most important strength of MOSFET/IGBT IC
Drivers should be their ability to provide high
currents needed to adequately drive today’s and
tomorrow’s large size MOSFETs and IGBTs.
Another important feature is that there should be no
cross conduction in the output stage of the driver IC,
thus saving transition power dissipation.
In addition, all these Drivers in...
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This note was uploaded on 01/15/2014 for the course ECE 624 taught by Professor Staff during the Winter '08 term at Ohio State.
- Winter '08