IGD515EI
Data Sheet & Application Manual
IGBT-Driver.com Page 9
Layout of the terminals
The terminal pins of the drive modules in
the IGD515EI series are configured so
that the layout can be kept simple. A
spacing of 45 mm is maintained between
the supply pins and the power potential!
Note
In the following, the abbreviation "FOL"
will be used for the term "fiber-optic
link". This refers to a component of a FOL
connection, such as a fiber-optic
transmitter, a fiber-optic receiver or the
entire FOL connection consisting of the
fiber-optic transmitter, fiber-optic wire
and fiber-optic receiver.
Pins 1,2,3,4,9 and 10
GND and Vcc
These pins are used for the power supply
of the driver module. The nominal feed
voltage is between 12V and 15V. To
ensure reliable starting of the integrated
DC/DC converter, a low-inductance
electrolytic capacitor with high ripple
current must be placed in the immediate
vicinity of pins 9 and 10. The capacitance
of this capacitor must not be less than
that of the capacitor connected to Cs (Pin
23). The current consumption of the
DC/DC converter is determined by the
number of driven transistors, their gate
capacitance and by the clock frequency.
Thanks to the high isolation of the feed
terminals with respect to all other pins,
the drivers of the IGD515EI series can be
supplied by a potential of any size.
The internal turn-on thresholds are
designed so that 12V operation is also
possible. This is particularly useful for
operating transistors that have very high
short-circuit currents at higher gate
voltages (low saturation types).
It should be noted that the drivers
themselves are not protected against
overload. A short circuit between the
gate and the emitter terminal, caused by
a defective power semiconductor, for
example, can lead to thermal destruction
of the driver.
Pin 25 - Output Gate
Pin 25 is the driver output for driving the
gate. Driving is from ±12V to ±15V,
depending on the supply voltage, but also
without a negative gate voltage
depending on the application and the
power transistors used (see description of
pin 24, COM).
The output stages of the drivers of the
IGD515EI series are very ruggedly
dimensioned. The maximum permissible
gate charging current is ±15A; this allows
the largest IGBT and power MOSFET
modules to be driven. A number of power
modules connected in parallel can also be
driven directly. The charging current
must be limited by an external gate
resistor. It should be noted that when the
gate is driven with a ± voltage, the total
voltage rise must be considered.
The gate of the power transistor must be
connected to pin 25 by means of a lead
of minimum length. A gate circuit with
two gate resistors and a diode can be
used to set the switching speeds at turn-
on and at turn-off independently of each
other (see Fig. 3).