IL33153 Datasheet, PDF (12/14 Pages) Integral Corp. – SINGLE IGBT GATE DRIVER

TECHNICAL DATA
APPLICATION INFORMATION
Figure 35 shows a basic IGBT driver application.
When driven from an optoisolator, an input pull up re-
sistor is required. This resistor value should be set to
bias the output transistor at the desired current. A de-
coupling capacitor should be placed close to the IC to
minimize switching noise.
A bootstrap diode may be used for a floating supply.
If the protection features are not required, then both the
Fault Blanking/Desaturation and Current Sense Inputs
should both be connected to the Kelvin Ground (Pin 2).
When used with a single supply, the Kelvin Ground and
VEE pins should be connected together. Separate gate
resistors are recommended to optimize the turn−on and
turn−off drive.
Kelvin Ground. The Current Sense Input should be tied
high because the two comparator outputs are ANDed
together. Although the reverse voltage on collector of
the IGBT is clamped to the emitter by the free−wheeling
diode, there is normally considerable inductance within
the package itself. A small resistor in series with the
diode can be used to protect the IC from reverse voltage
transients.
Figure 35. Basic Application
Figure 37. Desaturation Application
When using sense IGBTs or a sense resistor, the
sense voltage is applied to the Current Sense Input. The
sense trip voltages are referenced to the Kelvin Ground
pin. The sense voltage is very small, typically about 65
mV, and sensitive to noise. Therefore, the sense and
ground return conductors should be routed as a differen-
tial pair. An RC filter is useful in filtering any high fre-
quency noise. A blanking capacitor is connected from
the blanking pin to VEE. The stray capacitance on the
blanking pin provides a very small level of blanking if
left open. The blanking pin should not be grounded
when using current sensing, that would disable the sense.
The blanking pin should never be tied high, that would
short out the clamp transistor.
Figure 36. Dual Supply Application
When used in a dual supply application as in Figure
36, the Kelvin Ground should be connected to the emit-
ter of the IGBT. If the protection features are not used,
then both the Fault Blanking/Desaturation and the Cur-
rent Sense Inputs should be connected to Ground. The
input optoisolator should always be referenced to VEE.
If desaturation protection is desired, a high voltage
diode is connected to the Fault Blanking/Desaturation
pin. The blanking capacitor should be connected from
the Desaturation pin to the VEE pin. If a dual supply is
used, the blanking capacitor should be connected to the
Figure 38. Sense IGBT Application
Rev. 02