VLA500K-01R Powerex, Inc., VLA500K-01R Datasheet - Page 6

• Manufacturer Part Number: VLA500K-01R
• Description: Hybrid Ic Igbt Gate Driver + Dc/dc Converter
• Manufacturer: Powerex, Inc.


Powerex, Inc., 200 E. Hillis Street, Youngwood, Pennsylvania 15697-1800 [phone]
VLA500K-01R
Hybrid IC IGBT Gate Driver +
DC/DC Converter
Figure 2. VLA500K-01R Desaturation Detector
SET FAULT SIGNAL
SLOW SHUTDOWN
DISABLE OUTPUT
ENABLE OUTPUT
CLEAR FAULT
V CE > V SC
V CE > V SC
WAIT t timer
SIGNAL
SIGNAL
START
SIGNAL
DELAY
INPUT
INPUT
OFF
t trip
ON
IS
IS
IS
IS
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
larger series gate resistor to slow the switching of
the IGBT, reduce noise, and limit turn-off transient
voltages. When R
time of the IGBT will also increase. If the delay becomes
long enough so that the voltage on the detect Pin 30 is
greater than V
er will erroneously indicate that a short circuit has oc-
curred. To avoid this condition the VLA500K-01R has
provisions for extending the t
capacitor (C
22). A curve showing the effect of adding C
is given in the characteristic data section of this data
sheet. The waveform defining trip time (t
in Figure 3. If t
not to exceed the short-circuit withstanding capability
of the IGBT module. Normally this will be satisfied for
Powerex NF and A-Series IGBT modules as long as the
total shut-down time does not exceed 10µs.
Adjustment of Soft Shutdown Speed
As noted above the VLA500K-01R provides a soft turn-
off when a short circuit is detected in order to help limit
the transient voltage surge that occurs when large short
circuit currents are interrupted. The default shutdown
speed will work for most applications so adjustment is
usually not necessary. In this case C
In some applications using large modules or parallel
connected devices it may be helpful to make the shut-
down even softer.
connecting a capacitor (C
the effect of C
in the characteristic data section of this data sheet. The
waveform defining the fall time characteristics is shown
in Figure 3.
SHORT CIRCUIT
Figure 3. Adjustment of t trip and Slow Shutdown Speed
FAULT SIGNAL
(PIN 30 OPEN)
PROTECTION
DIAGRAM
(PIN 23)
(PIN 28)
TIMING
-5V
V O
trip
S
SC
) between Pin 29 and V
t trip
trip
on short circuit fall time (t
90%
50%
at the end of the t
G
is extended care must be exercised
t 1
is increased, the switching delay
10V
This can be accomplished by
10%
S
) at Pin 27. A curve showing
t 2
trip
t timer
delay by connecting a
trip
S
EE
can be omitted.
delay the driv-
trip
1
(Pins 21 and
, t
) is shown
trip
2
) is given
Rev. 5/07
on time
10V