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VLA500K-01R

Hybrid IC IGBT Gate Driver + DC/DC Converter

Powerex 

Powerex, Inc., 200 E. Hillis Street, Youngwood, Pennsylvania 15697-1800 (724) 925-7272

VLA500K-01R

Hybrid IC IGBT Gate Driver +

DC/DC Converter

START

IS

VCE > VSC

NO

YES

IS

INPUT

SIGNAL

ON

NO

YES

DELAY

ttrip

YES

IS

VCE > VSC

NO

YES

SLOW SHUTDOWN

DISABLE OUTPUT

SET FAULT SIGNAL

WAIT ttimer

YES

IS

INPUT

SIGNAL

OFF

NO

YES

CLEAR FAULT

SIGNAL

ENABLE OUTPUT

Figure 2. VLA500K-01R Desaturation Detector

larger series gate resistor to slow the switching of

the IGBT, reduce noise, and limit turn-off transient

voltages. When RG is increased, the switching delay

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 VSC at the end of the ttrip delay the driv-

er will erroneously indicate that a short circuit has oc-

curred. To avoid this condition the VLA500K-01R has

provisions for extending the ttrip delay by connecting a

capacitor (Ctrip) between Pin 29 and VEE (Pins 21 and

22). A curve showing the effect of adding Ctrip on time

is given in the characteristic data section of this data

sheet. The waveform defining trip time (ttrip) is shown

in Figure 3. If ttrip is extended care must be exercised

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 CS can be omitted.

In some applications using large modules or parallel

connected devices it may be helpful to make the shut-

down even softer. This can be accomplished by

connecting a capacitor (CS) at Pin 27. A curve showing

the effect of CS on short circuit fall time (t1, t2) is given

in the characteristic data section of this data sheet. The

waveform defining the fall time characteristics is shown

in Figure 3.

FAULT SIGNAL

ttimer

(PIN 28)

10V

10V

ttrip

SHORT CIRCUIT

PROTECTION

TIMING

DIAGRAM

(PIN 30 OPEN)

t1

t2

90%

50%

-5V

VO

(PIN 23)

10%

Figure 3. Adjustment of ttrip and Slow Shutdown Speed



Rev. 5/07

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