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VLA503-01

Hybrid IC IGBT Gate Driver

Powerex 

Powerex, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272

VLA503-01

Hybrid IC IGBT Gate Driver

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

long enough so that the voltage on the detect Pin 1 is

greater than VSC at the end of the tTRIP delay the driver

will erroneously indicate that a short circuit has occurred.

To avoid this condition the VLA503-01 has provisions for

extending the tTRIP delay by connecting a capacitor

(CTRIP) between Pin 2 and VCC (Pins 4). The effect of

adding CTRIP on trip time is shown in Figure 3. If tTRIP

is extended care must be exercised not to exceed the

short-circuit withstanding capability of the IGBT mod-

ule. 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.

FAULT SIGNAL

ttimer

(PIN 8)

10V

10V

ttrip

-5V

VO

(PIN 5)

Figure 3. Adjustment of ttrip

YES

IS

INPUT

SIGNAL

OFF

NO

YES

CLEAR FAULT

SIGNAL

ENABLE OUTPUT

Figure 2. VLA503-01 Desaturation Detector



Rev. 04/07

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