Hybrid IC IGBT Gate Driver VLA504 - Powerex
Hybrid IC IGBT Gate Driver VLA504 - Powerex
Hybrid IC IGBT Gate Driver VLA504 - Powerex
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<strong>Powerex</strong>, Inc., 173 Pavilion Lane, Youngwood, Pennsylvania 15697-1800 (724) 925-7272<br />
<strong>VLA504</strong><br />
<strong>Hybrid</strong> <strong>IC</strong> <strong>IGBT</strong> <strong>Gate</strong> <strong>Driver</strong><br />
START<br />
IS<br />
V CE > V SC<br />
YES<br />
IS<br />
INPUT<br />
SIGNAL<br />
ON<br />
NO<br />
NO<br />
becomes long enough so that the voltage on the detect<br />
Pin 1 is greater than V SC at the end of the t TRIP delay<br />
the driver will erroneously indicate that a short circuit<br />
has occurred. To avoid this condition the <strong>VLA504</strong> has<br />
provisions for extending the t TRIP delay by connecting a<br />
capacitor (C TRIP ) between Pin 2 and V CC (Pins 4). The<br />
effect of adding C TRIP on trip time is shown in Figure 3.<br />
If t TRIP is extended care must be exercised not to exceed<br />
the short-circuit withstanding capability of the <strong>IGBT</strong><br />
module. Normally this will be satisfied for <strong>Powerex</strong> NF and<br />
A-Series <strong>IGBT</strong> modules as long as the total shut-down<br />
time does not exceed 10µs.<br />
YES<br />
DELAY<br />
t trip<br />
FAULT SIGNAL<br />
(PIN 28)<br />
10V<br />
t timer<br />
10V<br />
YES<br />
t trip<br />
IS<br />
V CE > V SC<br />
NO<br />
YES<br />
SLOW SHUTDOWN<br />
DISABLE OUTPUT<br />
SET FAULT SIGNAL<br />
WAIT t timer<br />
-5V<br />
V O<br />
(PIN 23)<br />
Figure 3. Adjustment of ttrip<br />
YES<br />
IS<br />
INPUT<br />
SIGNAL<br />
OFF<br />
NO<br />
YES<br />
CLEAR FAULT<br />
SIGNAL<br />
ENABLE OUTPUT<br />
Figure 2. <strong>VLA504</strong>-01 Desaturation Detector<br />
6 Rev. 2/06
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