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HCPL-314J-XXXE Scheda tecnica(PDF) 11 Page - Agilent(Hewlett-Packard)

Il numero della parte HCPL-314J-XXXE
Spiegazioni elettronici  0.4 Amp Output Current IGBT Gate Drive Optocoupler
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Produttore elettronici  HP [Agilent(Hewlett-Packard)]
Homepage  http://www.home.agilent.com
Logo HP - Agilent(Hewlett-Packard)

HCPL-314J-XXXE Scheda tecnica(HTML) 11 Page - Agilent(Hewlett-Packard)

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11
Applications Information
Eliminating Negative IGBT
Gate Drive
To keep the IGBT firmly off,
the HCPL-314J has a very low
maximum VOL specification of
1.0 V. Minimizing Rg and
the lead inductance from the
HCPL-314J to the IGBT gate and
emitter (possibly by mounting the
HCPL-314J on a small PC board
directly above the IGBT) can
eliminate the need for negative
IGBT gate drive in many
applications as shown in
Figure 19. Care should be taken
with such a PC board design to
avoid routing the IGBT collector
or emitter traces close to the
HCPL-314J input as this can
result in unwanted coupling of
transient signals into the input of
HCPL-314J and degrade
performance. (If the IGBT
drain must be routed near the
HCPL-314J input, then the LED
should be reverse biased when in
the off state, to prevent the
transient signals coupled from
the IGBT drain from turning on
the HCPL-314J.) An external
clamp diode may be connected
between pins 14 & 15 and pins 9
& 10 (as shown in Figure 19) for
the protection of HCPL-314J in
the case of IGBTs switching
inductive load.
Figure 19. Recommended LED Drive and Application Circuit for HCPL-314J.
+ HVDC
3-PHASE
AC
0.1 µF
FLOATING
SUPPLY
VCC = 18 V
1
3
+
–
2
16
14
15
270
Ω
HCPL-314J
+5 V
CONTROL
INPUT
Rg
74XX
OPEN
COLLECTOR
GND 1
7
6
8
10
11
9
- HVDC
0.1 µF
VCC = 18 V
+
–
Rg
270
Ω
+5 V
CONTROL
INPUT
74XX
OPEN
COLLECTOR
GND 1
VOL


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