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HCPL-3020 Fiches technique(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED

No de pièce HCPL-3020
Description  0.4 Amp Output Current IGBT Gate Drive Optocoupler
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Fabricant  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Site Internet  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

HCPL-3020 Fiches technique(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED

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11
Applications Information Eliminating Negative IGBT
Gate Drive
To keep the IGBT firmly off, the HCPL-3020 and HCPL-
0302 have a very low maximum VOL specification of
1.0 V. Minimizing Rg and the lead inductance from the
HCPL-3020 or HCPL-0302 to the IGBT gate and emitter
(possibly by mounting the HCPL-3020 or HCPL-0302 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 17. Care should be taken with such a PC
board design to avoid routing the IGBT collector or emit-
ter traces close to the HCPL-3020 or HCPL-0302 input as
this can result in unwanted coupling of transient signals
into the input of HCPL-3020 or HCPL-0302 and degrade
performance. (If the IGBT drain must be routed near the
HCPL-3020 or HCPL-0302 input, then the LED should be
reversebiasedwhenintheoffstate,topreventthetransient
signals coupled from the IGBT drain from turning on the
HCPL-3020 or HCPL-0302.
Figure 17. Recommended LED drive and application circuit for HCPL-3020 and HCPL-0302.
+ HVDC
3-PHASE
AC
- HVDC
0.1 µF
VCC = 15 V
1
3
+
2
4
8
6
7
5
HCPL-3020/0302
Rg
Q1
Q2
270
+5 V
CONTROL
INPUT
74XXX
OPEN
COLLECTOR


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