HCPL-0302-000E Datasheet, PDF (11/15 Pages) AVAGO TECHNOLOGIES LIMITED – 0.4 Amp Output Current IGBT Gate Drive Optocoupler

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
reverse biased when in the off state, to prevent the transient
signals coupled from the IGBT drain from turning on the
HCPL-3020 or HCPL-0302.
+5 V
270 Ω
CONTROL
INPUT
74XXX
OPEN
COLLECTOR
HCPL-3020/0302
1
8
0.1 µF
+V^{CC = 15 V}
–
2
7
Rg
Q1
3
6
4
5
Q2
Figure 17. Recommended LED drive and application circuit for HCPL-3020 and HCPL-0302.
+ HVDC
3-PHASE
AC
- HVDC
11