HCPL-314J-300 HP [Agilent(Hewlett-Packard)], HCPL-314J-300 Datasheet - Page 12

• Manufacturer Part Number: HCPL-314J-300
• Description: 0.4 Amp Output Current IGBT Gate Drive Optocoupler
• Manufacturer: HP [Agilent(Hewlett-Packard)]

Applications Information
Eliminating Negative IGBT
Gate Drive
To keep the IGBT firmly off,
the HCPL-J314 has a very low
maximum V
1.0 V. Minimizing Rg and
the lead inductance from the
HCPL-J314 to the IGBT gate and
emitter (possibly by mounting the
HCPL-J314 on a small PC board
directly above the IGBT) can
CONTROL
Figure 19. Recommended LED Drive and Application Circuit for HCPL-J314.
COLLECTOR
INPUT
+5 V
74XXX
OPEN
OL
270 Ω
specification of
1
2
3
4
HCPL-J314
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-J314 input as this can
result in unwanted coupling of
transient signals into the input of
HCPL-J314 and degrade
performance. (If the IGBT
8
7
6
5
0.1 µF
+
–
V
CC
Rg
= 15 V
Q1
Q2
drain must be routed near the
HCPL-J314 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-J314.)
12
3-PHASE
+ HVDC
- HVDC
AC