HCPL3150300E AVAGO TECH, HCPL3150300E Datasheet - Page 13

• Manufacturer Part Number: HCPL3150300E
• Manufacturer: AVAGO TECH

50% DUTY
Figure 23. t
5 V
Figure 24. CMR Test Circuit and Waveforms.
Applications Information
Eliminating Negative IGBT
Gate Drive
To keep the IGBT firmly off, the
HCPL-3150/315J has a very low
maximum V
1.0 V. The HCPL-3150/315J
realizes this very low V
a DMOS transistor with 4
(typical) on resistance in its pull
down circuit. When the
HCPL-3150/315J is in the low
state, the IGBT gate is shorted to
Figure 25a. Recommended LED Drive and Application Circuit.
CONTROL
10 KHz
CYCLE
COLLECTOR
INPUT
+
–
I
F
= 7 to 16 mA
+5 V
+
–
I
74XXX
F
OPEN
500
A
B
PLH
OL
270
, t
1
2
3
4
1
2
3
4
specification of
PHL
, t
r
, and t
V
1
2
3
4
CM
OL
+
= 1500 V
by using
f
Test Circuit and Waveforms.
HCPL-3150
8
7
6
5
8
7
6
5
the emitter by Rg + 4 .
Minimizing Rg and the lead
inductance from the HCPL-3150/
315J to the IGBT gate and
emitter (possibly by mounting the
HCPL-3150/315J 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
25. Care should be taken with
such a PC board design to avoid
routing the IGBT collector or
0.1 µF
0.1 µF
8
7
6
5
0.1 µF
47
V
3 nF
O
V
O
+
–
+
–
V
V
CC
to 30 V
CC
+
–
= 30 V
V
= 15
CC
Rg
= 18 V
V
0 V
V
SWITCH AT A: I
V
SWITCH AT B: I
Q1
Q2
CM
O
O
I
V
F
OUT
t
PLH
F
F
t
t
= 10 mA
= 0 mA
r
13
emitter traces close to the HCPL-
3150/315J input as this can result
in unwanted coupling of transient
signals into the HCPL-3150/315J
and degrade performance. (If the
IGBT drain must be routed near
the HCPL-3150/315J 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-3150/315J.)
3-PHASE
+ HVDC
- HVDC
AC
t
PHL
t
f
90%
50%
10%
V
t
=
V
CM
t
V
V
OH
OL