HCPL-315J Datasheet, PDF (13/21 Pages) Agilent(Hewlett-Packard) – 0.5 Amp Output Current IGBT Gate Drive Optocoupler

13
1
I_F = 7 to 16 mA
2
500 Ω
+
10 KHz ^–
50% DUTY
3
CYCLE
4
8
0.1 µF
I_F
7
+
–
V_CC = 15
to 30 V
t_r
V_O
6
47 Ω
3 nF
5
V_OUT
t_PLH
Figure 23. t_PLH, t_PHL, t_r, and t_f Test Circuit and Waveforms.
1
8
I_F
A
B
2
7
5V
+
–
3
6
4
5
+
V_CM = 1500 V
V_CM
0.1 µF
V_O
+
–
V_CC = 30 V
0V
∆t
V_O
SWITCH AT A: I_F = 10 mA
V_O
SWITCH AT B: I_F = 0 mA
Figure 24. CMR Test Circuit and Waveforms.
t_f
90%
50%
10%
t_PHL
δV ₌ V_CM
δt ∆t
V_OH
V_OL
Applications Information
Eliminating Negative IGBT
Gate Drive
To keep the IGBT firmly off, the
HCPL-3150/315J has a very low
maximum V_OL specification of
1.0 V. The HCPL-3150/315J
realizes this very low V_OL by using
a DMOS transistor with 4 Ω
(typical) on resistance in its pull
down circuit. When the
HCPL-3150/315J is in the low
state, the IGBT gate is shorted to
the emitter by Rg + 4 Ω.
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
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.)
+5 V
1
270 Ω
2
CONTROL
INPUT
3
74XXX
OPEN
4
COLLECTOR
HCPL-3150
8
0.1 µF
7
6
+ ^{VCC = 18 V}
–
Rg
Q1
5
Q2
Figure 25a. Recommended LED Drive and Application Circuit.
+ HVDC
3-PHASE
AC
- HVDC