HCPL-3150 Datasheet, PDF (10/15 Pages) Agilent(Hewlett-Packard) – 0.5 Amp Output Current IGBT Gate Drive Optocoupler

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
t_f
90%
50%
10%
t_PHL
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
δV ₌ V_CM
δt ∆t
V_OH
V_OL
Figure 24. CMR Test Circuit and Waveforms.
Applications Information
Eliminating Negative IGBT
Gate Drive
To keep the IGBT firmly off, the
HCPL-3150 has a very low
maximum V_OL specification of
1.0 V. The HCPL-3150 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 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 to the IGBT gate
and emitter (possibly by
mounting the HCPL-3150 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
+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 25. Recommended LED Drive and Application Circuit.
routing the IGBT collector or
emitter traces close to the HCPL-
3150 input as this can result in
unwanted coupling of transient
signals into the HCPL-3150 and
degrade performance. (If the
IGBT drain must be routed near
the HCPL-3150 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.)
+ HVDC
3-PHASE
AC
- HVDC
1-206