HCPL-3150 Datasheet, PDF (14/22 Pages) Agilent(Hewlett-Packard) – 0.5 Amp Output Current IGBT Gate Drive Optocoupler

1
8
I_F = 7 to 16 mA
2
7
+ ^{500 Ω}
10 KHz ^–
50% DUTY
3
6
CYCLE
4
5
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
Figure 24. CMR Test Circuit and Waveforms.
0.1 µF
+
–
V_CC = 15
to 30 V
V_O
47 Ω
3 nF
I_F
t_r
V_OUT
t_PLH
V_CM
0.1 µF
HCPL-3150 fig 23
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
t_f
90%
50%
10%
t_PHL
δV ₌ V_CM
δt ∆t
V_OH
V_OL
Applications Information
Eliminating Negative IGBT Gate Drive
HCPL-3150 fig 24
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. Minimiz-
ing 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 de-
grade 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 tran-
sient 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
Figure 25a. Recommended LED Drive and Application Circuit.
8
0.1 µF
7
6
+ ^{VCC = 18 V}
–
Rg
Q1
5
Q2
14
HCPL-3150 fig 25
+ HVDC
3-PHASE
AC
- HVDC