5962-0420501HPA データシートの表示（PDF） - Broadcom Corporation
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5962-0420501HPA Datasheet PDF : 18 Pages
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HCPL-5150 and HCPL-5151,
DLA SMD 5962-04205
Data Sheet
Figure 25 Recommended LED Drive and Application Circuit
+5 V
1
270 :
2
CONTROL
INPUT
3
74XXX
4
OPEN
COLLECTOR
8
0.1 μF
7
6
5
+_ V CC = 18 V
Rg
Q1
Q2
Figure 26 Typical Application Circuit with Negative IGBT Gate Drive
+5 V
1
270 :
2
CONTROL
3
INPUT
74XXX
4
OPEN
COLLECTOR
8
0.1 μF
7
6
5
+_ V CC = 15 V
Rg
Q1
_ V EE = -5 V
+
Q2
+ HVDC
3-PHASE
AC
- HVDC
+ HVDC
3-PHASE
AC
- HVDC
PE Parameter
Description
IF
VF
Duty Cycle
LED Current
LED On Voltage
Maximum LED Duty Cycle
Po Parameter
Description
ICC
VCC
VEE
ESW (Rg, Qg)
Supply Current
Positive Supply Voltage
Negative Supply Voltage
Energy Dissipation in the HCPL-515x for
each IGBT Switching Cycle (See Figure 27.)
f
Switching Frequency
LED Drive Circuit Considerations for Ultra High
CMR Performance
Without a detector shield, the dominant cause of optocoupler
CMR failure is capacitive coupling from the input side of the
optocoupler, through the package, to the detector IC as shown
in Figure 28.
The HCPL-515x improves CMR performance by using a
detector IC with an optically transparent Faraday shield, which
diverts the capacitively coupled current away from the
sensitive IC circuitry. However, this shield does not eliminate
the capacitive coupling between the LED and optocoupler pins
5 to 8 as shown in Figure 29. This capacitive coupling causes
perturbations in the LED current during common mode
transients and becomes the major source of CMR failures for a
shielded optocoupler. The main design objective of a high CMR
LED drive circuit becomes keeping the LED in the proper state
(on or off ) during common mode transients. For example, the
recommended application circuit, (Figure 25) can achieve
10 kV/μs CMR while minimizing component complexity.
Techniques to keep the LED in the proper state are discussed in
the next two sections.
Broadcom
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