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參數(shù)資料
| 型號： | ACNW3130-500E |
| 元件分類： | 光電耦合器 |
| 英文描述： | 1 CHANNEL LOGIC OUTPUT OPTOCOUPLER |
| 封裝： | 0.300 INCH, ROHS COMPLIANT, SURFACE MOUNT, DIP-8 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 526K |
| 代理商： | ACNW3130-500E |
Figure 36. Not Recommended Open Collector Drive Circuit.
The open collector drive circuit, shown in Figure 36,
cannotkeeptheLEDoffduringa+dVcm/dttransient,since
all the current flowing through CLEDN must be supplied
by the LED, and it is not recommended for applications
requiring ultra high CMRL performance. Figure 37 is an
alternative drive circuit which, like the recommended
applicationcircuit(Figure29),doesachieveultrahighCMR
performancebyshuntingtheLEDintheoffstate.
Figure 35. Equivalent Circuit for Figure 29 During Common Mode Tran-
sient.
CMR with the LED On (CMRH)
AhighCMRLEDdrivecircuitmustkeeptheLEDonduring
commonmodetransients.Thisisachievedbyoverdriving
theLEDcurrentbeyondtheinputthresholdsothatitisnot
pulledbelowthethresholdduringatransient.Aminimum
LEDcurrentof10mAprovidesadequatemarginoverthe
maximumIFLHof5mAtoachieve40kV/μsCMR.
CMR with the LED Off (CMRL)
A high CMR LED drive circuit must keep the LED off (VF
VF(OFF))duringcommonmodetransients.Forexample,
during a -dVcm/dt transient in Figure 35, the current
flowing through CLEDP also flows through the RSAT and
VSAT of the logic gate. As long as the low state voltage
developedacrossthelogicgateislessthanVF(OFF),theLED
willremainoffandnocommonmodefailurewilloccur.
Figure 34. Optocoupler Input to Output Capacitance Model for Shielded
Optocouplers.
Figure 33. Optocoupler Input to Output Capacitance Model for Unshield-
ed Optocouplers.
1
3
2
4
8
6
7
5
CLEDP
CLEDN
1
3
2
4
8
6
7
5
CLEDP
CLEDN
SHIELD
CLEDO1
CLEDO2
Rg
1
3
VSAT
2
4
8
6
7
5
+
VCM
ILEDP
CLEDP
CLEDN
SHIELD
* THE ARROWS INDICATE THE DIRECTION
OF CURRENT FLOW DURING
- dV CM /dt.
+5 V
+
- VCC = 18 V
0.1
F
+
-
1
3
2
4
8
6
7
5
CLEDP
CLEDN
SHIELD
+5 V
Q1
ILEDN
LED Drive Circuit Considerations for Ultra High CMR Per-
formance. (Discussion applies to ACPL-3130, ACPL-J313,
and ACNW3130)
Without a detector shield, the dominant cause of
optocoupler CMR failure is capacitive coupling from the
inputsideoftheoptocoupler,throughthepackage,tothe
detectorICasshowninFigure33.TheACPL-3130improves
CMRperformancebyusingadetectorICwithanoptically
transparentFaradayshield,whichdivertsthecapacitively
coupled current away from the sensitive IC circuitry.
However, this shield does not eliminate the capacitive
coupling between the LED and optocoupler pins 5-8
as shown in Figure 34. This capacitive coupling causes
perturbations in the LED current during common mode
transientsandbecomesthemajorsourceofCMRfailures
forashieldedoptocoupler.Themaindesignobjectiveofa
highCMRLEDdrivecircuitbecomeskeepingtheLEDinthe
properstate(onoroff)duringcommonmodetransients.
For example, the recommended application circuit
(Figure 29), can achieve 40 kV/s CMR while minimizing
componentcomplexity.
Techniques to keep the LED in the proper state are dis-
cussed in the next two sections.
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