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參數(shù)資料
| 型號： | HCPL-263L |
| 英文描述： | High Speed LVTTL Compatible 3.3 Volt Optocouplers |
| 中文描述： | 高速LVTTL兼容3.3伏光耦 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 187K |
| 代理商： | HCPL-263L |
Figure 13. Recommended drive circuit for High-CMR.
0.01 F
350
74LS04
OR ANY TOTEM-POLE
OUTPUT LOGIC GATE
VO
VCC+
8
7
6
1
3
SHIELD
5
2
4
HCPL-260L
GND
GND2
220
VCC
220
*
*
*
HIGHER CMR MAY BE OBTAINABLE BY CONNECTING PINS 1, 4 TO INPUT GROUND (GND1).
GND1
Application Information
Common-Mode Rejection for
HCPL-260L Families:
Figure 13 shows the recom-
mended drive circuit for optimal
common-mode rejection
performance. Two main points to
note are:
1. The enable pin is tied to V
CC
rather than floating (this
applies to single-channel parts
only).
2. Two LED-current setting
resistors are used instead of
one. This is to balance I
LED
variation during common-
mode transients.
If the enable pin is left floating, it
is possible for common-mode
transients to couple to the enable
pin, resulting in common-mode
failure. This failure mechanism
only occurs when the LED is on
and the output is in the Low
State. It is identified as occurring
when the transient output voltage
rises above 0.8 V. Therefore, the
enable pin should be connected
to either V
CC
or logic-level high
for best common-mode
performance with the output low
(CMR
L
). This failure mechanism
is only present in single-channel
parts which have the enable
function.
Also, common-mode transients
can capacitively couple from the
LED anode (or cathode) to the
output-side ground causing
current to be shunted away from
the LED (which can be bad if the
LED is on) or conversely cause
current to be injected into the
LED (bad if the LED is meant to
be off). Figure 14 shows the
parasitic capacitances which
exists between LED
anode/cathode and output ground
(C
LA
and C
LC
). Also shown in
Figure 14 on the input side is an
AC-equivalent circuit.
Figure 14. AC equivalent circuit.
350
1/2 R
LED
V
CC
+
15 pF
+
V
CM
8
7
6
1
3
SHIELD
5
2
4
C
LA
V
O
GND
0.01 F
1/2 R
LED
C
LC
I
LN
I
LP
–
For transients occurring when the
LED is on, common-mode rejec-
tion (CMR
L
, since the output is in
the
“
low
”
state) depends upon the
amount of LED current drive (I
F
).
For conditions where I
F
is close
to the switching threshold (I
TH
),
CMR
L
also depends on the extent
which I
LP
and I
LN
balance each
other. In other words, any
condition where common-mode
transients cause a momentary
decrease in I
F
will cause
common-mode failure for
transients which are fast enough.
Likewise for common-mode
transients which occur when the
LED is off (i.e. CMR
H
, since the
output is
“
high
”
), if an imbalance
between I
LP
and I
LN
results in a
transient I
F
equal to or greater
than the switching threshold of
the optocoupler, the transient
“
signal
”
may cause the output to
spike below 2 V (which consti-
tutes a CMR
H
failure).
By using the recommended
circuit in Figure 13, good CMR
can be achieved. The balanced
I
LED
-setting resistors help equalize
I
LP
and I
LN
to reduce the amount
by which I
LED
is modulated from
transient coupling through C
LA
and C
LC
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCPL-263L#020 | 功能描述:高速光耦合器 15MBd 2Ch 5mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-263L#300 | 功能描述:高速光耦合器 15MBd 2Ch 5mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-263L#500 | 功能描述:高速光耦合器 15MBd 2Ch 5mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-263L#520 | 功能描述:高速光耦合器 15MBd 2Ch 5mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
| HCPL-263L-000E | 功能描述:高速光耦合器 15MBd 2Ch 5mA RoHS:否 制造商:Avago Technologies 電流傳遞比: 最大波特率: 最大正向二極管電壓:1.75 V 最大反向二極管電壓:5 V 最大功率耗散:40 mW 最大工作溫度:+125 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-5 封裝:Tube |
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