HCPL-3760 [HP]
AC/DC to Logic Interface Optocouplers; AC / DC到逻辑接口光电耦合器
| 型号： | HCPL-3760 |
| 厂家： | 
HEWLETT-PACKARD |
| 描述： | AC/DC to Logic Interface Optocouplers |
| 文件： | 总13页 (文件大小：231K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
H
AC/DC to Logic Interface
Optocouplers
Technical Data
HCPL-3700
HCPL-3760
Features
• Standard (HCPL-3700) and
Low Input Current
(HCPL-3760) Versions
• AC or DC Input
• Programmable Sense Voltage
• Hysteresis
• Logic Compatible Output
• Thresholds Guaranteed over
Temperature
Description
The HCPL-3700 and HCPL-3760
are voltage/current threshold
detection optocouplers. The
HCPL-3760 is a low-current
version of the HCPL-3700. To
obtain lower current operation,
the HCPL-3760 uses a high-
efficiency AlGaAs LED which
provides higher light output at
lower drive currents. Both
The input buffer incorporates
several features: hysteresis for
extra noise immunity and
switching immunity, a diode
bridge for easy use with ac input
signals, and internal clamping
• Thresholds Independent of
LED Optical Parameters
devices utilize threshold sensing
input buffer ICs which permit
control of threshold levels over a
wide range of input voltages with
a single external resistor.
• Recognized under UL 1577
and CSA Approved for
Dielectric Withstand Proof
Test Voltage of 2500 Vac, 1
Minute
Functional Diagram
Applications
• Limit Switch Sensing
• Low Voltage Detector
• 5 V-240 V AC/DC Voltage
Sensing
• Relay Contact Monitor
• Relay Coil Voltage Monitor
• Current Sensing
AC
1
8
7
6
5
V
CC
DC+
DC-
AC
2
3
4
NC
V
O
GND
• Microprocessor Interfacing
TRUTH TABLE
(POSITIVE LOGIC)
INPUT OUTPUT
H
L
L
H
CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to
prevent damage and/or degradation which may be induced by ESD.
1-348
5965-3582E
diodes to protect the buffer and
LED from a wide range of over-
voltage and over-current
transients. Because threshold
sensing is done prior to driving
the LED, variations in optical
coupling from the LED to the
detector will have no effect on the
threshold levels.
The buffer IC for the HCPL-3760
was redesigned to permit a lower
input current. The nominal turn
on threshold for the HCPL-3760
is 1.2 mA (ITH +) and 3.7 volts
(VTH +).
saturation voltages and CMOS
compatible breakdown voltages.
By combining several unique
functions in a single package, the
user is provided with an ideal
component for industrial control
computer input boards and other
applications where a predeter-
mined input threshold level is
desirable.
The high gain output stage
features an open collector output
providing both TTL compatible
The HCPL-3700's input buffer IC
has a nominal turn on threshold
of 2.5 mA (ITH +) and 3.7 volts
(VTH +).
Ordering Information
Specify Part Number followed by Option Number (if desired)
Example
HCPL-3700#XXX
300 = Gull Wing Surface Mount Option
500 = Tape/Reel Package Option (1 K min.)
Option data sheets available. Contact your Hewlett-Packard sales representative or authorized distributor for
information.
Schematic
1-349
Package Outline Drawings
Standard DIP Package
9.40 (0.370)
9.90 (0.390)
8
1
7
6
5
TYPE NUMBER
DATE CODE
0.20 (0.008)
0.33 (0.013)
6.10 (0.240)
6.60 (0.260)
HP XXXX
YYWW
7.36 (0.290)
7.88 (0.310)
U R
4
5° TYP.
UL
2
3
RECOGNITION
PIN ONE
1.19 (0.047) MAX.
1.78 (0.070) MAX.
1
2
AC
V
8
7
4.70 (0.185) MAX.
0.51 (0.020) MIN.
CC
DC+
NC
3
4
DC-
AC
V
6
5
O
2.92 (0.115) MIN.
GND
0.76 (0.030)
1.40 (0.056)
0.65 (0.025) MAX.
2.28 (0.090)
2.80 (0.110)
DIMENSIONS IN MILLIMETERS AND (INCHES).
Gull Wing Surface Mount Option 300
PAD LOCATION (FOR REFERENCE ONLY)
9.65 ± 0.25
(0.380 ± 0.010)
1.016 (0.040)
1.194 (0.047)
7
6
5
8
1
4.826
TYP.
TYPE NUMBER
DATE CODE
(0.190)
HP XXXX
YYWW
6.350 ± 0.25
(0.250 ± 0.010)
U R
4
9.398 (0.370)
9.906 (0.390)
2
3
MOLDED
0.381 (0.015)
0.635 (0.025)
UL
RECOGNITION
1.194 (0.047)
1.778 (0.070)
9.65 ± 0.25
(0.380 ± 0.010)
1.780
(0.070)
MAX.
1.19
(0.047)
MAX.
7.62 ± 0.25
(0.300 ± 0.010)
0.20 (0.008)
0.33 (0.013)
4.19
MAX.
(0.165)
0.635 ± 0.25
(0.025 ± 0.010)
1.080 ± 0.320
(0.043 ± 0.013)
0.635 ± 0.130
(0.025 ± 0.005)
12° NOM.
2.540
(0.100)
BSC
DIMENSIONS IN MILLIMETERS (INCHES).
TOLERANCES (UNLESS OTHERWISE SPECIFIED): xx.xx = 0.01
xx.xxx = 0.005
LEAD COPLANARITY
MAXIMUM: 0.102 (0.004)
1-350
Maximum Solder Reflow Thermal Profile
260
240
∆T = 145°C, 1°C/SEC
220
200
180
160
140
120
100
80
∆T = 115°C, 0.3°C/SEC
∆T = 100°C, 1.5°C/SEC
60
40
20
0
0
1
2
3
4
5
6
7
8
9
10
11
12
TIME – MINUTES
(NOTE: USE OF NON-CHLORINE ACTIVATED FLUXES IS RECOMMENDED.)
Regulatory Information
The HCPL-3700/60 has been
approved by the following
organizations:
UL
Recognized under UL 1577,
component recognition program,
File E55361.
CSA
Approved under CSA Component
Acceptance Notice #5, File CA
88324.
1-351
Insulation and Safety Related Specifications
Parameter
Symbol Value Units
Conditions
Min. External Air Gap
(External Clearance)
L(IO1)
7.1
mm
Measured from input terminals to output terminals,
shortest distance through air
Min. External Tracking
Path (External Creepage)
L(IO2)
7.4
mm
Measured from input terminals to output terminals,
shortest distance path along body
Min. Internal Plastic
Gap (Internal Clearance)
0.08 mm
Through insulation distance, conductor to conductor,
usually the direct distance between the photoemitter
and photodetector inside the optocoupler cavity
Tracking Resistance
(Comparative
Tracking Index)
CTI
200
IIIa
V
DIN IEC 112/VDE 0303 PART 1
Isolation Group
Material Group (DIN VDE 0110, 1/89, Table 1)
Option 300 – surface mount classification is Class A in accordance with CECC 00802.
Absolute Maximum Ratings (No derating required up to 70°C)
Parameter
Storage Temperature
Symbol
Min.
-55
Max.
125
85
Units
°C
Note
TS
TA
Operating Temperature
Lead Soldering Cycle
-40
°C
Temperature
Time
260
10
°C
1
s
Input Current
Average
Surge
50
2
IIN
140
500
mA
2, 3
Transient
Input Voltage (Pins 2-3)
Input Power Dissipation
VIN
PIN
PT
-0.5
V
230
305
210
30
mW
mW
mW
mA
V
4
5
6
7
Total Package Power Dissipation
Output Power Dissipation
PO
Output Current
Average
IO
Supply Voltage (Pins 8-5)
Output Voltage (Pins 6-5)
Solder Reflow Temperature Profile
VCC
VO
-0.5
-0.5
20
20
V
See Package Outline Drawings section
Recommended Operating Conditions
Parameter
Symbol
Min.
Max.
18
Units
V
Note
Supply Voltage
VCC
TA
f
2
0
0
Operating Temperature
Operating Frequency
70
°C
4
kHz
8
1-352
Electrical Specifications
Over Recommended Temperature T = 0°C to 70°C, Unless Otherwise Specified.
A
Parameter
Input Threshold
Current
Sym.
Device
Min. Typ.[9] Max. Units
Conditions
Fig. Note
ITH+ HCPL-3700 1.96
HCPL-3760 0.87
2.5
1.2
1.3
0.6
3.7
3.11
1.56
1.62
0.80
4.05
mA
V
IN = VTH+; VCC = 4.5 V;
VO = 0.4 V; IO ≥ 4.2 mA
2, 3 14
ITH- HCPL-3700 1.00
HCPL-3760 0.43
V
IN = VTH-; VCC = 4.5 V;
VO = 2.4 V; IOH ≤ 100 µA
IN = V2 - V3; Pins 1 & 4 Open
VCC = 4.5 V; VO = 0.4 V;
O ≥ 4.2 mA
IN = V2 - V3; Pins 1 & 4 Open
VCC = 4.5 V; VO = 2.4 V;
O ≤ 100 µA
Input
DC
VTH+
3.35
2.01
4.23
V
V
V
V
Threshold (Pins 2, 3)
Voltage
I
VTH-
2.6
4.9
2.86
5.50
V
I
AC
VTH+
VIN = |V1 - V4|;
14, 15
(Pins 1, 4)
Pins 2 & 3 Open
VCC = 4.5 V; VO = 0.4 V;
IO ≥ 4.2 mA
VTH-
2.87
3.7
4.20
V
V
IN = |V1 - V |;
4
Pins 2 & 3 Open
VCC = 4.5 V; VO = 2.4 V;
IO ≤ 100 µA
Hysteresis
IHYS HCPL-3700
HCPL-3760
VHYS
1.2
0.6
1.2
6.0
mA IHYS = ITH+ – ITH-
2
1
V
V
VHYS = VTH+ – VTH-
IHC1 = V2 - V3; V3 = GND;
Input Clamp Voltage
VIHC1
5.4
6.1
6.6
7.3
V
IIN = 10 mA; Pins 1 & 4
Connected to Pin 3
V
IHC2
6.7
V
VIHC2 = |V - V |;
1 4
|IIN| = 10 mA;
Pins 2 & 3 Open
V
12.0
13.4
V
V
V
IHC3 = V2 - V3; V = GND;
IHC3
3
IIN = 15 mA; Pins 1 & 4 Open
V
-0.76
VILC = V2 - V ; V = GND;
3 3
ILC
IIN = -10 mA
Input Current
IIN HCPL-3700 3.0
HCPL-3760 1.5
VD1,2 HCPL-3700
HCPL-3760
3.7
1.8
4.4
2.2
mA
V
= V – V3 = 5.0 V
5
IN
2
Pins 1 & 4 Open
Bridge Diode
Forward Voltage
0.59
0.51
0.74
0.71
0.1
V
V
IIN = 3 mA
IIN = 1.5 mA
VD3,4 HCPL-3700
HCPL-3760
IIN = 3 mA
IIN = 1.5 mA
Logic Low Output
Voltage
VOL
0.4
VCC = 4.5 V; IOL = 4.2 mA
5
14
14
Logic High
IOH
100
µA VOH = VCC = 18 V
Output Current
Logic Low Supply
Current
ICCL HCPL-3700
HCPL-3760
ICCH
1.2
0.7
4
3
4
mA V2 – V3 = 5.0 V; VO = Open;
VCC = 5.0 V
6
4
Logic High Supply
Current
0.002
µA VCC = 18 V; VO = Open
14
Input Capacitance
CIN
50
pF f = 1 MHz; VIN = 0 V,
Pins 2 & 3, Pins 1 & 4 Open
1-353
Switching Specifications
TA = 25°C, VCC = 5.0 V, Unless Otherwise Specified.
Parameter
Sym.
Device
Min.
Typ.
Max. Units
Test Conditions
Fig.
Note
Propagation Delay
Time to Logic Low
at Output
HCPL-3700
4.0
tPHL
15.0
40.0
µs
µs
RL = 4.7 kΩ, CL = 30 pF
10
HCPL-3760
HCPL-3700
4.5
7, 10
Propagation Delay
Time to Logic High
at Output
10.0
tPLH
RL = 4.7 kΩ, CL = 30 pF
11
HCPL-3760
HCPL-3700
8.0
20
Output Rise Time
(10-90%)
tr
µs
µs
RL = 4.7 kΩ, CL = 30 pF
RL = 4.7 kΩ, CL = 30 pF
HCPL-3760
HCPL-3700
14
8
0.3
Output Fall Time
(90-10%)
tf
HCPL-3760
0.4
Common Mode
IIN = 0 mA, RL = 4.7 kΩ,
Transient Immunity
at Logic High Output
|CMH|
|CML|
4000
V/µs
V/µs
VO min = 2.0 V, VCM = 1400 V
9, 11 12, 13
Common Mode
Transient Immunity
at Logic Low Output
HCPL-3700
HCPL-3760
IIN = 3.11 mA RL = 4.7 kΩ,
VO max = 0.8 V,
IIN = 1.56 mA VCM = 140 V
600
Package Characteristics
Over Recommended Temperature TA = 0°C to 70°C, Unless Otherwise Specified.
Parameter
Sym. Min. Typ.[9] Max. Units
Conditions
Fig. Note
Input-Output Momentary
Withstand Voltage*
V
ISO
2500
V rms RH ≤ 50%, t = 1 min;
TA = 25°C
16,
17
Input-Output Resistance
Input-Output Capacitance
RI-O
CI-O
1012
0.6
Ω
V
I-O = 500 Vdc
16
pF
f = 1 MHz; VI-O = 0 Vdc
*The Input-Output Momentary Withstand Voltage is a dielectric voltage rating that should not be interpreted as an input-output
continuous voltage rating. For the continuous voltage rating refer to the VDE 0884 Insulation Characteristics Table (if applicable), your
equipment level safety specification, or HP Application Note 1074, “Optocoupler Input-Output Endurance Voltage.”
1-354
Notes:
1. Measured at a point 1.6 mm below seating plane.
2. Current into/out of any single lead.
3. Surge input current duration is 3 ms at 120 Hz pulse repetition rate. Transient input current duration is 10 µs at 120 Hz pulse
repetition rate. Note that maximum input power, PIN, must be observed.
4. Derate linearly above 70°C free-air temperature at a rate of 4.1 mW/°C. Maximum input power dissipation of 230 mW allows an input
IC junction temperature of 125°C at an ambient temperature of TA = 70°C with a typical thermal resistance from junction to ambient
of θJA1 = 240°C/W. Excessive PIN and TJ may result in IC chip degradation.
5. Derate linearly above 70°C free-air temperature at a rate of 5.4 mW/°C.
6. Derate linearly above 70°C free-air temperature at a rate of 3.9 mW/°C. Maximum output power dissipation of 210 mW allows an
output IC junction temperature of 125°C at an ambient temperature of TA = 70°C with a typical thermal resistance from junction to
ambient of θJA0 = 265°C/W.
7. Derate linearly above 70°C free-air temperature at a rate of 0.6 mA/°C.
8. Maximum operating frequency is defined when output waveform Pin 6 obtains only 90% of VCC with RL = 4.7 kΩ, CL = 30 pF using
a 5 V square wave input signal.
9. All typical values are at TA = 25°C, VCC = 5.0 V unless otherwise stated.
10. The tPHL propagation delay is measured from the 2.5 V level of the leading edge of a 5.0 V input pulse (1 µs rise time) to the 1.5 V
level on the leading edge of the output pulse (see Figure 10).
11. The tPLH propagation delay is measured from the 2.5 V level of the trailing edge of a 5.0 V input pulse (1 µs fall time) to the 1.5 V
level on the trailing edge of the output pulse (see Figure 10).
12. Common mode transient immunity in Logic High level is the maximum tolerable (positive) dVCM/dt on the leading edge of the
common mode pulse, VCM, to insure that the output will remain in a Logic High state (i.e., VO > 2.0 V). Common mode transient
immunity in Logic Low level is the maximum tolerable (negative) dVCM/dt on the trailing edge of the common mode pulse signal,
VCM, to insure that the output will remain in a Logic Low state (i.e., VO < 0.8 V). See Figure 11.
13. In applications where dVCM/dt may exceed 50,000 V/µs (such as static discharge), a series resistor, RCC, should be included to
protect the detector IC from destructively high surge currents. The recommended value for RCC is 240 Ω per volt of allowable drop
in VCC (between Pin 8 and VCC) with a minimum value of 240 Ω.
14. Logic low output level at Pin 6 occurs under the conditions of VIN ≥ VTH+ as well as the range of VIN > VTH– once VIN has exceeded
VTH+. Logic high output level at Pin 6 occurs under the conditions of VIN ≤ VTH- as well as the range of VIN < VTH+ once VIN has
decreased below VTH-
.
15. AC voltage is instantaneous voltage.
16. Device considered a two terminal device: Pins 1, 2, 3, 4 connected together, and Pins 5, 6, 7, 8 connected together.
17. In accordance with UL 1577, each optocoupler is proof tested by applying an insulation test voltage ≥ 3000 V rms for 1 second
(leakage detection current limit, Ii-o ≤ 5 µA).
Figure 1. Typical Input Characteristics, IIN vs. VIN (AC Voltage is Instantaneous Value).
1-355
INPUT
DEVICE
TH+
TH–
CONNNECTION
ITH
HCPL-3700 2.5 mA 1.3 mA
HCPL-3760 1.2 mA 0.6 mA
PINS 2, 3
OR 1, 4
VTH(dc)
VTH(ac)
BOTH
BOTH
3.7 V
4.9 V
2.6 V
3.7 V
PINS 2, 3
PINS 1, 4
Figure 2. Typical Transfer Characteristics.
HCPL-3700
HCPL-3760
4.2
4.0
3.8
3.6
3.4
3.2
3.0
2.8
2.6
2.4
4.2
4.0
3.8
3.6
3.4
1.6
1.5
1.4
1.3
1.2
V
I
TH+
V
I
TH+
TH+
TH+
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.1
1.0
0.9
0.8
0.7
0.6
0.5
V
TH-
TH-
V
TH-
I
I
TH-
0.4
-40 -20
T
0
20
40
60
80
-40 -25
0
25
– TEMPERATURE – °C
A
50
75 85
– TEMPERATURE – °C
T
A
Figure 3. Typical DC Threshold Levels vs. Temperature.
1-356
0
10
I
-1
-2
-3
CCH
= 18 V
10
10
10
I
CCH
V
V
I
CC
= OPEN
= 0 mA
O
IN
-4
10
10
-5
-40 -25
0
25
50
75 85
T
– TEMPERATURE – °C
A
Figure 4. Typical High Level Supply Current, ICCH vs.
Temperature.
HCPL-3700
HCPL-3760
4.2
4.0
3.8
3.6
3.4
240
220
200
180
160
2.1
2.0
1.9
1.8
1.7
240
220
200
180
160
I
IN
= 5.0 V
I
IN
V
IN
(PINS 2, 3)
V
= 5.0 V
IN
(PINS 2, 3)
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
140
120
100
80
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
140
120
100
80
V
= 5.0 V
CC
V
= 5.0 V
CC
V
V
OL
OL
= 5.0 V
V
I
= 5.0 V
= 4.2 mA
V
I
CC
CC
= 4.2 mA
60
60
OL
OL
40
40
20
20
0
0
-40 -20
T
0
20
40
60
80
-40 -25
0
25
– TEMPERATURE – °C
A
50
75 85
– TEMPERATURE – °C
T
A
Figure 5. Typical Input Current, IIN, and Low Level Output Voltage, VOL, vs. Temperature.
HCPL-3700
HCPL-3760
4.00
3.50
3.00
3.00
2.50
2.00
1.50
1.00
0.50
0
2.50
2.00
1.50
1.00
0.50
0
4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
V
– SUPPLY VOLTAGE – V
V
– SUPPLY VOLTAGE – V
CC
CC
Figure 6. Typical Logic Low Supply Current vs. Supply Voltage.
1-357
HCPL-3700
HCPL-3760
24
22
20
18
16
24
22
20
18
16
R
C
V
= 4.7 kΩ
= 30 pF
= 5.0 V
R
C
V
= 4.7 kΩ
= 30 pF
= 5.0 V
L
L
CC
L
L
CC
5.0 V
5.0 V
1 ms PULSE WIDTH
f = 100 Hz
1 ms PULSE WIDTH
f = 100 Hz
V
=
V
=
IN
IN
t , t = 1 µs (10-90%)
t , t = 1 µs (10-90%)
r
f
t
t
r
f
PLH
t
t
14
12
10
8
14
12
10
8
PLH
6
6
4
4
PHL
PHL
2
2
0
0
-40 -20
T
0
20
40
60
80
-40 -25
0
25
50
75 85
– TEMPERATURE – °C
T
– TEMPERATURE – °C
A
A
Figure 7. Typical Propagation Delay vs. Temperature.
HCPL-3700
HCPL-3760
60
50
40
30
20
600
500
400
300
200
30
700
R
C
V
= 4.7 kΩ
= 30 pF
= 5.0 V
L
L
CC
25
20
15
10
5
600
500
400
300
200
100
5.0 V
1 ms PULSE WIDTH
f = 100 Hz
V
=
IN
t , t = 1 µs (10-90%)
r
f
t
f
R
C
V
= 4.7 kΩ
L
L
t
= 30 pF
= 5.0 V
r
CC
5.0 V
t
r
1 ms PULSE WIDTH
f = 100 Hz
t , t = 1 µs (10-90%)
V
=
IN
t
10
0
100
0
f
r
f
0
-40 -20
T
0
20
40
60
80
-40 -25
0
25
50
75 85
– TEMPERATURE – °C
T
– TEMPERATURE – °C
A
A
Figure 8. Typical Rise, Fall Times vs. Temperature.
5000
V
I
= 5.0 V
CC
IN
= 3.11 mA (3700)
= 1.53 mA (3760)
= 0.8 V
= 4.7 kΩ
= 25 °C
I
IN
OL
4000
3000
2000
V
R
T
L
A
CM
V
= 5.0 V CM
CC
L
H
I
= 0 mA
= 2.0 V
IN
V
R
T
OH
= 4.7 kΩ
L
= 25 °C
A
1000
500
0
0
400
800
1200
1600
2000
V
– COMMON MODE TRANSIENT AMPLITUDE – V
CM
Figure 9. Common Mode Transient Immunity
vs. Common Mode Transient Amplitude.
1-358
Figure 10. Switching Test Circuit.
Figure 11. Test Circuit for Common Mode Transient Immunity and Typical Waveforms.
V
V
V
V
= 3.7 V
= 2.6 V
= 4.9 V
= 3.7 V
TH+
TH–
TH+
TH–
I
I
T
= 2.5 mA
= 1.3 mA
= 25 °C
TH+
TH–
A
Figure 12. Typical External Threshold Characteristics, V± vs. RX.
1-359
Figure 13. External Threshold Voltage Level Selection.
Electrical Considerations
The HCPL-3700/3760 optocoup-
lers have internal temperature
compensated, predictable voltage
and current threshold points
which allow selection of an
external resistor, RX, to determine
larger external threshold voltage
levels. For a desired external
threshold voltage, V± , a corre-
sponding typical value of RX can
be obtained from Figure 12.
The low clamp condition in
For one specifically selected
external threshold voltage level
conjunction with the low input
current feature will ensure
extremely low input power
dissipation.
V+ or V, RX can be determined
-
without use of RP via
V - V
+ (-) TH+(-)
In applications where dVCM/dt
may be extremely large (such as
static discharge), a series resistor,
RCC, should be connected in
series with VCC and Pin 8 to pro-
tect the detector IC from destruc-
tively high surge currents. See
Note 13 for determination of RCC
In addition, it is recommended
that a ceramic disc bypass
capacitor of 0.01 µF be placed
between Pins 8 and 5 to reduce
the effect of power supply noise.
RX =
(1)
ITH+
(-)
For two specifically selected
external threshold voltage levels,
V+ and V-, the use of RX and RP
will permit this selection via
equations (2), (3) provided the
following conditions are met. If
the denominator of equation (2)
is positive, then
Specific calculation of RX can be
obtained from Equation (1).
.
Specification of both V+ and V
-
voltage threshold levels simul-
taneously can be obtained by the
use of RX and RP as shown in
Figure 13 and determined by
Equations (2) and (3).
V+
V-
VTH+
VTH-
V+ - VTH+ ITH+
and <
≥
For interfacing ac signals to TTL
V- - VTH-
ITH-
systems, output low pass filtering
can be performed with a pullup
resistor of 1.5 kΩ and 20 µF
capacitor. This application
requires a Schmitt trigger gate to
avoid slow rise time chatter
problems. For ac input applica-
tions, a filter capacitor can be
placed across the dc input
terminals for either signal or
transient filtering.
RX can provide over-current
transient protection by limiting
input current during a transient
condition. For monitoring con-
tacts of a relay or switch, the
HCPL-3700/3760 in combination
with RX and RP can be used to
allow a specific current to be
conducted through the contacts
for cleaning purposes (wetting
current).
Conversely, if the denominator of
equation (2) is negative, then
V+
V-
VTH+
VTH-
V+ - VTH+ ITH+
and >
≤
V- - VTH-
ITH-
VTH- (V+) - VTH+ (V-)
RX =
(2)
ITH+ (VTH-) - ITH- (VTH+
)
Either ac (Pins 1, 4) or dc
(Pins 2, 3) input can be used to
determine external threshold
levels.
The choice of which input voltage
clamp level to choose depends
upon the application of this
device (see Figure 1). It is recom-
mended that the low clamp
VTH- (V+) - VTH+ (V-)
RP =
(3)
ITH+(V--VTH-)+ITH-(VTH+-V+)
condition be used when possible.
1-360
相关型号：
HCPL-3760-300E
Logic IC Output Optocoupler, 1-Element, 3750V Isolation, 0.300 INCH, LEAD FREE, SURFACE MOUNT, DIP-8
AGILENT
HCPL-3760-300E
1 CHANNEL LOGIC OUTPUT OPTOCOUPLER, 0.300 INCH, ROHS COMPLIANT, SURFACE MOUNT, DIP-8
AVAGO
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