Avago Technologies ACPL-224-500E - Manual (Page 62)

AV02-4387EN 59 Avago Technologies
Description
The HCPL-3700/60 Threshold-
Sensing Optocoupler can be used
for sensing the ac/dc power on/off
condition. At the optocoupler input,
only a pair of series resistors R
X
/2 are
required to limit the current. The ac
signal can be filtered with a capaci-
tor at either the input or the output
of the optocoupler. For more infor-
mation refer to Avago Applica tion
Note AN 1004, “Threshold Sensing
for Industrial Control Systems.” The
value of R
X
determines the threshold
sensing voltage.
Performance of Circuit
• HCPL­3760 optocoupler threshold
input current: 1.3 mA (typical)
• Typical optocoupler propaga tion
delay: 10 µs
• Optocoupler common mode tran-
sient immunity: 600 V/µs (typical)
• Maximum input voltage: up to
1000 Vdc, or 800 Vac
Benefits
• HCPL 3700/60’s built­in diode
bridge and hysteresis circuit re-
duces component count
• HCPL­3760’s low threshold sens-
ing current reduces power dissi-
pation
• Threshold voltage can be adjust-
ed by external resistor R
X
References
1) Avago Application Note AN 1004,
“Threshold Sensing for Industrial
Control Systems”
2) HCPL-3700/60 Threshold Sensing
Optocoupler Technical Data
Alternative Avago Parts
HCPL-576X: Hermetically Sealed
Threshold Sensing Optocoupler
AC/DC Voltage Threshold Sensing
Industrial Applications
VOUT
HCPL-3700/60
RL
RX/2
VCC
1
2
3
4
8
7
6
5
RX/2
UP TO
800 Vac
AC INPUT CONFIGURATION
VOUT
HCPL-3700/60
RL
RX/2
VCC
AC
DC+
DC-
AC
VCC
VO
GND
UP TO
1000 Vdc
DC INPUT CONFIGURATION
RX/2
5
ICC
GND
6
VO
8
VCC
3
2
1
4
DC+ INPUT
AC
INPUT
DC– INPUT
IO
HCPL-3700/60 SCHEMATIC
D1 D2
D3 D4
1
2
3
4
8
7
6
5
AC
DC+
DC-
AC
VCC
VO
GND