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ACPL-K376 Schematic ( PDF Datasheet ) - AVAGO

Teilenummer ACPL-K376
Beschreibung Isolated Voltage/Current Detector
Hersteller AVAGO
Logo AVAGO Logo 




Gesamt 13 Seiten
ACPL-K376 Datasheet, Funktion
ACPL-K370, ACPL-K376
Isolated Voltage/Current Detector
Data Sheet
Description
The ACPL-K370 and ACPL-K376 are voltage/current
threshold detection optocouplers. The ACPL-K376 is a low-
current version of the ACPL-K370. To obtain lower current
operation, the ACPL-K376 uses a high-efficiency AlGaAs
LED which has higher light output at lower drive currents.
Both devices have a threshold sensing input buffer IC
that allows threshold levels to be set by a single external
resistor over a wide range of input voltages.
The input buffer has several performance enhancing
features: hysteresis for extra noise immunity and
switching immunity, a diode bridge for easy use with AC
input signals, and internal clamping diodes to protect the
buffer and LED from over-voltage and over-current tran-
sients. Because threshold sensing is done prior to driving
the LED, variations in optical coupling from the LED to the
detector will not effect the threshold levels.
The ACPL-K370 input buffer IC has a nominal turn-on
threshold of 3.8 V(VTH+) and 2.77 mA (ITH+). The buffer
IC for the ACPL-K376 is designed for lower input current.
The nominal turn-on threshold for the ACPL-K376 is 3.8 V
(VTH+) and 1.32 mA (ITH+), which reduces power dissipa-
tion by 52%.
The high-gain output stage features an open-collector
output for both TTL compatible saturation voltages and
CMOS compatible breakdown voltages.
By combining many unique functions in a single package, the
ACPL-K370 and ACPL-K376 are ideal components for indus-
trial control computer input boards and other applications
where a predetermined input threshold level is needed.
Features
x ± 5% voltage detection accuracy
x Wide AC or DC detection range: up to 1140 Vpeak
x User configurable single/dual detection levels
x Built-in hysteresis improves noise immunity
x Very low threshold current: 1.32 mA (ACPL-K376)
x Logic compatible output
x Wide output supply voltage: 2 V to 18 V
x –40°C to +105°C operating temperature range
x SSO-8 package with 8 mm creepage and clearance
x Safety and regulatory approval:
– IEC/EN/DIN EN 60747-5-5: 1140 Vpeak working
insulation voltage
– UL 1577: 5000 Vrms/1minute double protection
rating
– CSA: Component Acceptance Notice #5
Applications
x Limit switch sensing
x Low voltage detector
x AC mains and DC-link voltage detection
x Relay contact monitor
x Relay coil voltage monitor
x Current sensing
x Microprocessor interfacing
x Telephone ring detection
Functional Diagram
Connection Diagram
AC1 1
D1
DC+ 2
D3
DC 3
D2
D4
AC2 4
Figure 1. Functional Diagram
ICC
8 VCC
7 NC
IO 6 VO
TRUTH TABLE
(POSITIVE LOGIC)
5 GND
INPUT OUTPUT
HL
LH
AC/DC
POWER
ISOLATION BARRIER
RX
ACPL-K370
GND1 ACPL-K376
Figure 2. Connection Diagram
GND2
CONTROLLER






ACPL-K376 Datasheet, Funktion
Table 6. Electrical Specifications
Unless otherwise noted, TA = –40°C to +105°C and VCC = 3 V to 5.5 V.
Parameter
Upper Threshold
Voltage, DC Input
(Pins 2, 3)
Lower Threshold
Voltage, DC Input
(Pins 2, 3)
Upper Threshold
Voltage, AC Input
(Pins 1, 4)
Lower Threshold
Voltage, AC Input
(Pins 1, 4)
Upper Threshold
Current
Sym.
VTH+
VTH–
VTH+
VTH–
ITH+
Device
Min
3.6
(–5%)
3.35
2.45
(–5%)
2.01
4.7
(–6%)
4.23
3.57
(–6%)
2.87
ACPL-K370 2.26
1.96
Typ[1]
3.8
2.59
5
3.8
2.77
Max
4
(+5%)
4.05
2.72
(+5%)
2.96
5.3
(+6%)
5.5
4.03
(+6%)
4.42
2.99
3.11
Units Test Conditions/Notes
V TA = 25°C, VIN = VDC+ – VDC–;
AC1 and AC2 open
V VIN = VDC+ – VDC–; AC1 and AC2 open
V TA = 25°C, VIN = VDC+ – VDC–;
AC1 and AC2 open
V VIN = VDC+ – VDC–; AC1 and AC2 open
V TA = 25°C, VIN = VAC1 – VAC2,
DC+ and DC– open; Note 2
V VIN = VAC1 – VAC2, DC+ and DC– open
V TA = 25°C, VIN = VAC1 – VAC2,
DC+ and DC– open
V VIN = VAC1 – VAC2, DC+ and DC– open
mA TA = 25°C
mA
Fig.
5, 6
5, 6
5, 6
5, 6
5, 6
5, 6
5, 6
5, 6
5, 6
5, 6
Upper Threshold
Current
ITH+ ACPL-K376 1.03 1.32 1.46 mA TA = 25°C
0.87 1.56 mA
5, 6
5, 6
Lower Threshold
Current
ITH– ACPL-K370 1.09 1.44 1.59 mA TA = 25°C
1 1.62 mA
5, 6
5, 6
Lower Threshold
Current
ITH– ACPL-K376 0.48 0.68 0.77 mA TA = 25°C
0.43 0.8 mA
5, 6
5, 6
Current Hysteresis
IHYS ACPL-K370
ACPL-K376
1.2
0.6
mA IHYS = ITH+ – ITH–
mA
5
Voltage Hysteresis
Input Clamp Voltage
Input Current
Input Current
Bridge Diode
Forward Voltage
Logic Low Output
Voltage
Logic High Output
Current
Logic Low Supply
Current
VHYS
VIHC1
5.4
VIHC2
6.1
VIHC3
VILC
IIN
IIN
VD1,2
VD3,4
VOL
ACPL-K370 3.2
ACPL-K376 1.5
ACPL-K370
ACPL-K376
ACPL-K370
ACPL-K376
IOH
ICCL ACPL-K370
ACPL-K376
1.2
6.1 6.8
6.8 7.4
12.5 13.4
–0.76
3.9
1.9
0.59
0.47
0.78
0.73
0.05
4.4
2.2
0.4
100
0.9 4
0.5 3
V VHYS = VTH+ – VTH–
5
V VIHC1 = VDC+ – VDC–, IIN = 10 mA,
AC1 & AC2 connected to DC–
4
V VIHC2 = |VAC1 – VAC2|, |IIN| = 10 mA,
DC+ and DC– open
4
V VIHC3 = VDC+ – VDC–, IIN = 15 mA,
AC1 & AC2 open
4
V VILC = VDC+ – VDC–, IIN = –10 mA
mA VDC+ – VDC– = 5 V, AC1 and AC2 open 8
mA VDC+ – VDC– = 5 V, AC1 and AC2 open 8
V IIN = 3 mA
V IIN = 1.5 mA
V IIN = 3 mA
V IIN = 1.5 mA
V VCC = 4.5 V, IOL = 4.2 mA; Note 3
8
PA VOH = VCC = 18 V; Note 4
mA VDC+ – VDC– = 5 V, VO open
mA
9
Logic High Supply
Current
ICCH
0.002 4
PA VCC = 18 V, VO open
7
Input Capacitance
CIN
50 pF f = 1 MHz, VIN = 0 V
Notes:
1. All typical values are at TA = 25°C unless otherwise stated.
2. AC voltage is instantaneous voltage.
3. A 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+.
4. A 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–.
6

6 Page









ACPL-K376 pdf, datenblatt
Electrical Considerations
The ACPL-K370/K376 optocouplers have internally tem-
perature compensated, predictable voltage and current
threshold points. This allows a single external resistor, RX,
to determine larger external threshold voltage levels. For
a desired external threshold voltage, V±, the approximate
Rx value is shown in Figure 12. Equation 1 can be used to
calculate Rx.
V+ and Vvoltage threshold levels can be simultaneously
set with two resistors, RX and RP, as shown in Figure 13 and
determined by Equations 4 and 5.
RX can provide over-current transient protection by
limiting input current during a transient condition. For
monitoring contacts of a relay or switch, the ACPL-K370/
K376 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).
The choice of which input voltage clamp level to choose
depends upon the application of this device (see Figure 4).
It is recommended that the low clamp condition be used
when possible. The low clamp condition in conjunction
with the low input current feature will ensure extremely
low input power dissipation.
In applications where dVCM/dt may be extremely large
(such as with a static discharge), a series resistor, RCC,
should be connected in series with VCC and pin 8 to protect
the detector IC from destructive high surge currents. The
recommended value for RCC is 240 : per volt of allowable
drop in VCC (between Pin 8 and VCC) with a minimum value
of 240 :. In addition, it is recommended that a ceramic
disc bypass capacitor of 0.01 PF be placed between pins 5
and 8 to reduce the effect of power supply noise.
For interfacing ac signals to TTL systems, output low pass
filtering can be performed with a pull-up resistor of 1.5 k:
and 20 PF capacitor. This application requires a Schmitt
trigger gate to avoid slow rise time chatter problems.
For AC input applications, a filter capacitor can be placed
across the DC input terminals for either signal or transient
filtering.
ISOLATION
BARRIER
RX ITH±
1 AC1
VCC 8
VCC
V±
VTH± 2 DC+
NC 7
RL
RP
3 DC
VO 6
VO
4 AC2
GND 5
CL
Either AC (pins 1 and 4) or DC (pins 2 and 3) input can be
used to determine external threshold levels. For single
specifically selected external threshold voltage level V+ or
V, RX can be determined without use of RP via:
V+(–) – VTH+(–)
RX =
ITH+(–)
Equation 1
For dual specifically selected external threshold voltage
levels, V+ and V, the use of RX and RP will permit this
selection. Two equations can be written:
VTH+
V+ = Rx ( ITH+ +
) + VTH+
RP
Equation 2
VTH–
V= Rx ( ITH– +
) + VTH–
RP
Equation 3
Solving these equations for RX and RP yields the following
two expressions:
VTH– (V+) – VTH+ (V)
RX =
ITH+ (VTH–) – ITH– (VTH+)
Equation 4
VTH– (V+) – VTH+ (V)
RP =
ITH+ (V– VTH–) + ITH– (VTH+ – V+)
Equation 5
where
V+ and Vare the desired external voltage threshold
levels, and values for VTH± and ITH± are found from the
data sheet.
Equations 4 and 5 are valid only if the conditions of
Equations 6 or 7 are met. With the VTH± and ITH± values,
the denominator of Equation 4 is checked to see if it is
positive or negative. If it is positive, then the following
ratios must be met:
V+ VTH+ and V+ – VTH+ < ITH+
V– VTH–
V– VTH– ITH–
Equation 6
Conversely, if the denominator of Equation 4 is negative,
then the following ratios must hold:
V+ VTH+ and V+ – VTH+ > ITH+
V– VTH–
V– VTH– ITH–
Equation 7
Refer to Application Note 1004 for more application infor-
mation and worked out examples.
Figure 13. External threshold voltage level selection.
GND
12

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