illustrate

HCPL-0370 // 3700 and HCPL-3760 are voltage/current threshold detection optocouplers. The HCPL-3760 is A low-current version of the HCPL-0370//3700. To allow low current operation, the HCPL-3760 uses a high-efficiency LAGAAS LED that provides high light output drive current under the device using a threshold sensing input buffer ICS, allowing threshold control over a wide range of input voltages with a single input level external resistor input buffers contain multiple features: hysteresis for external noise immunity and switching immunity, a diode bridge for easy use of AC input signals, and an internal Clamp diodes to protect buffers and LEDs from a wide range of voltage overcurrents and current overcurrents. Because threshold sense is a prerequisite for driving LEDs, varying optical coupling from LED to LED detector has no effect on threshold levels.

feature

Standard (HCPL-0370/3700) and low input current (HCPL-3760) versions

AC or DC input

Programmable induced voltage

lag

Logic Compatible Output

Over-temperature guarantee threshold

Threshold independent of LED optical parameters

Certified according to UL 1577 and CSA

Dielectric resistance test voltage 3750 VAC, 1 minute

application

Limit switch sensing

Low Voltage Detector

AC mains and DC link voltage detection

relay contact monitor

Relay Coil Voltage Monitor

current sensing

Microprocessor interface

The input buffer ICs of the HCPL-0370/3700 have a nominal turn-on threshold of 2.5 mA (ITH+), 3.7 volts (VTH+). The buffer IC of the HCPL-3760 has been redesigned to allow lower input current. The nominal turn-on threshold of the HCPL-3760 is 1.2 mA (ITH+), 3.7 volts (VTH+). The high-gain output stage features an open-collector output that provides TTL-compatible saturation voltage and CMOS-compatible breakdown voltage. By combining several unique features in one package, it provides users with an ideal component for industrial control computer tablet and other applications requiring predetermined input threshold levels.

notes:

Time from 25°C to max temp = max 8 minutes. Maximum temperature=200°C, Minimum temperature=150°C

IEC/EN/DIN EN 60747-5-5 (with option 060)

Maximum working insulation voltage VIORM=567vpeak for HCPL-0370, 630 V peak for HCPL3700/3760. Maximum allowable overvoltage VIOTM=6000 V peak HCPL-0370/3700/3760. The Action Unit is certified according to UL 1577 Component Identification Procedure, File E55361 (HCPL-0370 Pending). CSA Corporation approves document CA 88324 under the CSA Parts Acceptance Order.

IEC/EN/DIN EN 60747-5-5 Insulation related characteristics [1] (with option 060)

notes:

1. Insulation characteristics are guaranteed only within the safe maximum ratings, which must be guaranteed by protection within the protective circuit. Application.

2. The safety limit parameter depends on the case temperature. Input current, i.e., input, drops linearly above 25°C free air packet temperature for HCPL-0370 and HCPL-3700/3760 at rates of 1.2 mA/°C and 1.53 mA/°C, respectively; output power PS at 25°C The above linear drop is 4.8 mW/°C and 4 mW/°C for HCPL-0370 and HCPL-3700/3760, respectively.

notes:

1. Measured 1.6 mm below the seat plane.

2. Current input/output of any one wire.

3. When the pulse repetition frequency is 120hz, the duration of the surge input current is 3ms. The transient input current duration was 10 μs at 120 Hz pulse repetition rate. Note that the maximum input power PIN must be observed.

4. Linearly reduce the free air temperature above 70°C at rates of 4.1 mW/°C (HCPL-3700/3760) and 3.1 mW/°C (HCPL-0370). Maximum input power of 230 mW (HCPL-3700/3760) and losses of 172 mW (HCPL-0370) allow an input IC junction temperature of 125°C at ambient temperature TA=70°C. Too many pins and TJs can cause IC chip degradation.

5. Linearly reduce the free air temperature above 70°C at rates of 5.4 mW/°C (HCPL-3700/3760) and 5 mW/°C (HCPL-0370).

6. Linearly reduce the free air temperature above 70°C at rates of 3.9 mW/°C (HCPL-3700/3760) and 1.9 mW/°C (HCPL-0370). The maximum output power dissipation of 210 mW (HCPL-3700/3760) and 103 mW (HCPL-0370) allows the output IC junction temperature to be 125°C at ambient temperature TA=70°C.

7. Linearly reduce the free air temperature above 70°C at a rate of 0.6 mA/degree Celsius.

8. The maximum operating frequency is defined when the output waveform pin 6 only gets VCC with 90% of RL. = 4.7 kΩ, centerline = 30 pF, input signal using 5 V square waveform.

9. Unless otherwise noted, all typical values are TA=25°C, VCC=5.0V.

10.tPHL propagation delay is from the 2.5V level (1 microsecond rise time) of the leading edge of the 5.0V input pulse to the leading edge of the output pulse (see Figure 10).

11.tPLH propagation delay is measured from the 2.5V level (1 microsecond fall time) of the trailing edge of the 5.0V input pulse to the trailing edge of the output pulse (see Figure 10).

12. Common mode transient immunity in logic high is the maximum tolerable (positive) DVCM/dt of the common leading edge. mode pulse, VCM, to ensure that the output will remain at a logic high state (ie, VO > 2.0V). The logic low common mode transient immunity level is the maximum tolerable (negative) DVCM/dt on the trailing edge of the common mode pulse signal (VCM) to ensure that the output will remain in a logic low state (ie, VO < 0.8v). See Figure 11.

13. In applications where dVCM/dt may exceed 50000 V/µs (eg electrostatic discharge), a series resistor RCC should be included to protect the detector IC from damaging high surge currents. The recommended value for RCC is 240y of allowable voltage drop per volt of VCC (at pin 8 and VCC) with a minimum of 240y.

14. In the range of VINžVTH+ and VIN>VTH (once VIN exceeds VTH+), a logic low output level on pin 6 occurs. Logic High When the VIN drops below the Vehicle Identification Number (VTH), the output level at pin 6 will appear at the VTH and VIN (VTH)

15. AC voltage is an instantaneous voltage.

16. A device that is considered a double-ended device: pins 1, 2, 3, 4 are connected together and pins 5, 6, 7, 8 are connected together.

17. According to UL 1577, each optocoupler is proof tested by applying insulation test voltage ≥4500 V rms for 1 second (leakage detection current limit, Ii-o≤5μA).

18. According to UL 1577, each optocoupler is proof tested by applying insulation test voltage ≥6000 V rms for 1 second (leakage detection current limit, Ii-o≤5μA). This test is carried out before the partial discharge 100% production test (method b) shown in IEC/EN/DIN EN 60747-5-5 Insulation Characteristics Table.

Electrical Considerations

The HCPL-0370/3700/3760 optocouplers feature internal temperature compensation, predictable voltage and current threshold points, and allow selection of an external resistor, RX, for larger external threshold voltage levels. For the desired external threshold voltage, the corresponding typical values of V±, RX can be obtained from Fig. The specific calculation of RX can be obtained from equation (1). Specifications for V+ and V-voltage can be simultaneously achieved by the use of RX and RP as shown in Figure 13, by equations (2) and (3). The receiver can provide overcurrent transient protection by limiting the input current during transient conditions. For monitoring contacts of relays or switches, the HCPL-0370/3700/3760 in combination with RX and RP can be used to allow a specific current to pass through the cleaning contacts (wetting current). Which input voltage clamp level is selected depends on the application of the device (see Figure 1). It is recommended that the low-clamp state be used whenever possible. Low clamp state and low clamp state input current characteristics will ensure extremely low input power consumption. In applications where dVCM/dt can be very large (such as electrostatic discharge), a series resistor, RCC, should be placed in series with VCC and pin 8 to protect the detector IC from damaging high surge currents. See Note 13 on the determination of RCC. Additionally, a 0.01µF ceramic disc bypass capacitor is recommended between pins 8 and 5 to reduce power supply noise.

For connecting AC signals to TTL systems, output low pass filtering can be done with 1.5kW and 20µF capacitors. This application requires Schmitt-triggered gates to avoid slow rise time chatter issues. For AC input applications, filter capacitors can be placed for signal or transient filtering. The ac (pins 1, 4) or dc (pins 2, 3) inputs can be used to determine external threshold levels. For a specific choice of external threshold voltage V+ or V level-, the receiver can pass without RP determination

For two specifically chosen external threshold voltage levels, V+ and V-, the use of RX and RP will allow selection by equations (2), (3), provided the following conditions are met. If the denominator of equation (2) is positive, then

Conversely, if equation (2) is negative, then