HCPL-070A-500E

Data Sheet HCPL-4701/-4731/-070A/-073A Very Low Power Consumption High-Gain Optocouplers Description These Broadcom® devices are very low power consumption, high-gain, single- and dual-channel optocouplers. The HCPL4701 represents the single-channel, 8-pin DIP configuration and is pin compatible with the industry-standard 6N139. The HCPL-4731 represents the dual-channel 8-pin DIP configuration and is pin compatible with the popular standard HCPL-2731. The HCPL-070A and HCPL-073A are the equivalent single- and dual-channel products in an SO-8 footprint. Each channel can be driven with an input current as low as 40 μA and has a typical current transfer ratio of 3500%. These high-gain couplers use an AlGaAs LED and an integrated high-gain photodetector to provide an extremely high current transfer ratio between input and output. Separate pins for the photodiode and output stage results in TTL compatible saturation voltages and high-speed operation. Where desired, the VCC and VO terminals can be tied together to achieve conventional Darlington operation (single-channel package only). These devices are designed for use in CMOS, LSTTL, or other low power applications. They are especially well suited for ISDN telephone interface and battery-operated applications due to the low power consumption. A 700% minimum current transfer ratio is guaranteed from 0°C to 70°C operating temperature range at 40 μA of LED current and VCC ≥ 3V. The SO-8 does not require through holes in a PCB. This package occupies approximately one-third the footprint area of the standard dual-in-line package. The lead profile is designed to be compatible with standard surface-mount processes. CAUTION! Take normal static precautions in the handling and assembly of this component to prevent damage, degradation, or both that might be induced by ESD. The components featured in this data sheet are not to be used in military or aerospace applications or environments. Broadcom Features           Ultra low input current capability: 40 μA Specified for 3V operation – Typical power consumption: 2.0V). Common transient immunity in a Logic Low level is the maximum tolerable (negative) dVCM/dt on the trailing edge of the common mode pulse, VCM, to ensure that the output will remain in a Logic Low state (i.e., VO < 0.8V). e. In applications where dV/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 is RCC = 220Ω. Broadcom AV01-0547EN 10 HCPL-4701/-4731/-070A/-073A Data Sheet Very Low Power Consumption High-Gain Optocouplers Package Characteristics Parameter Input-Output Momentary Withstand Voltageb Symbol Device HCPL- VISO Option 020 4701, 4731 Min. Typ.a Max. Unit Test Conditions 3750 — — Vrms RH ≤ 50%, t = 1 min., TA = 25°C 5000 — — Fig. Note c, d c, e Resistance (Input-Output) RI-O — 1012 — Ω VI-O = 500 VDC, RH ≤ 45% c Capacitance (Input-Output) CI-O — 0.6 — pF f = 1 MHz c Insulation Leakage Current (Input-Input) II-I — 0.005 — μA RH ≤ 45%, t = 5s, VI-I = 500 VDC f Resistance (Input-Input) RI-I — 1011 — Ω Capacitance (Input-Input) CI-I 4731 — 0.03 — pF f = 1 MHz f 073A — 0.25 — 4731, 073A a. All typical values at TA = 25°C and VCC = 5V, unless otherwise noted. b. 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 IEC/EN/DIN EN 60747-5-5 Insulation Characteristics Table (if applicable), your equipment level safety specification. c. Device considered a two-terminal device: pins 1, 2, 3, and 4 shorted together, and pins 5, 6, 7, and 8 shorted together. d. In accordance with UL 1577, each optocoupler is proof-tested by applying an insulation test voltage ≥4500 Vrms for 1 second (leakage detection current limit, II-O ≤ 5 μA). e. In accordance with UL 1577, each optocoupler is proof-tested by applying an insulation test voltage ≥6000 Vrms for 1 second (leakage detection current limit, II-O ≤ 5 μA). This test is performed before the 100% production test for partial discharge (Method b) shown in the IEC/ EN/DIN EN 60747-5-5 Insulation Characteristics Table. f. Measured between pins 1 and 2 shorted together, and pins 3 and 4 shorted together. Broadcom AV01-0547EN 11 HCPL-4701/-4731/-070A/-073A Data Sheet Very Low Power Consumption High-Gain Optocouplers Figure 1: DC Transfer Characteristics (IF = 0.5 mA to 2.5 mA) Figure 2: DC Transfer Characteristics (IF = 50 μA to 250 μA) 7 TA = 25°C VCC = 5 V 24 21 IF IF 0m = 2. IF m = 1.5 18 A A 15 IF = 12 A 1.0 m I F = 0.5 m 9 A 6 3 0 0 6 IF = 200 μA IF = 150 μA 5 4 IF = 100 μA 3 IF = 50 μA 2 1 0 2.0 1.0 0 1.0 2.0 VO – OUTPUT VOLTAGE – V VO – OUTPUT VOLTAGE – V Figure 3: Current Transfer Ratio vs. Forward Current Figure 4: Output Current vs. Input Diode Forward Current 9 1.25 1.0 25°C 70°C NORMALIZED IF = 40 μA VO = 0.4 V VCC = 5 V IO – OUTPUT CURRENT – mA NORMALIZED CURRENT TRANSFER RATIO IF = 250 μA TA = 25°C VCC = 5 V mA 5 = 2. IO – OUTPUT CURRENT – mA IO – OUTPUT CURRENT – mA 27 0.75 0°C 0.5 0.25 0.1 10 1.0 Figure 5: Input Diode Forward Current vs. Forward Voltage + VF – 1.0 0.1 0.01 0.8 0.9 1.0 1.1 1.2 1.3 1.4 VF – FORWARD VOLTAGE Broadcom 0°C 6 5 4 3 2 1 0 0.2 0.1 0.3 0.4 0.5 Figure 6: Propagation Delay vs. Temperature IP – PROPAGATION DELAY – μs IF – FORWARD CURRENT – mA TA = 25°C IF 10 70°C IF – INPUT DIODE FORWARD CURRENT – mA IF – FORWARD CURRENT – mA 100 25°C 7 0 0 0.01 VO = 0.4 V VCC = 5 V 8 1.5 70 IF = 0.5 mA RL = 4.7 kΩ 60 50 tPLH 40 30 20 tPHL 10 0 0 10 20 30 40 50 60 70 TA – TEMPERATURE – °C AV01-0547EN 12 HCPL-4701/-4731/-070A/-073A Data Sheet Very Low Power Consumption High-Gain Optocouplers Figure 7: Test Circuit for Transient Immunity and Typical Waveforms VCM 10 V 90% 90% 10% 0V IF 8 RCC (SEE NOTE) +5 V 220 Ω 2 7 0.1 μF 3 6 4 5 B 10% tr 1 tf RL A VO 5V SWITCH AT A: IF = 0 mA VO VO VFF VCM + – VOL SWITCH AT B: IF = 0.5 mA PULSE GEN. NOTE: In applications where dV/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 is RCC = 220Ω. Figure 8: Switching Test Circuit IF 0 5V VO (SATURATED RESPONSE) t PHL 1.5 V 1.5 V PULSE GEN. ZO = 50 Ω t r = 5 ns IF 10% DUTY CYCLE 1/f < 100 μs 1 8 2 7 3 6 VOL t PLH +5 V RL VO 0.1 μF I F MONITOR 4 5 * CL = 15 pF RM * CL IS APPROXIMATELY 15 pF, WHICH INCLUDES PROBE AND STRAY WIRING CAPACITANCE. Broadcom AV01-0547EN 13 HCPL-4701/-4731/-070A/-073A Data Sheet Very Low Power Consumption High-Gain Optocouplers Applications Information Typically, the HCPL-47XX can control a total output and supply current of 15 mA. The output current, IO, is determined by the LED forward current multiplied by the current gain of the optocoupler, IO = IF (CTR)/100%. In particular with the HCPL-47XX optocouplers, the LED can be driven with a very small IF of 40 μA to control a maximum IO of 320 μA with a worst-case design Current Transfer Ratio (CTR) of 800%. Typically, the CTR and the corresponding IOL are four times larger. Low-Power Operation Current Gain There are many applications where low-power isolation is needed and can be provided by the single-channel HCPL4701, or the dual-channel HCPL-4731 low-power optocouplers. Either or both of these two devices are referred to in this text as HCPL- 47XX product(s). For low-power operation, Table 1 lists the typical power dissipations that occur for both the 3.3 Vdc and 5 Vdc HCPL-47XX optocoupler applications. These approximate power dissipation values are listed respectively for the LED, for the output VCC and for the open-collector output transistor. Those values are summed together for a comparison of total power dissipation consumed in either the 3.3 Vdc or 5 Vdc applications. These optocouplers are Broadcom’s lowest input current, low-power optocouplers. Low-power isolation can be defined as less than a milliwatt of input power needed to operate the LED of an optocoupler (generally less than 500 μA). This level of input forward current conducting through the LED can control a worst-case total output (IOL) and power supply current (ICCL) of two and a half milliamperes. Table 1: Typical HCPL-4701 Power Dissipation for 3V and 5V Applications VCC = 3.3 Vdc VCC = 5 Vdc Power Dissipation (μW) IF = 40 μA IF = 500 μA IF = 40 μA IF = 500 μA PLED 50 625 50 625 PVcc 65 330 100 500 PO-Ca 20 10 25 20 PTOTALb 135 μW 965 μW 175 μW 1,145 μW a. RL of 11 kΩ open-collector (o-c) pull-up resistor was used for both 3.3 Vdc and 5 Vdc calculations. b. For typical total interface circuit power consumption in 3.3 Vdc application, add to PTOTAL approximately 80 μW for 40 μA (1,025 μW for 500 μA) LED current-limiting resistor, and 960 μW for the 11 kΩ pull-up resistor power dissipations. Similarly, for 5 Vdc applications, add to PTOTAL approximately 150 μW for 40 μA (1,875 μW for 500 μA) LED current-limiting resistor and 2,230 μW for the 11 kΩ pull-up resistor power dissipations. Broadcom AV01-0547EN 14 HCPL-4701/-4731/-070A/-073A Data Sheet Very Low Power Consumption High-Gain Optocouplers Propagation Delay Telephone Line Interfaces When the HCPL-47XX optocoupler is operated under very low input and output current conditions, the propagation delay times will lengthen. When lower input drive current level is used to switch the high-efficiency AlGaAs LED, the slower the charge and discharge time will be for the LED.Correspondingly, the propagation delay times will become longer as a result. In addition, the split-Darlington (open-collector) output amplifier needs a larger, pull-up load resistance to ensure the output current is within a controllable range. Applications where the HCPL-47XX optocoupler would be best used are in telephone line interface circuitry for functions of ring detection, on-off hook detection, line polarity, line presence and supplied-power sensing. In particular, Integrated Services Digital Network (ISDN) applications, as illustrated in Figure 9, can severely restrict the input power that an optocoupler interface circuit can use (approximately 3 mW). Figure 9 shows three isolated signals that can be served by the small input LED current of the HCPL-47XX dual- and single-channel optocouplers. Very low, total power dissipation occurs with these series of devices. Applications that are not sensitive to longer propagation delay times and that are easily served by this HCPL-47XX optocoupler, typically 65 μs or greater, are those of status monitoring of a telephone line, power line, battery condition of a portable unit, and so on. For faster HCPL-47XX propagation delay times, approximately 30 μs, this optocoupler needs to operate at higher IF (≥500 μA) and IO (≥1 mA) levels. Battery-Operated Equipment Common applications for the HCPL-47XX optocoupler are within battery-operated, portable equipment, such as test or medical instruments, computer peripherals, and accessories where energy conservation is required to maximize battery life. In these applications, the optocoupler would monitor the battery voltage and provide an isolated output to another electrical system to indicate battery status or the need to switch to a backup supply or begin a safe shutdown of the equipment via a communication port. In addition, the HCPL-47XX optocouplers are specified to operate with 3 Vdc CMOS logic family of devices to provide logic-signal isolation between similar or different logic circuit families. Broadcom Switched-Mode Power Supplies Within Switched-Mode Power Supplies (SMPS) the less power consumed the better. Isolation for monitoring line power, regulation status, for use within a feedback path between primary and secondary circuits or to external circuits are common applications for optocouplers. Lowpower HCPL-47XX optocoupler can help keep higher energy conversion efficiency for the SMPS. Figure 11 shows where low-power isolation can be used. AV01-0547EN 15 HCPL-4701/-4731/-070A/-073A Data Sheet Very Low Power Consumption High-Gain Optocouplers Figure 9: HCPL-47XX Isolated Monitoring Circuits for 2-Wire ISDN Telephone Line TELEPHONE LINE ISOLATION BARRIER RECEIVE 2-WIRE ISDN LINE PROTECTION CIRCUIT TRANSMIT LINE POLARITY HCPL-4731 PRIMARY–SECONDARY POWER ISOLATION BARRIER LINE PRESENCE TELEPHONE LINE INTERFACE CIRCUIT SECONDARY/ EMERGENCY POWER HCPL-4701 EMERGENCY POWER SWITCHED– MODE SECONDARY VAC PRIMARY P0WER SUPPLY VCC POWER VCC – RETURN POWER SUPPLY NOTE: THE CIRCUITS SHOWN IN THIS FIGURE REPRESENT POSSIBLE, FUNCTIONAL APPLICATION OF THE HCPL-47XX OPTOCOUPLER TO AN ISDN LINE INTERFACE. THIS CIRCUIT ARRANGEMENT DOES NOT GUARANTEE COMPLIANCE, CONFORMITY, OR ACCEPTANCE TO AN ISDN, OR OTHER TELECOMMUNICATION STANDARD, OR TO FCC OR TO OTHER GOVERNMENTAL REGULATORY AGENCY REQUIREMENTS. THESE CIRCUITS ARE RECOMMENDATIONS THAT MAY MEET THE NEEDS OF THESE APPLICATIONS. Agilent DOES NOT IMPLY, REPRESENT, NOR GUARANTEE THAT THESE CIRCUIT ARRANGEMENTS ARE FREE FROM PATENT INFRINGEMENT. Figure 10: Typical Optical Isolation Used for Power-Loss Indication and Regulation Signal Feedback ISOLATION BARRIER 115/230 VAC EMI FILTER AND CURRENT LIMITER RECTIFIER AND FILTER SWITCHING ELEMENT 1 CONTROL CIRCUIT VO 2 GND 2 ERROR FEEDBACK VIA CNR200 SOFT START COMMAND POWER SUPPLY FILTER CAPACITOR 1 HCPL-4701 INTERRUPT FLAG POWER DOWN 2 1 Figure 11: Recommended Power Supply Filter for HCPL-47XX Optocouplers RECOMMENDED VCC FILTER 100 Ω 8 1 7 2 6 3 4 0.1 μF + 10 μF VCC RL VO 5 HCPL-4701 OR HCPL-4731 Broadcom AV01-0547EN 16 HCPL-4701/-4731/-070A/-073A Data Sheet Data Communication and Input/Output Interfaces In data communication, the HCPL-47XX can be used as a line receiver on a RS-232-C line or this optocoupler can be part of a proprietary data link with low input current, multi-drop stations along the data path. Also, this low-power optocoupler can be used within equipment that monitors the presence of high- voltage. For example, a benefit of the low input LED current (40 μA) helps the input sections of a Programmable Logic Controller (PLC) monitor proximity and limit switches. The PLC I/O sections can benefit from low input current optocouplers because the total input power dissipation when monitoring the high voltage (120 Vac to 220 Vac) inputs is minimized at the I/O connections. This is especially important when many input channels are stacked together. Circuit Design Issues Power Supply Filtering Since the HCPL-47XX is a high- gain, split-Darlington amplifier, any conducted electrical noise on the VCC power supply to this optocoupler should be minimized. A recommended VCC filter circuit is shown in Figure 11 to improve the power supply rejection (psr) of the optocoupler. The filter should be located near the combination of pin 8 and pin 5 to provide best filtering action. This filter will drastically limit any sudden rate of change of VCC with time to a slower rate that cannot interfere with the optocoupler. Common-Mode Rejection and LED Driver Circuits With the combination of a high-efficiency AlGaAs LED and a high-gain amplifier in the HCPL-47XX optocoupler, a few circuit techniques can enhance the common-mode rejection (CMR) of this optocoupler. First, use good high-frequency circuit layout practices to minimize coupling of common-mode signals between input and output circuits. Keep input traces away from output traces to minimize capacitive coupling of interference between input and output sections. If possible, parallel, or shunt switch the LED current as shown in Figure 12, rather than series switch the LED current as illustrated in Figure 14. Not only will CMR be enhanced with these circuits (Figure 12 and Figure 13), but the switching speed of the optocoupler will be improved as well. This is because in the parallel switched case the LED current is current-steered into or away from the LED, rather than being fully turned off as in the series switched case. Figure 12 illustrates this type of circuit. The Schottky diode helps quickly to discharge and pre-bias the LED in the off state. If a common-mode voltage across the optocoupler suddenly Broadcom Very Low Power Consumption High-Gain Optocouplers attempts to inject a current into the off LED anode, the Schottky diode would divert the interfering current to ground. The combination of the Schottky diode forward voltage and the Vol saturation voltage of the driver output stage (oncondition) will keep the LED voltage at or below 0.8V. This will prevent the LED (off-condition) from conducting any significant forward current that might cause the HCPL-47XX to turn on. Also, if the driver stage is an active totem-pole output, the Schottky diode allows the active output pull-up section to disconnect from the LED and pull high. As shown in Figure 13, most active output driver integrated circuits can source directly the forward current needed to operate the LED of the HCPL-47XX optocoupler. The advantage of using the silicon diode in this circuit is to conduct charge out of the LED quickly when the LED is turned off. Upon turn-on of the LED, the silicon diode capacitance will provide a rapid charging path (peaking current) for the LED. In addition, this silicon diode prevents common-mode current from entering the LED anode when the driver IC is on and no operating LED current exists. In general, series switching the low input current of the HCPL47XX LED is not recommended. This is particularly valid when in a high common-mode interference environment. However, if series switching of the LED current must be done, use an additional pull-up resistor from the cathode of the LED to the input VCC as shown in Figure 15. This helps minimize any differential-mode current from conducting in the LED while the LED is off, due to a common-mode signal occurring on the input VCC (anode) of the LED. The common-mode signal coupling to the anode and cathode could be slightly different. This could potentially create a LED current to flow that would rival the normal, low input current needed to operate the optocoupler. This additional parallel resistor can help shunt any leakage current around the LED should the drive circuit, in the off state, have any significant leakage current on the order of 40 μA. With the use of this parallel resistor, the total drive current conducted when the LED is on is the sum of the parallel resistor and LED currents. In the series circuit of Figure 15 with the LED off, if a common-mode voltage were to couple to the LED cathode, there can be enough imbalance of common-mode voltage across the LED to cause a LED current to flow and, inadvertently, turn on the optocoupler. This series, switching circuit has no protection against a negative-transition, input common-mode signal. AV01-0547EN 17 HCPL-4701/-4731/-070A/-073A Data Sheet Very Low Power Consumption High-Gain Optocouplers Figure 12: Recommended Parallel LED Driver Circuit for HCPL-4701/-4731 VCC + 4.7 μF Figure 13: Recommended Alternative LED Driver Circuit for HCPL-4701/-4731L – VF V R1 = CC IF 0.1 μF R1 R1 = FOR VCC = 5 Vdc, IF = 40 μA R1 = 91 kΩ (TYPICAL) R1 = 75 kΩ (WORST CASE) * VOH – VF IF FOR VCC = 5 Vdc, IF = 40 μA R1 = 36 kΩ (TYPICAL) R1 = 30 kΩ (WORST CASE) R1 * HCPL-47XX ACTIVE OUTPUT OR OPEN COLLECTOR HCPL-47XX ACTIVE OUTPUT * USE ANY SIGNAL DIODE. * USE ANY STANDARD SCHOTTKY DIODE. R1 = VCC – VF – VOL IF R2 = 0.8 V IOH MAX TOTAL DRIVE CURRENT USED: – VF – VOL V – VOL V ITOTAL = CC + CC R1 R2 VCC + 4.7 μF 0.1 μF R1 FOR VCC = 5 Vdc, IF = 40 μA R1 = 82 kΩ (TYPICAL) R1 = 62 kΩ (WORST CASE) R2 = 8.2 kΩ AT IOH = 100 μA ITOTAL = 640 μA (TYPICAL) R2 HCPL-47XX ACTIVE OUTPUT OR OPEN COLLECTOR Broadcom Figure 15: Thermal Derating Curve, Dependence of Safety Limiting Value with Case Temperature per VDE 0884 OUTPUT POWER – PS, INPUT CURRENT – IS Figure 14: Series LED Driver Circuit for HCPL-4701/-4731 800 PS (mW) 700 IS (mA) 600 500 400 300 200 100 0 0 25 50 75 100 125 150 175 200 TS – CASE TEMPERATURE – °C AV01-0547EN 18 Copyright © 2007–2022 Broadcom. All Rights Reserved. The term “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. For more information, go to www.broadcom.com. All trademarks, trade names, service marks, and logos referenced herein belong to their respective companies. Broadcom reserves the right to make changes without further notice to any products or data herein to improve reliability, function, or design. Information furnished by Broadcom is believed to be accurate and reliable. However, Broadcom does not assume any liability arising out of the application or use of this information, nor the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. .