ACPL-K370, ACPL-K376 Isolated Voltage/Current Detector Data Sheet Description Features The ACPL-K370 and ACPL-K376 are voltage/current threshold detection optocouplers. The ACPL-K376 is a lowcurrent 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. x ± 5% voltage detection accuracy 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 transients. 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(V TH+) 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 (V TH+) and 1.32 mA (ITH+), which reduces power dissipation by 52%. 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 (pending): – 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 The high-gain output stage features an open-collector output for both TTL compatible saturation voltages and CMOS compatible breakdown voltages. x AC mains and DC-link voltage detection By combining many unique functions in a single package, the ACPL-K370 and ACPL-K376 are ideal components for industrial control computer input boards and other applications where a predetermined input threshold level is needed. x Current sensing Functional Diagram Connection Diagram D1 x Telephone ring detection D2 RX 7 NC D3 x Microprocessor interfacing 8 VCC DC+ 2 DC 3 x Relay coil voltage monitor ISOLATION BARRIER ICC AC1 1 x Relay contact monitor D4 AC2 4 Figure 1. Functional Diagram IO 6 VO 5 GND AC/DC POWER TRUTH TABLE (POSITIVE LOGIC) INPUT OUTPUT H L L H CONTROLLER GND1 Figure 2. Connection Diagram ACPL-K370 ACPL-K376 GND2 Table 1. Ordering Information The ACPL-K370 and ACPL-K376 are UL recognized with 5000 Vrms for 1 minute per UL1577 (pending). Option Part number RoHS Compliant Package Surface Mount Quantity X -000E -060E ACPL-K370 ACPL-K376 IEC/EN/ DIN EN 60747-5-2 Tape & Reel Stretched SO-8 -500E -560E 80 per tube X X X X X X 80 per tube 1000 per reel X 1000 per reel To form a complete ordering part number, choose a part number from the part number column and combine it with the desired option from the option column. Example 1: ACPL-K370-560E orders an RoHS compliant part with an IEC/EN/DIN EN 60747-5-5 certification and Tape & Reel packaging. Package Outline Drawings Stretched SO-8 Package (SSO-8) RECOMMENDED LAND PATTERN 5.850 ± 0.50 (0.230 ± 0.010) PART NUMBER 8 7 6 5 K370 Z YYWW Z = OPTION CODE [1] RoHS-COMPLIANCE INDICATOR DATE CODE 12.650 (0.5) 6.807 ± 0.127 (0.268 ± 0.005) 1.905 (0.1) 1 2 3 4 7° 45° 1.590 ± 0.127 (0.063 ± 0.005) 0.450 (0.018) 3.180 ± 0.127 (0.125 ± 0.005) 0.750 ± 0.250 (0.0295 ± 0.010) 0.381 ± 0.130 (0.015 ± 0.005) 1.270 (0.050) BSG Note 1. “V” = Options comprise 060; other options are not marked. Figure 3. 2 0.200 ± 0.100 (0.008 ± 0.004) 11.50 ± 0.250 (0.453 ± 0.010) Dimensions in millimeters and (inches). Lead coplanarity = 0.1 mm (0.004 inches). Recommended Lead-Free IR Soldering Profile The recommended reflow soldering profile is per JEDEC Standard J-STD-020 (latest revision). Non-halide flux should be used. Regulatory Information The ACPL-K370/K376 is pending aaproval by the following organizations: IEC/EN/DIN EN 60747-5-5 (with option 060) Approved with a maximum working insulation voltage of VIORM = 1140 Vpeak, and with a highest allowable overvoltage of VIOTM = 8000 Vpeak. UL Approval under the UL 1577 component recognition program up to VISO = 5000 VRMS / 1 minute. File E55361. CSA Approval under CSA Component Acceptance Notice #5, File CA 88324. Table 2. Insulation Related Specifications Parameter Symbol Value Units Conditions Minimum External Air Gap (Clearance) L(IO1) 8 mm L(IO1) Minimum External Tracking Path (Creepage) L(IO2) 8 mm Measured from input terminals to output terminals 0.08 mm Through insulation distance conductor to conductor 175 V DIN IEC 112/VDE 0303 Part 1 Minimum Internal Plastic Gap (Clearance) Tracking Resistance Isolation Group (per DIN VDE 0109) 3 CTI IIIa Material Group DIN VDE 0109 Table 3. IEC/EN/DIN EN 60747-5-5 Insulation Related Characteristics [1] (with option 060) Description Symbol Characteristic Installation Classification per DIN VDE 0110/1.89, Table 1: for rated mains voltage ≤ 300 Vrms for rated mains voltage ≤ 450 Vrms for rated mains voltage ≤ 600 Vrms for rated mains voltage ≤ 1000 Vrms I-IV I-III I-III I-II Climatic Classification 55/105/21 Pollution Degree (DIN VDE 0110/1.89) 2 Units Maximum Working Insulation Voltage VIORM 1140 Vpeak Input to Output Test Voltage, Method b VIORM x 1.875 = VPR, 100% Production Test with tm = 1 second, Partial Discharge < 5 pC VPR 2137 Vpeak Input to Output Test Voltage, Method a VIORM x 1.6 = VPR, Type and sample test, tm = 10 seconds, Partial Discharge < 5 pC VPR 1824 Vpeak Highest Allowable Overvoltage (Transient overvoltage, tini = 60 seconds) VIOTM 8000 Vpeak Safety Limiting Values (Maximum values allowed in the event of a failure) Case Temperature Input Current [2] Output Power [2] TS IS,INPUT PS,OUTPUT 175 230 600 °C mA mW Insulation Resistance at TS, VIO = 500 V RS 109 : Notes: 1. Insulation characteristics are guaranteed only within the safety maximum ratings, which must be ensured by protective circuits within the application. 2. Safety-limiting parameters are dependent on case temperature. The input current, IS,INPUT, should be derated linearly above 25°C free-air case temperature at a rate of 1.53 mA / °C; the Output Power, PS,OUTPUT, should be derated linearly above 25°C free-air case temperature at a rate of 4 mW / °C. 4 Table 4. Absolute Maximum Ratings Parameter Symbol Min Max Units Storage Temperature TS –55 125 °C Operating Temperature TA –40 105 °C Input Current, Average IIN 50 mA 1 Input Current, Surge IIN 140 mA 1, 2 Input Current, Transient IIN 500 mA 1, 2 Input Voltage (Pins 2-3) VIN –0.5 Note V Input Power Dissipation PIN 200 mW 3 Total Package Power Dissipation PT 269 mW 4 Output Power Dissipation PO 163 mW 5 Output Current, Average IO 30 mA 6 Supply Voltage (Pins 8-5) VCC –0.5 20 V Output Voltage (Pins 6-5) VO –0.5 20 V Lead Solder Temperature 260°C for 10 seconds, measured at 1.6 mm below seating plane. Notes: 1. Current into or out of any single lead. 2. Surge input current duration is 3 ms at a 120 Hz pulse repetition rate. Transient input current duration is 10 μs at a 120 Hz pulse repetition rate. Note that the maximum input power, PIN, must be observed. 3. Derate linearly above 105°C free-air temperature at a rate of 10 mW / °C. The maximum input power dissipation of 200 mW allows an input IC junction temperature of 125°C at an ambient temperature of TA = 105°C. Excessive PIN and TJ may result in IC chip degradation. 4. Derate linearly above 105°C free-air temperature at a rate of 13.5 mW / °C. 5. Derate linearly above 105°C free-air temperature at a rate of 8.2 mW / °C. A maximum output power dissipation of 163 mW allows an output IC junction temperature of 125°C at an ambient temperature of TA = 105°C. 6. Derate linearly above 105°C free-air temperature at a rate of 1.5 mA / °C. Table 5. Recommended Operating Conditions Parameter Symbol Min Max Units Note Supply Voltage VCC 2 18 V Operating Temperature TA –40 105 °C Operating Frequency, VCC = 5 V f 0 9 kHz 1 Operating Frequency, VCC = 3.3 V f 0 5 kHz 1 Notes: 1. Maximum operating frequency is defined when the output waveform at pin 6 obtains only 90% of VCC with RL = 4.7 k:, CL = 30 pF using a 5 V square wave input signal. 5 Table 6. Electrical Specifications Unless otherwise noted, TA = –40°C to +105°C and VCC = 3 V to 5.5 V. Min Typ[1] Max Units Test Conditions/Notes Fig. V TH+ 3.6 (–5%) 3.35 3.8 4 (+5%) 4.05 V 5, 6 Lower Threshold Voltage, DC Input (Pins 2, 3) V TH– 2.45 (–5%) 2.01 2.59 2.72 (+5%) 2.96 V Upper Threshold Voltage, AC Input (Pins 1, 4) V TH+ 4.7 (–6%) 4.23 5 5.3 (+6%) 5.5 V Lower Threshold Voltage, AC Input (Pins 1, 4) V TH– 3.57 (–6%) 2.87 3.8 4.03 (+6%) 4.42 V Upper Threshold Current ITH+ ACPL-K370 2.26 Upper Threshold Current ITH+ ACPL-K376 1.03 Lower Threshold Current ITH– ACPL-K370 1.09 Lower Threshold Current ITH– ACPL-K376 0.48 Current Hysteresis IHYS ACPL-K370 Voltage Hysteresis VHYS Input Clamp Voltage VIHC1 5.4 6.1 VIHC2 6.1 Parameter Sym. Upper Threshold Voltage, DC Input (Pins 2, 3) Device 2.77 1.96 1.32 0.87 1.44 1 0.68 0.43 V V TA = 25°C, VIN = VDC+ – VDC–; AC1 and AC2 open VIN = VDC+ – VDC–; AC1 and AC2 open TA = 25°C, VIN = VAC1 – VAC2, DC+ and DC– open; Note 2 VIN = VAC1 – VAC2, DC+ and DC– open 5, 6 5, 6 5, 6 5, 6 5, 6 V TA = 25°C, VIN = VAC1 – VAC2, DC+ and DC– open VIN = VAC1 – VAC2, DC+ and DC– open 5, 6 2.99 mA TA = 25°C 5, 6 3.11 mA 1.46 mA 1.56 mA 1.59 mA 1.62 mA 0.77 mA 0.8 mA 1.2 ACPL-K376 V TA = 25°C, VIN = VDC+ – VDC–; AC1 and AC2 open VIN = VDC+ – VDC–; AC1 and AC2 open mA 5, 6 5, 6 TA = 25°C 5, 6 5, 6 TA = 25°C 5, 6 5, 6 TA = 25°C 5, 6 5, 6 IHYS = ITH+ – ITH– 5 0.6 mA 1.2 V VHYS = V TH+ – V TH– 5 6.8 V 4 6.8 7.4 V VIHC3 12.5 13.4 V VILC –0.76 V VIHC1 = VDC+ – VDC–, IIN = 10 mA, AC1 & AC2 connected to DC– VIHC2 = |VAC1 – VAC2|, |IIN| = 10 mA, DC+ and DC– open VIHC3 = VDC+ – VDC–, IIN = 15 mA, AC1 & AC2 open VILC = VDC+ – VDC–, IIN = –10 mA 4 4 Input Current IIN ACPL-K370 3.2 3.9 4.4 mA VDC+ – VDC– = 5 V, AC1 and AC2 open 8 Input Current IIN ACPL-K376 1.5 1.9 2.2 mA VDC+ – VDC– = 5 V, AC1 and AC2 open 8 Bridge Diode Forward Voltage VD1,2 ACPL-K370 0.59 V IIN = 3 mA ACPL-K376 0.47 V IIN = 1.5 mA ACPL-K370 0.78 V IIN = 3 mA VD3,4 V IIN = 1.5 mA 0.4 V VCC = 4.5 V, IOL = 4.2 mA; Note 3 100 PA VOH = VCC = 18 V; Note 4 0.9 0.5 4 3 mA mA VDC+ – VDC– = 5 V, VO open 9 ICCH 0.002 4 PA VCC = 18 V, VO open 7 CIN 50 pF f = 1 MHz, VIN = 0 V ACPL-K376 Logic Low Output Voltage Logic High Output Current Logic Low Supply Current Logic High Supply Current Input Capacitance 0.73 0.05 VOL IOH ICCL ACPL-K370 ACPL-K376 8 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 ≥ V TH+ as well as the range of VIN > V TH– once VIN has exceeded V TH+. 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 Table 7. Switching Specifications Unless otherwise noted, TA = –40°C to +105°C. Parameter Typ[1] Max Units Test Conditions/Notes Fig. ACPL-K370 3.7 7.5 Ps RL = 4.7 k:, CL = 30 pF; Note 2 10 ACPL-K376 6.2 12.5 Ps ACPL-K370 3.7 7.5 Ps ACPL-K376 6.3 12.5 Ps ACPL-K370 13.8 70 Ps ACPL-K376 13.3 70 Ps ACPL-K370 8.5 45 Ps ACPL-K376 6.4 45 Ps 25 Sym Device tPHL Min VCC = 4.5 V Propagation Delay Time to Logic Low at Output Propagation Delay Time to Logic High at Output tPLH Ps RL = 1.8 k:, CL = 15 pF; Note 2 RL = 4.7 k:, CL = 30 pF; Note 3 10 RL = 1.8 k:, CL = 15 pF; Note 3 Output Rise Time (10-90%) tR ACPL-K370 RL = 4.7 k:, CL = 30 pF 11 ACPL-K376 24 Ps Output Fall Time (90-10%) tF ACPL-K370 0.3 Ps RL = 4.7 k:, CL = 30 pF 11 ACPL-K376 0.4 Ps ACPL-K370 4 7.5 Ps ACPL-K376 6.8 12.5 Ps ACPL-K370 4 7.5 Ps ACPL-K376 6.9 12.5 Ps ACPL-K370 19 90 Ps ACPL-K376 18.5 90 Ps ACPL-K370 12.8 70 Ps ACPL-K376 12.5 70 Ps ACPL-K370 27 Ps ACPL-K376 26 Ps ACPL-K370 0.3 Ps ACPL-K376 0.5 Ps 10 kV/Ps IIN = 0 mA, RL = 4.7 k:, VO,MIN = 2 V, VCM = 1500 V; Notes 4, 5 ACPL-K370 1 kV/Ps IIN = 3.11 mA, RL = 4.7 k:, VO,MAX = 0.8 V, VCM = 500 V; Notes 4, 5 ACPL-K376 1 kV/Ps IIN = 1.56 mA, RL = 4.7 k:, VO,MAX = 0.8 V, VCM = 500 V; Notes 4, 5 VCC = 3.3 V Propagation Delay Time to Logic Low at Output Propagation Delay Time to Logic High at Output tPHL tPLH Output Rise Time (10-90%) tR Output Fall Time (90-10%) tF RL = 4.7 k:, CL = 30 pF; Note 2 RL = 1.8 k:, CL = 15 pF; Note 2 RL = 4.7 k:, CL = 30 pF; Note 3 RL = 1.8 k:, CL = 15 pF; Note 3 RL = 4.7 k:, CL = 30 pF RL = 4.7 k:, CL= 30 pF VCC = 3 V to 5.5 V Common Mode Transient Immunity at Logic High Output |CMH| Common Mode Transient Immunity at Logic Low Output |CML| Notes: 1. All typical values are at TA = 25°C unless otherwise stated. 2. The tPHL propagation delay is measured from the 2.5 V level of the leading edge of a 5.0 V input pulse (1 Ps rise time) to the 1.5 V level on the leading edge of the output pulse. CL includes probe and stray wiring capacitance. 3. The tPLH propagation delay is measured from the 2.5 V level of the trailing edge of a 5.0 V input pulse (1 Ps fall time) to the 1.5 V level on the trailing edge of the output pulse. CL includes probe and stray wiring capacitance. 4. Common mode transient immunity with a 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). 5. In applications where dVCM/dt may exceed 50 kV / μs (such as when a static discharge occurs), a series resistor, RCC, should be included 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 :. 7 Table 8. Package Characteristics Over recommended temperature range of TA = –40°C to 105°C unless otherwise specified. Parameter Symbol Min Input-Output Momentary Withstand Voltage VISO 5000 Input-Output Resistance RI-O Input-Output Capacitance CI-O Typ Max Units Test Conditions Vrms RH ≤ 50%, t = 1 min; TA = 25°C; Notes 1 to 3 1012 : VI-O = 500 Vdc; Note 2 0.6 pF f = 1 MHz, VI-O = 0 Vdc; Note 2 Notes: 1. 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, or Avago Application Note 1074, Optocoupler Input-Output Endurance Voltage. 2. Device considered a two terminal device: pins 1, 2, 3, 4 connected together, and pins 5, 6, 7, 8 connected together. 3. 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 PA). 8 Typical Performance Plots IIN - INPUT CURRENT - mA Unless otherwise noted, TA = 25°C. 50 45 40 35 30 25 20 15 10 5 0 AC INPUT, PINS 2, 3 OPEN DC INPUT, SHORT PINS 1 & 2, SHORT PINS 3 & 4. DC INPUT, PINS 1, 4 OPEN 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 VIN - INPUT VOLTAGE - V Figure 4. Typical input characteristics IIN vs. VIN (AC voltage is an instantaneous value). 6 VCC = 5 V RL = 4.7 kΩ VO - OUTPUT VOLTAGE - V 5 4 3 Input Signal Device 2 ITH ACPL-K370 2.77mA 1.44mA ACPL-K376 1.32mA 0.68mA 1 0 THINPUT SIGNAL (a) TH+ TH– Input Connection PINS 2, 3 OR 1, 4 VTH(DC) ALL 3.8V 2.59V PINS 2, 3 VTH(AC) ALL 5V 3.8V PINS 1, 4 TH+ (b) VTH+ ITH+ VTH– ITH– -40 -20 0 20 40 60 TA - TEMPERATURE - °C 80 3.3 3.1 2.9 2.7 2.5 2.3 2.1 1.9 1.7 1.5 1.3 1.1 0.9 100 120 4.2 4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2 2 1.8 -60 Figure 6. Typical DC threshold levels vs. temperature for (a) ACPL-K370, and (b) ACPL-K376. 9 ACPL-K376 VTH+ ITH+ VTH– ITH– -40 -20 0 20 40 60 TA - TEMPERATURE - °C 80 1.6 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 100 120 ITH - THRESHOLD CURRENT -mA ACPL-K370 VTH - THRESHOLD VOLTAGE - V 4.2 4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 2.2 2 1.8 -60 ITH - THRESHOLD CURRENT -mA VTH - THRESHOLD VOLTAGE - V Figure 5. (a) Typical transfer characteristics, and (b) Input threshold levels. ICCH - HIGH LEVEL SUPPLY CURRENT - PA 1E+0 1E-1 1E-2 1E-3 1E-4 1E-5 -60 -40 -20 0 20 40 60 TA - TEMPERATURE - °C 80 100 120 IIN VDC+ – VDC– = 5V, AC1 AND AC2 OPEN -40 -20 0 20 40 60 TA - TEMPERATURE - °C (a) 110 100 90 80 70 60 50 40 VOL VCC = 4.5V, 30 IOL = 4.2mA 20 10 80 100 120 2.4 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 -60 ACPL-K376 -40 -20 110 100 90 80 70 60 50 VOL 40 VCC = 4.5V, 30 IOL = 4.2mA 20 10 0 20 40 60 80 100 120 TA - TEMPERATURE - °C (b) VOL - LOW OUTPUT VOLTAGE - mV ACPL-K370 IIN - INPUT CURRENT - mA 4.4 4.2 4 3.8 3.6 3.4 3.2 3 2.8 2.6 2.4 -60 VOL - LOW OUTPUT VOLTAGE - mV IIN - INPUT CURRENT - mA Figure 7. Typical high level supply current, ICCH vs. temperature. ACPL-K370 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 ICCL - LOGIC LOW SUPPLY CURRENT - mA ICCL - LOGIC LOW SUPPLY CURRENT - mA Figure 8. Typical input current, IIN, and low level output voltage, VOL vs. temperature for (a) ACPL-K370 and (b) ACPL-K376. 0 2 4 6 8 10 12 VCC - SUPPLY VOLTAGE - V (a) 14 16 18 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 ACPL-K376 0 Figure 9. Typical logic low supply current vs. supply voltage for (a) ACPL-K370 and (b) ACPL-K376. 10 2 4 6 8 10 12 VCC - SUPPLY VOLTAGE - V (b) 14 16 18 ACPL-K370 RL = 4.7k:, CL = 30pF, VCC = 4.5V 35 30 25 tPLH 20 15 10 tPHL 5 0 -60 -40 -20 ACPL-K376 40 tP - PROPAGATION DELAY - Ps tP - PROPAGATION DELAY - Ps 40 0 20 40 60 TA - TEMPERATURE - °C (a) 80 100 RL = 4.7k:, CL = 30pF, VCC = 4.5V 35 30 20 15 10 tPHL 5 0 -60 120 tPLH 25 -40 -20 0 20 40 60 TA - TEMPERATURE - °C (b) 80 100 120 Figure 10. Typical propagation delay vs. temperature for (a) ACPL-K370 and (b) ACPL-K376. 60 tR 800 70 700 60 600 50 500 40 tF 30 400 300 20 tR - RISE TIME - Ps tR - RISE TIME - Ps 70 tF - Fall Time - ns RL = 4.7k:, CL = 30pF, VCC = 4.5V 200 10 0 -60 -40 -20 0 20 40 60 TA - TEMPERATURE - °C (a) 80 ACPL-K376 80 900 900 800 tR 50 40 700 600 tF 30 500 20 400 10 300 0 -60 100 100 120 1000 RL = 4.7k:, CL = 30pF, VCC = 4.5V -40 -20 0 20 40 60 TA - TEMPERATURE - °C (b) 80 tF - Fall Time - ns ACPL-K370 80 200 100 120 ACPL-K370 300 V+(AC) 250 V–(AC) V+(DC) V–(DC) 200 150 DC: VTH+ = 3.8V, VTH– = 2.59V; AC: VTH+ = 5V, VTH– = 3.8V; ITH+ = 2.77mA, ITH– = 1.44mA (AC VOLTAGE IS INSTANTANEOUS VALUE) 100 50 0 0 40 80 120 160 200 RX - EXTERNAL SERIES RESISTOR - k: (a) 240 V± - EXTERNAL THRESHOLD VOLTAGE - V V± - EXTERNAL THRESHOLD VOLTAGE - V Figure 11. Typical rise, fall times vs. temperature for (a) ACPL-K370,and (b) ACPL-K376. ACPL-K376 300 V+(AC) 250 V+(DC) 200 V–(DC) 150 DC: VTH+ = 3.8V, VTH– = 2.59V; AC: VTH+ = 5V, VTH– = 3.8V; ITH+ = 1.32mA, ITH– = 0.68mA (AC VOLTAGE IS INSTANTANEOUS VALUE) 100 50 0 0 Figure 12. Typical external threshold characteristics, V± vs. RX for (a) ACPL-K370 and (b) ACPL-K376. 11 V–(AC) 100 200 300 400 RX - EXTERNAL SERIES RESISTOR - k: (b) 500 Electrical Considerations The ACPL-K370/K376 optocouplers have internally temperature 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. 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+ and V– voltage threshold levels can be simultaneously set with two resistors, RX and RP, as shown in Figure 13 and determined by Equations 4 and 5. 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: 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. Equation 1 ITH+(–) V+ = Rx ( ITH+ + V– = Rx ( ITH– + V TH+ RP V TH– RP ) + V TH+ Equation 2 ) + V TH– Equation 3 Solving these equations for RX and RP yields the following two expressions: RX = V TH– (V+) – V TH+ (V–) ITH+ (V TH–) – ITH– (V TH+) V TH– (V+) – V TH+ (V–) RP = ITH+ (V– – V TH–) + ITH– (V TH+ – V+) Equation 4 Equation 5 where V+ and V– are the desired external voltage threshold levels, and values for V TH± 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 V TH± 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+ ≥ V– V TH+ and V TH– V+ – V TH+ < V– – V TH– ITH+ ITH– Equation 6 ITH± 1 AC1 V± VTH± RP VCC 8 2 DC+ NC 7 3 DC– VO 6 4 AC2 GND 5 VCC RL Figure 13. External threshold voltage level selection. V+ V– VO CL GND 12 V+(–) – V TH+(–) Conversely, if the denominator of Equation 4 is negative, then the following ratios must hold: ISOLATION BARRIER RX RX = ≤ V TH+ V TH– and V+ – V TH+ V– – V TH– > ITH+ Equation 7 ITH– Refer to Application Note 1004 for more application information and worked out examples. For product information and a complete list of distributors, please go to our web site: www.avagotech.com Avago, Avago Technologies, the A logo and R2Coupler™ are trademarks of Avago Technologies in the United States and other countries. Data subject to change. Copyright © 2005-2009 Avago Technologies. All rights reserved. AV02-2153EN - September 23, 2009