ACPL-W70L-500E

ACPL-W70L-000E and ACPL-K73L-000E Single-channel and Dual-channel High Speed 15 MBd CMOS optocoupler with Glitch-Free Power-Up Feature Data Sheet Lead (Pb) Free RoHS 6 fully compliant RoHS 6 fully compliant options available; -xxxE denotes a lead-free product Description Features The ACPL-W70L (single-channel) and ACPL-K73L (dualchannel) are 15 MBd CMOS optocouplers in SSOIC-6 and SSOIC-8 package respectively. The optocouplers utilize the latest CMOS IC technology to achieve outstanding performance with very low power consumption. Basic building blocks of ACPL-W70L and ACPL-K73L are high speed LEDs and CMOS detector ICs. Each detector incorporates an integrated photodiode, a high speed transimpedance amplifier, and a voltage comparator with an output driver. • +3.3V and 5 V CMOS compatibility • 25ns max. pulse width distortion • 55ns max. propagation delay • 40ns max. propagation delay skew • High speed: 15 MBd min • 10 kV/µs minimum common mode rejection • –40 to 105°C temperature range • Glitch-Free Power-UP Feature Component Image • Safety and regulatory approvals: ACPL-W70L 6 VDD Anode 1 - UL recognized: 5000 V rms for 1 min. per UL 1577 - CSA component acceptance Notice #5 - IEC/EN/DIN EN 60747-5-2 approved Option 060 5 Vo NC* 2 Applications • Digital field bus isolation: Cathode 3 4 GND SHIELD - CANBus, RS485, USB • Multiplexed data transmission • Computer peripheral interface ACPL-K73L Anode1 1 8 VDD 7 Vo 1 • Microprocessor system interface • DC/DC converter Cathode1 2 Cathode2 3 6 Vo 2 Anode2 4 5 GND SHIELD TRUTH TABLE LED OFF ON VO, OUTPUT L H A 0.1µF bypass capacitor must be connected between pins 4 and 6 for ACPL-W70L and pins 5 and 8 for ACPL-K73L. CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by ESD. Ordering Information ACPL-W70L and ACPL-K73L will be UL Recognized with 5000 Vrms for 1 minute per UL1577. Option Part number RoHS Compliant Package Surface Mount ACPL-W70L -000E SSO-6 X ACPL-K73L -500E X -060E X -560E X -000E SSO-8 Gull Wing Tape& Reel X X X -500E X -060E X -560E X X X UL 5000 Vrms/ 1 Minute rating IEC/EN/DIN EN 60747-5-2 Quantity X 100 per tube X 1000 per reel X X 100 per tube X X 1000 per reel X 80 per tube X 1000 per reel X X 80 per tube X X 1000 per reel To order, choose a part number from the part number column and combine with the desired option from the option column to form an order entry. Example 1: ACPL-W70L-500E to order product of stretched SO-6 package in Tape and Reel packaging in RoHS compliant. Option datasheets are available. Contact your Avago sales representative or authorized distributor for information. 2 Package Dimensions ACPL-W70L (Stretched SO-6 Package) LAND PATTERN RECOMMENDATION 12.65 (0.498) 1.27 (0.050) BSG 0.381 0.127 (0.015 0.005) 1 6 2 5 3 4 +0.127 6.807 0 (0.268 +0.005) - 0.000 0.45 (0.018) 7 45 +0.254 4.580 0 +0.010 (0.180 ) - 0.000 0.76 (0.030) 1.91 (0.075) 1.590 0.127 (0.063 0.005) 7 3.180 0.127 (0.125 0.005) 0.20 0.10 (0.008 0.004) 0.750 0.250 (0.0295 0.010) DIMENSIONS IN MILLIMETERS (INCHES). LEAD COPLANARITY = 0.1 mm (0.004 INCHES). 11.50 0.250 (0.453 0.010) ACPL-K73L (Stretched S0-8 Package) LAND PATTERN RECOMMENDATION 0.381 0.13 (0.015 0.005) 0.450 (0.018) 1 8 2 7 3 6 4 5 7 45 3 +0.25 5.850 0 +0.010 (0.230 ) - 0.000 1.905 (0.1) 1.590 0.127 (0.063 0.005) 7 3.180 0.127 (0.125 0.005) 0.200 0.100 (0.008 0.004) 0.750 0.250 (0.0295 0.010) 12.650 (0.5) 1.270 (0.050) BSG 6.807 0.127 (0.268 0.005) 11.5 0.250 (0.453 0.010) DIMENSIONS IN MILLIMETERS (INCHES). LEAD COPLANARITY = 0.1 mm (0.004 INCHES). Solder Reflow Thermal Profile 300 PREHEATING RATE 3°C + 1°C/–0.5°C/SEC. REFLOW HEATING RATE 2.5°C ± 0.5°C/SEC. 200 PEAK TEMP. 245°C PEAK TEMP. 240°C TEMPERATURE (°C) 2.5 C ± 0.5 °C/SEC. 30 SEC. 160°C 150°C 140°C SOLDERING TIME 200°C 30 SEC. 3°C + 1°C/–0.5°C 100 PREHEATING TIME 150°C, 90 + 30 SEC. 50 SEC. TIGHT TYPICAL LOOSE ROOM TEMPERATURE 0 50 0 100 150 Recommended Pb-Free IR Profile TIME WITHIN 5 °C of ACTUAL PEAK TEMPERATURE TEMPERATURE Tsmax Tsmin tp 20-40 SEC. RAMP-UP 3 °C/SEC. MAX. RAMP-DOWN 6 °C/SEC. MAX. ts PREHEAT 60 to 180 SEC. 25 tL 60 to 150 SEC. The ACPL-W70L and ACPL-K73L are approved by the following organizations: UL Recognized under UL 1577, component recognition program, File E55361. CSA Approved under CSA Component Acceptance Notice #5, File CA88324. IEC/EN/DIN EN 60747-5-2 Approval under: IEC 60747-5-2:1997 + A1:2002 t 25 °C to PEAK TIME Notes: The time from 25 °C to peak temperature = 8 minutes max. Tsmax = 200 °C, Tsmin = 150 °C Non-halide flux should be used 4 250 Regulatory Information 260 +0/-5 °C 150 - 200 °C 200 TIME (SECONDS) Note: Non-halide flux should be used. Tp 217 °C TL PEAK TEMP. 230°C EN 60747-5-2:2001 + A1:2002 DIN EN 60747-5-2 (VDE 0884Teil 2):2003-01 (Option 060 only) Parameter Symbol Value Units Conditions Minimum External Air Gap (Clearance) L(I01) 8.0 mm Measured from input terminals to output terminals, shortest distance through air. Minimum External Tracking (Creepage) L(I02) 8.0 mm Measured from input terminals to output terminals, shortest distance path along body. 0.08 mm Insulation thickness between emitter and detector; also known as distance through insulation. ≥175 Volts DIN IEC 112/VDE 0303 Part 1 Minimum Internal Plastic Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) CTI Isolation Group IIIa All Avago Technologies data sheets report the creepage and clearance inherent to the optocoupler component itself. These dimensions are needed as a starting point for the equipment designer when determining the circuit insulation requirements. However, once mounted on a printed circuit board, minimum creepage and clearance requirements must be met as specified for individual equipment standards. For creepage, the shortest distance Material Group (DIN VDE 0110, 1/89, Table 1) path along the surface of a printed circuit board between the solder fillets of the input and output leads must be considered. There are recommended techniques such as grooves and ribs which may be used on a printed circuit board to achieve desired creepage and clearances. Creepage and clearance distances will also change depending on factors such as pollution degree and insulation level. IEC/EN/DIN EN 60747-5-2 Insulation Characteristics* Description Symbol Option 060 Units Installation classification per DIN VDE 0110/1.89, Table 1 for rated mains voltage 150 Vrms 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 – III I – III Climatic Classification 55/105/21 Pollution Degree (DIN VDE 0110/1.89) 2 Maximum Working Insulation Voltage VIORM 1140 Vpeak Input to Output Test Voltage, Method b** VPR 2137 Vpeak Input to Output Test Voltage, Method a** VIORM x 1.5=VPR, Type and Sample Test, tm=60 sec, Partial discharge < 5 pC VPR 1710 Vpeak Highest Allowable Overvoltage (Transient Overvoltage tini = 10 sec) VIOTM 8000 Vpeak Safety-limiting values – maximum values allowed in the event of a failure, also see Figure 2. Case Temperature Input Current Output Power TS IS, INPUT PS, OUTPUT 175 230 600 °C mA mW Insulation Resistance at TS, VIO = 500 V RIO >109 W VIORM x 1.875=VPR, 100% Production Test with tm=1 sec, Partial discharge < 5 pC Note: * Isolation characteristics are guaranteed only within the safety maximum ratings which must be ensured by protective circuits in application. Surface mount classification is class A in accordance with CECCOO802. ** Refer to the optocoupler section of the Isolation and Control Components Designer’s Catalog, under Product Safety Regulations section IEC/EN/ DIN EN 60747-5-2, for a detailed description of Method a and Method b partial discharge test profiles. These optocouplers are suitable for “safe electrical isolation” only within the safety limit data. Maintenance of the safety data shall be ensured by means of protective circuits. The surface mount classification is Class A in accordance with CECC 00802. 5 Absolute Maximum Ratings Parameter Symbol Min. Max. Units Storage Temperature TS –55 +125 °C Ambient Operating Temperature TA –40 +105 °C Supply Voltages VDD 0 6 Volts Output Voltage VO –0.5 VDD +0.5 Volts Average Forward Input Current IF - 10 mA Average Output Current Io - 10 mA Lead Solder Temperature 260°C for 10 sec., 1.6 mm below seating plane Solder Reflow Temperature Profile See Solder Reflow Temperature Profile Section Recommended Operating Conditions Parameter Symbol Min. Max. Units Ambient Operating Temperature TA –40 +105 °C Supply Voltages VDD 4.5 5.5 V 3.0 3.6 V Input Current (ON) IF 4 8 mA Supply Voltage Slew Rate[1] SR 0.5 500 V/ms Electrical Specifications Over recommended temperature (TA = –40°C to +105°C), 3.0V≤VDD ≤ 3.6V and 4.5 V ≤VDD ≤ 5.5 V. All typical specifications are at TA=+25°C , VDD= +3.3V. Parameter Symbol Part Number Min. Typ. Max. Units Test Conditions 1.5 1.85 V IF = 6 mA V IR = 10 µA Input Forward Voltage VF 1.2 Input Reverse Breakdown Voltage BVR 5.0 Logic High Output Voltage VOH VDD-1 VDD-0.3 V IF = 6 mA, IO = -4 mA, VDD=3.3 V VDD-1 VDD-0.2 V IF = 6 mA, IO = -4 mA, VDD=5 V Logic Low Output Voltage VOL Input Threshold Current ITH Logic Low Output Supply Current IDDL Logic Low Output Supply Current IDDH 6 0.2 0.8 V IF = 0 mA, IO = 4 mA, VDD=3.3 V 0.2 0.8 V IF = 0 mA, IO = 4 mA, VDD=5 V 1 3 mA IOL = 20 µA ACPL-W70L 4.1 6.5 mA IF = 0 mA ACPL-K73L 8.2 13 mA IF = 0 mA ACPL-W70L 3.8 6 mA IF = 6 mA ACPL-K73L 7.6 12 mA IF = 6 mA Switching Specifications Over recommended temperature (TA = –40°C to +105°C), 3.0V≤VDD ≤ 3.6V and 4.5 V ≤VDD ≤ 5.5 V. All typical specifications are at TA=+25°C, VDD = +3.3V. Parameter Symbol Propagation Delay Time to Logic Low Output[2] Min. Typ. Max. Units Test Conditions tPHL 23 55 ns IF = 6 mA, CL= 15pF CMOS Signal Levels Propagation Delay Time to Logic High Output[2] tPLH 27 55 ns IF = 6 mA, CL= 15pF CMOS Signal Levels Pulse Width tPW 66.7 Pulse Width Distortion[3] |PWD| 0 Propagation Delay Skew[4] tPSK Output Rise Time (10% – 90%) tR Output Fall Time (90% - 10%) tF Common Mode Transient Immunity at Logic High Output[5] | CMH | Common Mode Transient Immunity at Logic Low Output[6] ns 4 25 ns IF = 6 mA, CL= 15pF CMOS Signal Levels 40 ns IF = 6 mA, CL= 15pF CMOS Signal Levels 3.5 ns IF = 6 mA, CL= 15pF CMOS Signal Levels 3.5 ns IF = 0 mA, CL= 15pF CMOS Signal Levels 10 15 kV/µs VCM = 1000 V, TA = 25°C, IF = 6 mA | CML | 10 15 kV/µs VCM = 1000 V, TA = 25°C, IF = 0 mA Parameter Symbol Min. Typ. Max. Units Test Conditions Input-Output Insulation II-O 1.0 µA 45% RH, t = 5 s VI-O = 3 kV DC, TA = 25°C Input-Output Momentary Withstand Voltage VISO Vrms RH ≤ 50%, t = 1 min., TA = 25°C Input-Output Resistance R I-O 10 12 W V I-O = 500 V dc Input-Output Capacitance C I-O 0.6 pF f = 1 MHz, TA = 25°C Package Characteristics All Typical at TA = 25°C. 5000 Notes: 1. Slew rate of supply voltage ramping is recommended to ensure no glitch more than 1V to appear at the output pin. 2. tPHL propagation delay is measured from the 50% level on the rising edge of the input pulse to the 50% level on the falling edge of the VO signal. tPLH propagation delay is measured from the 50% level on the falling edge of the input pulse to the 50% level on the rising edge of the VO signal. 3. PWD is defined as |tPHL - tPLH|. 4. tPSK is equal to the magnitude of the worst case difference in tPHL and/or tPLH that will be seen between units at any given temperature within the recommended operating conditions. 5. CMH is the maximum tolerable rate of rise of the common mode voltage to assure that the output will remain in a high logic state. 6. CML is the maximum tolerable rate of fall of the common mode voltage to assure that the output will remain in a low logic state. 7 1.600 10 Ith - INPUT THRESHOLD CURRENT-mA VF 0.1 0.01 I DDH -LOGIC HIGH OUTPUT SUPPLY CURRENT-mA tp – PROPAGATION DELAY; PWD-Pulse Width h Distortion – ns 1.4 1.5 VF - FORWARD VOLTAGE-V Figure 1. Typical input diode forward characteristic 12 35 1.2 1.3 1.6 10 8 6 4 VDD=5V VDD=3.3V 2 0 -40 20 40 60 80 100 T A -TEMPERATURE- oC Figure 3. Typical logic high output supply current vs. temperature for dual channel (ACPL-K73L) 30 -20 0 t PHL CH1 20 t PHL CH2 10 5 VDD=5V TA=25°C 0 5 4 t PLH CH1 |PWD| CH1 |PWD| CH2 6 7 8 IF – PULSE INPUT CURRENT – mA 9 10 Figure 5. Typical switching speed vs. pulse input current at 5V supply voltage 8 1.000 0.800 I OL =20uA 0.600 5V 3.3V 0.400 0.200 -40 -20 20 40 60 80 T A-TEMPERATURE- oC Figure 2. Typical input threshold current vs. temperature 0 100 120 12 10 8 6 4 VDD=5V VDD=3.3V 2 0 -40 -20 20 40 60 80 100 T A-TEMPERATURE- oC Figure 4. Typical logic low output supply current vs. temperature for dual channel (ACPL-K73L) 35 t PLH CH2 25 15 1.200 0.000 IDDL -LOGIC LOW OUTPUT SUPPLY CURRENT-mA TA=25°C 1 1.400 tp – PROPAGATION DELAY; PWD-Pulse Width Distortion – ns IF - FORWARD CURRENT-mA IF 0 t PLH CH2 30 t PHL CH1 25 20 15 t PLH CH1 t PHLCH2 10 5 VDD=5V TA=25°C 0 5 4 |PWD| CH1 |PWD| CH2 6 7 8 IF – PULSE INPUT CURRENT – mA 9 Figure 6. Typical switching speed vs. pulse input current at 3.3V supply voltage 10 1.8 V F FORWARD VOLTAGE-V 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 -40 -20 0 20 40 60 T A-TEMPERATURE- o C 80 100 Figure 7. Typical VF vs. temperature. Application Information Bypassing and PC Board Layout The ACPL-W70L and ACPL-K73L optocouplers are extremely easy to use. ACPL-W70L and ACPL-K73L provide CMOS logic output due to the high-speed CMOS IC technology used. The external components required for proper operation are the input limiting resistor and the output bypass capacitor. Capacitor values should be between 0.01 µF and 0.1 µF. For each capacitor, the total lead length between both ends of the capacitor and the power-supply pins should not exceed 20 mm. Propagation Delay, Pulse-Width Distortion and Propagation Delay Skew Propagation delay is a figure of merit which describes how quickly a logic signal propagates through a system. The propagation delay from low to high (tPLH) is the amount of time required for an input signal to propagate to the output, causing the output to change from low to high. Similarly, the propagation delay from high to low (tPHL) is the amount of time required for the input signal to propagate to the output, causing the output to change from high to low (see Figure 9). 9 Pulse-width distortion (PWD) results when tPLH and tPHL differ in value. PWD is defined as the difference between tPLH and tPHL and often PWD is defined as the difference between tPLH and tPHL and often determines the maximum data rate capability of a transmission system. PWD can be expressed in percent by dividing the PWD (in ns) by the minimum pulse width (in ns) being transmitted. Typically, PWD on the order of 20-30% of the minimum pulse width is tolerable; the exact figure depends on the particular application (RS232, RS422, T-1, etc.). Propagation delay skew, tPSK, is an important parameter to consider in parallel data applications where synchronization of signals on parallel data lines is a concern. If the parallel data is being sent through a group of optocouplers, differences in propagation delays will cause the data to arrive at the outputs of the optocouplers at different times. If this difference in propagation delays is large enough, it will determine the maximum rate at which parallel data can be sent through the optocouplers. Propagation delay skew is defined as the difference between the minimum and maximum propagation delays, either tPLH or tPHL, for any given group of optocouplers which are operating under the same conditions (i.e., the same supply voltage, output load, and operating temperature). As illustrated in Figure 10, if the inputs of a group of optocouplers are switched either ON or OFF at the same IF 1 3 C 5 4 Vo GND2 IF1 1 8 GND 1 2 7 GND 1 3 IF2 4 ACPL-W70L XXX YWW GND1 XXX YWW 2 V DD 6 VDD C VO1 VO2 6 5 GND 2 ACPL-K73L C=0.01µF to 0.1µF Figure 8. Recommended printed circuit board layout VI DATA 50% INPUTS 2.5 V, CMOS VO CLOCK tPSK VI 50% DATA OUTPUTS VO 2.5 V, CMOS tPSK CLOCK tPSK Figure 9. Propagation delay skew waveform Figure 10. Parallel data transmission example. time, tPSK is the difference between the shortest propagation delay, either tPHL or tPHL, and the longest propagation delay, either tPHL or tPHL. As mentioned earlier, tPSK can determine the maximum parallel data transmission rate. Figure 10 shows that there will be uncertainty in both the data and the clock lines. It is important that these two areas of uncertainty not overlap, otherwise the clock signal might arrive before all of the data outputs have settled, or some of the data outputs may start to change before the clock signal has arrived. Figure 10 is the timing diagram of a typical parallel data application with both the clock and the data lines being sent through optocouplers. The figure shows data and clock signals at the inputs and outputs of the optocouplers. To obtain the maximum data transmission rate, both edges of the clock signal are being used to clock the data; if only one edge were used, the clock signal would need to be twice as fast. Propagation delay skew represents the uncertainty of where an edge might be after being sent through an optocoupler. 10 From these considerations, the absolute minimum pulse width that can be sent through optocouplers in a parallel application is twice tPSK. A cautious design should use a slightly longer pulse width to ensure that any additional uncertainty in the rest of the circuit does not cause a problem. The tPSK specified optocouplers offer the advantages of guaranteed specifications for propagation delays, pulsewidth distortion and propagation delay skew over the recommended temperature, and power supply ranges. Powering Sequence Speed Improvement VDD needs to achieve a minimum level of 3V before powering up the output connecting component. A peaking capacitor can be placed across the input current limit resistor (Figure 11) to achieve enhanced speed performance. The value of the peaking cap is dependent to the rise and fall time of the input signal and supply voltages and LED input driving current (If ). Figure 12 shows significant improvement of propagation delay and pulse with distortion with added 100pF peak capacitor at driving current of 6mA and 5V power supply. Input Limiting Resistor ACPL-W70L and ACPL-K73L are direct current driven (Figure 8), and thus eliminate the need for input power supply. To limit the amount of current flowing through the LED, it is recommended that a 530ohm resistor is connected in series with anode of LED (i.e. Pin 1 for ACPL-W70L, Pin 1 and P4 for ACPL-K73L) at 5V input signal. At 3.3V input signal, it is recommended to connect 250ohm resistor in series with anode of LED. The recommended limiting resistors is based on the assumption that the driver output impedence is 50Ω (as shown in Figure 11). R drv = 50Ω Vi + C peak Rlimit 0.1µF - t PHL 25 VO 5 -40 -20 0 40 5 60 80 40 60 80 100 tPLH 30 25 t PHL 20 t PLH 5 40 20 tPHL 35 10 |PWD| 20 10 |PWD| 15 t PLH 10 100 0 With peaking cap Without peaking cap |PWD| -40 -20 0 20 40 60 80 100 (ii) VDD2=3.3V, Cpeak=100pF, Rlimit=250Ω Figure 12. Improvement of tp and PWD with added 100pF peaking capacitor in parallel of input limiting resistor. 11 25 15 t PLH (i) VDD2=5V, Cpeak=100pF, Rlimit=530Ω 15 30 20 5 GND 2 SHIELD 0 With peaking cap Without peaking cap t PHL 20 0 -20 35 30 10 35 Figure 11. Connection t PLH of peaking capacitor (Cpeak) in parallel of the input limiting resistor (Rllimit) to improve speed performance 30 t PHL With peaking cap 25 Without peaking cap t PHL 20 -40 40 t PLH 15 VDD2 GND1 0 35 0 -40 - Common Mode Rejection for ACPL-W70L AND ACPL-K73L Figure 13 shows the recommended driving circuit for the ACPL-W70L and ACPL-K73L for optimal common-mode rejection performance. Two LED-current setting resistors are used instead of one. This is to balance the common mode impedance at LED anode and cathode. Common-mode transients can capacitively couple from the LED anode (or cathode) to the output-side ground causing current to be shunted away from the LED (which can be bad if the LED is on) or conversely cause current to be injected into the LED (bad if the LED is meant to be off ). Figure14 shows the parasitic capacitances which exists between LED anode/ cathode and output ground (CLA and CLC). Also shown in Figure 14 on the input side is an AC-equivalent circuit. Table 1 indicates the directions of ILP and ILN flow depending on the direction of the common-mode transient. For transients occurring when the LED is on, common-mode rejection (CML, since the output is in the “low” state) depends upon the amount of LED current drive (IF). For conditions where IF is close to the switching threshold (ITH), CML also depends on the extent which ILP and ILN balance 1/2R total each other. In other words, any condition where commonmode transients cause a momentary decrease in IF (i.e. when dVCM/dt>0 and |IFP| > |IFN|, referring to Table 1) will cause common-mode failure for transients which are fast enough. Likewise for common-mode transients which occur when the LED is off (i.e. CMH, since the output is “high”), if an imbalance between ILP and ILN results in a transient IF equal to or greater than the switching threshold of the optocoupler, the transient “signal” may cause the output to spike below 2V (which constitutes a CMH failure). By using the recommended circuit in Figure 13, good CMR can be achieved. The resistors recommended in Figure 13 include both the output impedence of the logic driver circuit and the external limiting resistor. The balanced ILEDsetting resistors help equalize the common mode voltage change at anode and cathode to reduce the amount by which ILED is modulated from transient coupling through CLA and CLC. Rtotal =300Ω for VDD=3.3V = 580Ω for VDD=5V V DD2 V DD1 0.1µF 1/2R total 74LS04 OR ANY TOTEMPOLE OUTPUT LOGIC GATE VO GND 2 SHIELD GND 1 VDD ACPL-W70L Figure 13. Recommended drive circuit for ACPL-W70L and ACPL-K73L for high-CMR ½ R total ILP VO C LA ½ R total 530 Ω VDD2 0.1µF 15pF ILN C LC SHIELD 74L504 (ANY TTL/CMOS GATE) 1 2N3906 (ANY PNP) LED 3 GND 2 Figure 14. AC equivalent of ACPL-W70L and ACPL-K73L VDD 12 ACPL-W70L VDD ACPL-W70L 530 Ω 1 1 ½ R total VDD2 ILP VO C LA ½ R total 0.1µF Table 1. Effects of Common Mode Pulse Direction on Transient ILED 15pF ILN Is Momentarily: If |ILP| < |ILN|, LED IF CurrentGND 2 Is Momentarily: away from LED cathode through CLC increased decreased toward LED cathode through CLC decreased increased If dVCM/dt Is: then ILP Flows: and ILN Flows: positive (>0) away from LED anode through CLA negative (