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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-e?ciency algaas led which has higher light output at lower drive currents. both devices have a threshold sensing input bu?er ic that allows threshold levels to be set by a single external resistor over a wide range of input voltages. the input bu?er 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 bu?er 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 e?ect the threshold levels. the acpl-k370 input bu?er ic has a nominal turn-on threshold of 3.8 v(v th+ ) and 2.77 ma (i th+ ). the bu?er 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 (i th+ ), 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. functional diagram features 5% voltage detection accuracy wide ac or dc detection range: up to 1140 vpeak user con?gurable single/dual detection levels built-in hysteresis improves noise immunity very low threshold current: 1.32 ma (acpl-k376) logic compatible output wide output supply voltage: 2 v to 18 v C40c to +105c operating temperature range sso-8 package with 8 mm creepage and clearance safety and regulatory approval (pending): C iec/en/din en 60747-5-5: 1140 vpeak working insulation voltage C ul 1577: 5000 vrms/1minute double protection rating C csa: component acceptance notice #5 applications limit switch sensing low voltage detector ac mains and dc-link voltage detection relay contact monitor relay coil voltage monitor current sensing microprocessor interfacing telephone ring detection connection diagram 1 2 3 4 8 7 6 5 ac1 dc+ dc? ac2 v cc v o gnd truth table (positive logic) input h l output l h nc i cc i o d1 d2 d3 d4 figure 1. functional diagram ac/dc power controller isolation barrier acpl-k370 acpl-k376 gnd1 gnd2 r x figure 2. connection diagram
2 table 1. ordering information the acpl-k370 and acpl-k376 are ul recognized with 5000 vrms for 1 minute per ul1577 (pending). part number option package surface mount tape & reel iec/en/ din en 60747-5-2 quantity rohs compliant acpl-k370 acpl-k376 -000e stretched so-8 x 80 per tube -060e xx 80 per tube -500e xx 1000 per reel -560e xxx 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 certi?cation and tape & reel packaging. package outline drawings stretched so-8 package (sso-8) 5.850 0.50 (0.230 0.010) 5 6 7 8 4 3 2 1 dimensions in millimeters and (inches). lead coplanarity = 0.1 mm (0.004 inches). 6.807 0.127 (0.268 0.005) recommended land pattern 12.650 (0.5) 1.905 (0.1) 3.180 0.127 (0.125 0.005) 0.381 0.130 (0.015 0.005) 1.270 (0.050) bsg 7 (0.453 0.010) (0.008 0.004) (0.0295 0.010) 0.200 0.100 0.750 0.250 11.50 0.250 (0.063 0.005) 1.590 0.127 (0.018) 0.450 45 z = option code [1] rohs-compliance indicator part number date code k370 z yyww note 1. v = options comprise 060; other options are not marked. figure 3.
3 recommended lead-free ir soldering pro?le the recommended re?ow soldering pro?le is per jedec standard j-std-020 (latest revision). non-halide ?ux should be used. table 2. insulation related speci?cations 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 minimum internal plastic gap (clearance) 0.08 mm through insulation distance conductor to conductor tracking resistance cti 175 v din iec 112/vde 0303 part 1 isolation group (per din vde 0109) iiia material group din vde 0109 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 v iorm = 1140 vpeak, and with a highest allowable overvoltage of v iotm = 8000 vpeak. ul approval under the ul 1577 component recognition program up to v iso = 5000 v rms / 1 minute. file e55361. csa approval under csa component acceptance notice #5, file ca 88324.
4 table 3. iec/en/din en 60747-5-5 insulation related characteristics [1] (with option 060) description symbol characteristic units installation classi?cation 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 classi?cation 55/105/21 pollution degree (din vde 0110/1.89) 2 maximum working insulation voltage v iorm 1140 vpeak input to output test voltage, method b v iorm x 1.875 = v pr , 100% production test with t m = 1 second, partial discharge < 5 pc v pr 2137 vpeak input to output test voltage, method a v iorm x 1.6 = v pr , type and sample test, t m = 10 seconds, partial discharge < 5 pc v pr 1824 vpeak highest allowable overvoltage (transient overvoltage, t ini = 60 seconds) v iotm 8000 vpeak safety limiting values (maximum values allowed in the event of a failure) case temperature input current [2] output power [2] t s i s,input p s,output 175 230 600 c ma mw insulation resistance at t s , v io = 500 v r s 10 9 notes: 1. insulation characteristics are guaranteed only within the safet y maximum ratings, which must be ensured by protective circui ts within the application. 2. safety-limiting parameters are dependent on case temperature. the input current, i s,input , should be derated linearly above 25c free-air case temperature at a rate of 1.53 ma / c; the output power, p s,output , should be derated linearly above 25c free-air case temperature at a rate of 4 mw / c.
5 table 4. absolute maximum ratings parameter symbol min max units note storage temperature t s C55 125 c operating temperature t a C40 105 c input current, average i in 50 ma 1 input current, surge i in 140 ma 1, 2 input current, transient i in 500 ma 1, 2 input voltage (pins 2-3) v in C0.5 v input power dissipation p in 200 mw 3 total package power dissipation p t 269 mw 4 output power dissipation p o 163 mw 5 output current, average i o 30 ma 6 supply voltage (pins 8-5) v cc C0.5 20 v output voltage (pins 6-5) v o C0.5 20 v lead solder temperature 260c 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 s at a 120 h z pulse repetition rate. note that the maximum input power, pin, must be observed. 3. derate linearly above 105c free-air temperature at a rate of 10 mw / c. the maximum input power dissipation of 200 mw all ows an input ic junction temperature of 125c at an ambient temperature of t a = 105c. excessive p in and t j may result in ic chip degradation. 4. derate linearly above 105c free-air temperature at a rate of 13.5 mw / c. 5. derate linearly above 105c free-air temperature at a rate of 8.2 mw / c. a maximum output power dissipation of 163 mw allo ws an output ic junction temperature of 125c at an ambient temperature of t a = 105c. 6. derate linearly above 105c free-air temperature at a rate of 1.5 ma / c. table 5. recommended operating conditions parameter symbol min max units note supply voltage v cc 218v operating temperature t a C40 105 c operating frequency, v cc = 5 v f 0 9 khz 1 operating frequency, v cc = 3.3 v f 0 5 khz 1 notes: 1. maximum operating frequency is de?ned when the output waveform at pin 6 obtains only 90% of v cc with r l = 4.7 k , c l = 30 pf using a 5 v square wave input signal.
6 table 6. electrical speci?cations unless otherwise noted, t a = C40c to +105c and v cc = 3 v to 5.5 v. parameter sym. device min typ [1] max units test conditions/notes fig. upper threshold voltage, dc input (pins 2, 3) v th+ 3.6 (C5%) 3.8 4 (+5%) vt a = 25c, v in = v dc+ C v dcC ; ac1 and ac2 open 5, 6 3.35 4.05 v v in = v dc+ C v dcC ; ac1 and ac2 open 5, 6 lower threshold voltage, dc input (pins 2, 3) v thC 2.45 (C5%) 2.59 2.72 (+5%) vt a = 25c, v in = v dc+ C v dcC ; ac1 and ac2 open 5, 6 2.01 2.96 v v in = v dc+ C v dcC ; ac1 and ac2 open 5, 6 upper threshold voltage, ac input (pins 1, 4) v th+ 4.7 (C6%) 5 5.3 (+6%) vt a = 25c, v in = v ac1 C v ac2 , dc+ and dcC open; note 2 5, 6 4.23 5.5 v v in = v ac1 C v ac2 , dc+ and dcC open 5, 6 lower threshold voltage, ac input (pins 1, 4) v thC 3.57 (C6%) 3.8 4.03 (+6%) vt a = 25c, v in = v ac1 C v ac2 , dc+ and dcC open 5, 6 2.87 4.42 v v in = v ac1 C v ac2 , dc+ and dcC open 5, 6 upper threshold current i th+ acpl-k370 2.26 2.77 2.99 ma t a = 25c 5, 6 1.96 3.11 ma 5, 6 upper threshold current i th+ acpl-k376 1.03 1.32 1.46 ma t a = 25c 5, 6 0.87 1.56 ma 5, 6 lower threshold current i thC acpl-k370 1.09 1.44 1.59 ma t a = 25c 5, 6 1 1.62 ma 5, 6 lower threshold current i thC acpl-k376 0.48 0.68 0.77 ma t a = 25c 5, 6 0.43 0.8 ma 5, 6 current hysteresis i hys acpl-k370 1.2 ma i hys = i th+ C i thC 5 acpl-k376 0.6 ma voltage hysteresis v hys 1.2 v v hys = v th+ C v thC 5 input clamp voltage v ihc1 5.4 6.1 6.8 v v ihc1 = v dc+ C v dcC , i in = 10 ma, ac1 & ac2 connected to dcC 4 v ihc2 6.1 6.8 7.4 v v ihc2 = |v ac1 C v ac2 |, |i in | = 10 ma, dc+ and dcC open 4 v ihc3 12.5 13.4 v v ihc3 = v dc+ C v dcC , i in = 15 ma, ac1 & ac2 open 4 v ilc C0.76 v v ilc = v dc+ C v dcC , i in = C10 ma input current i in acpl-k370 3.2 3.9 4.4 ma v dc+ C v dcC = 5 v, ac1 and ac2 open 8 input current i in acpl-k376 1.5 1.9 2.2 ma v dc+ C v dcC = 5 v, ac1 and ac2 open 8 bridge diode forward voltage v d1,2 acpl-k370 0.59 v i in = 3 ma acpl-k376 0.47 v i in = 1.5 ma v d3,4 acpl-k370 0.78 v i in = 3 ma acpl-k376 0.73 v i in = 1.5 ma logic low output voltage v ol 0.05 0.4 v v cc = 4.5 v, i ol = 4.2 ma; note 3 8 logic high output current i oh 100 av oh = v cc = 18 v; note 4 logic low supply current i ccl acpl-k370 0.9 4 ma v dc+ C v dcC = 5 v, v o open 9 acpl-k376 0.5 3 ma logic high supply current i cch 0.002 4 av cc = 18 v, v o open 7 input capacitance c in 50 pf f = 1 mhz, v in = 0 v notes: 1. all typical values are at t a = 25c unless otherwise stated. 2. ac voltage is instantaneous voltage. 3. a logic low output level at pin 6 occurs under the conditions of v in v th+ as well as the range of v in > v thC once v in has exceeded v th+ . 4. a logic high output level at pin 6 occurs under the conditions of v in v thC as well as the range of v in < v th+ once v in has decreased below v thC .
7 table 7. switching speci?cations unless otherwise noted, t a = C40c to +105c. parameter sym device min typ [1] max units test conditions/notes fig. v cc = 4.5 v propagation delay time to logic low at output t phl acpl-k370 3.7 7.5 sr l = 4.7 k , c l = 30 pf; note 2 10 acpl-k376 6.2 12.5 s acpl-k370 3.7 7.5 sr l = 1.8 k , c l = 15 pf; note 2 acpl-k376 6.3 12.5 s propagation delay time to logic high at output t plh acpl-k370 13.8 70 sr l = 4.7 k , c l = 30 pf; note 3 10 acpl-k376 13.3 70 s acpl-k370 8.5 45 sr l = 1.8 k , c l = 15 pf; note 3 acpl-k376 6.4 45 s output rise time (10-90%) t r acpl-k370 25 sr l = 4.7 k , c l = 30 pf 11 acpl-k376 24 s output fall time (90-10%) t f acpl-k370 0.3 sr l = 4.7 k , c l = 30 pf 11 acpl-k376 0.4 s v cc = 3.3 v propagation delay time to logic low at output t phl acpl-k370 4 7.5 sr l = 4.7 k , c l = 30 pf; note 2 acpl-k376 6.8 12.5 s acpl-k370 4 7.5 sr l = 1.8 k , c l = 15 pf; note 2 acpl-k376 6.9 12.5 s propagation delay time to logic high at output t plh acpl-k370 19 90 sr l = 4.7 k , c l = 30 pf; note 3 acpl-k376 18.5 90 s acpl-k370 12.8 70 sr l = 1.8 k , c l = 15 pf; note 3 acpl-k376 12.5 70 s output rise time (10-90%) t r acpl-k370 27 sr l = 4.7 k , c l = 30 pf acpl-k376 26 s output fall time (90-10%) t f acpl-k370 0.3 sr l = 4.7 k , c l = 30 pf acpl-k376 0.5 s v cc = 3 v to 5.5 v common mode transient immunity at logic high output |cm h | 10 kv/ si in = 0 ma, r l = 4.7 k , v o,min = 2 v, v cm = 1500 v; notes 4, 5 common mode transient immunity at logic low output |cm l | acpl-k370 1 kv/ si in = 3.11 ma, r l = 4.7 k , v o,max = 0.8 v, v cm = 500 v; notes 4, 5 acpl-k376 1 kv/ si in = 1.56 ma, r l = 4.7 k , v o,max = 0.8 v, v cm = 500 v; notes 4, 5 notes: 1. all typical values are at t a = 25c unless otherwise stated. 2. the t phl propagation delay is measured from the 2.5 v level of the leading edge of a 5.0 v input pulse (1 s rise time) to the 1.5 v level on the leading edge of the output pulse. c l includes probe and stray wiring capacitance. 3. the t plh propagation delay is measured from the 2.5 v level of the trailing edge of a 5.0 v input pulse (1 s fall time) to the 1.5 v level on the trailing edge of the output pulse. c l includes probe and stray wiring capacitance. 4. common mode transient immunity with a logic high level is the maximum tolerable (positive) dv cm /dt on the leading edge of the common mode pulse, v cm , to insure that the output will remain in a logic high state (i.e., v o > 2.0 v). common mode transient immunity in logic low level is the maximum tolerable (negative) dv cm /dt on the trailing edge of the common mode pulse signal, v cm , to insure that the output will remain in a logic low state (i.e., v o < 0.8 v). 5. in applications where dv cm /dt may exceed 50 kv / s (such as when a static discharge occurs), a series resistor, r cc , should be included to protect the detector ic from destructive high surge currents. the recommended value for r cc is 240 per volt of allowable drop in v cc (between pin 8 and v cc ) with a minimum value of 240 .
8 table 8. package characteristics over recommended temperature range of t a = C40c to 105c unless otherwise speci?ed. parameter symbol min typ max units test conditions input-output momentary withstand voltage v iso 5000 vrms rh 50%, t = 1 min; t a = 25c; notes 1 to 3 input-output resistance r i-o 10 12 v i-o = 500 vdc; note 2 input-output capacitance c i-o 0.6 pf f = 1 mhz, v i-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-outpu t 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 speci?cation, 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, i i-o 5 a).
9 figure 4. typical input characteristics i in vs. v in (ac voltage is an instantaneous value). figure 5. (a) typical transfer characteristics, and (b) input threshold levels. figure 6. typical dc threshold levels vs. temperature for (a) acpl-k370, and (b) acpl-k376. typical performance plots unless otherwise noted, t a = 25c. 0 5 1 0 1 5 20 25 30 35 40 45 50 0 1 23456789 1 0 11 1 2 1 3 1 4 v i n - i npu t vol t age - v i i n - i npu t curren t - ma ac i npu t , p i ns 2, 3 open dc i npu t , s h or t p i ns 1 & 2, s h or t p i ns 3 & 4. dc i npu t , p i ns 1 , 4 open 0 1 2 3 4 5 6 i npu t s i gnal (a) v o - ou t pu t vol t age - v v cc = 5 v r l = 4.7 k i t h acpl-k370 2.77ma 1 .44ma acpl-k376 1 .32ma 0.68ma v t h(ac) all 5v 3.8v pins 1 , 4 i npu t signa l pins 2, 3 or 1 , 4 device th+ thC i npu t connec t ion (b) v t h(dc) all 3.8v 2.59v pins 2, 3 th- th+ acpl - k370 1 .8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 - 60 - 40 - 20 0 20406080 1 00 1 20 t a - t empera t ure - c v th - th res h old vol t age - v 0.9 1 . 1 1 .3 1 .5 1 .7 1 .9 2. 1 2.3 2.5 2.7 2.9 3. 1 3.3 i th - th res h old curren t - ma v th+ i thC i th+ v thC acpl - k376 1 .8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 - 60 - 40 - 20 0 20406080 1 00 1 20 t a - t empera t ure - c v th - th res h old vol t age - v 0.4 0.5 0.6 0.7 0.8 0.9 1 1 . 1 1 .2 1 .3 1 .4 1 .5 1 .6 i th - th res h old curren t - ma v th+ i thC i th+ v thC
10 figure 7. typical high level supply current, i cch vs. temperature. figure 8. typical input current, i in , and low level output voltage, v ol vs. temperature for (a) acpl-k370 and (b) acpl-k376. figure 9. typical logic low supply current vs. supply voltage for (a) acpl-k370 and (b) acpl-k376. 1e-5 1e-4 1e-3 1e-2 1e-1 1e+0 -60 -40 -20 0 20 40 60 80 100 120 t a - temperature - c i cch - high level supply current - a acpl-k370 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 -60 -40 -20 0 20 40 60 80 100 120 t a - temperature - c i in - input current - ma 10 20 30 40 50 60 70 80 90 100 110 v ol - low output voltage - mv (a) acpl-k376 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 -60 -40 -20 0 20 40 60 80 100 120 t a - temperature - c i in - input current - ma 10 20 30 40 50 60 70 80 90 100 110 v ol - low output voltage - mv (b) acpl-k370 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 024681012141618 v cc - supply voltage - v i ccl - logic low supply current - ma (a) acpl-k376 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 024681012141618 v cc - supply voltage - v i ccl - logic low supply current - ma (b) i in v dc+ C v dc C = 5v, ac1 and ac2 open v ol v cc = 4.5v, i ol = 4.2ma v ol v cc = 4.5v, i ol = 4.2ma
11 figure 10. typical propagation delay vs. temperature for (a) acpl-k370 and (b) acpl-k376. figure 11. typical rise, fall times vs. temperature for (a) acpl-k370,and (b) acpl-k376. figure 12. typical external threshold characteristics, v vs. r x for (a) acpl-k370 and (b) acpl-k376. acpl-k370 0 5 10 15 20 25 30 35 40 -60 -40 -20 0 20 40 60 80 100 120 t a - temperature - c t p - propagation delay - s t plh t phl (a) acpl-k376 0 5 10 15 20 25 30 35 40 -60 -40 -20 0 20 40 60 80 100 120 t a - temperature - c t p - propagation delay - s r l = 4.7k , c l = 30pf, v cc = 4.5v r l = 4.7k , c l = 30pf, v cc = 4.5v t plh t phl (b) t a - temperature - c (a) t a - temperature - c (b) acpl-k376 0 50 100 150 200 250 300 0 100 200 300 400 500 r x - external series resistor - k v - external threshold voltage - v dc: v th+ = 3.8v, v th C = 2.59v; ac: v th+ = 5v, v th C = 3.8v; i th+ = 1.32ma, i th C = 0.68ma (ac voltage is instantaneous value) (b) acpl-k370 0 50 100 150 200 250 300 0 40 80 120 160 200 240 r x - external series resistor - k v - external threshold voltage - v (a) dc: v th+ = 3.8v, v th C = 2.59v; ac: v th+ = 5v, v th C = 3.8v; i th+ = 2.77ma, i th C = 1.44ma (ac voltage is instantaneous value) v + (ac) v + (dc) v C (ac) v C (dc) v + (ac) v + (dc) v C (ac) v C (dc) acpl-k370 0 10 20 30 40 50 60 70 80 -60 -40 -20 0 20 40 60 80 100 120 t r - rise time - s 100 200 300 400 500 600 700 800 900 t f - fall time - ns t r t f acpl-k376 0 10 20 30 40 50 60 70 80 -60 -40 -20 0 20 40 60 80 100 120 t r - rise time - s 200 300 400 500 600 700 800 900 1000 t f - fall time - ns t r t f r l = 4.7k , c l = 30pf, v cc = 4.5v r l = 4.7k , c l = 30pf, v cc = 4.5v
12 electrical considerations the acpl-k370/k376 optocouplers have internally tem- perature compensated, predictable voltage and current threshold points. this allows a single external resistor, r x , to determine larger external threshold voltage levels. for a desired external threshold voltage, v , the approximate r x value is shown in figure 12. equation 1 can be used to calculate rx. v + and v C voltage threshold levels can be simultaneously set with two resistors, r x and r p, as shown in figure 13 and determined by equations 4 and 5. r x 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 r x and r p can be used to allow a speci?c 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 dv cm /dt may be extremely large (such as with a static discharge), a series resistor, r cc , should be connected in series with v cc and pin 8 to protect the detector ic from destructive high surge currents. the recommended value for r cc is 240 per volt of allowable drop in v cc (between pin 8 and v cc ) with a minimum value of 240 . in addition, it is recommended that a ceramic disc bypass capacitor of 0.01 f be placed between pins 5 and 8 to reduce the e?ect of power supply noise. for interfacing ac signals to ttl systems, output low pass ?ltering can be performed with a pull-up resistor of 1.5 k and 20 f capacitor. this application requires a schmitt trigger gate to avoid slow rise time chatter problems. for ac input applications, a ?lter capacitor can be placed across the dc input terminals for either signal or transient ?ltering. figure 13. external threshold voltage level selection. either ac (pins 1 and 4) or dc (pins 2 and 3) input can be used to determine external threshold levels. for single speci?cally selected external threshold voltage level v + or v C , r x can be determined without use of r p via: v +(C) C v th+(C) r x = equation 1 i th+(C) for dual speci?cally selected external threshold voltage levels, v + and v C , the use of r x and r p will permit this selection. two equations can be written: v th+ v + = r x ( i th+ + ) + v th+ equation 2 r p v thC v C = r x ( i thC + ) + v thC equation 3 r p solving these equations for r x and r p yields the following two expressions: v thC (v + ) C v th+ (v C ) r x = equation 4 i th+ (v thC ) C i thC (v th+ ) v thC (v + ) C v th+ (v C ) r p = equation 5 i th+ (v C C v thC ) + i thC (v th+ C v + ) where v + and v C are the desired external voltage threshold levels, and values for v th and i th 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 i th 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 th+ v + C v th+ i th+ and < equation 6 vC v thC v C C v thC i thC conversely, if the denominator of equation 4 is negative, then the following ratios must hold: v + v th+ v + C v th+ i th+ and > equation 7 vC v thC v C C v thC i thC refer to application note 1004 for more application infor- mation and worked out examples. isolation barrier c l gnd r x 1 2 3 4 8 7 6 5 ac1 dc+ dc C ac2 v cc nc v o gnd i th v th v r l v o v cc r p
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 r 2 coupler? 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

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