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nc anode cathode nc v cc v b v o gnd HCPL-4701/070a v o2 v o1 v cc gnd anode 1 cathode 1 cathode 2 anode 2 7 5 6 8 2 3 4 1 truth table led on off v o low high 7 5 6 8 2 3 4 1 hcpl-4731/073a features ultra low input current capability - 40 a specified for 3 v operation typical power consumption: <1 mw input power: <50 w output power: <500 w ? ill operate with v cc as low as 1.6 v high current transfer ratio: 3500% at i f = 40 a ttl and cmos compatible output specified ac and dc performance over temperature: 0 c to 70 c safety approval: ul recognized ?3750 v rms for 1 minute and 5000 v rms* for 1 minute per ul1577 csa approved iec/en/din en 60747-5-2 approved with v iorm = 630 v peak (option 060) for HCPL-4701 8-pin product compatible with 6n138/6n139 and hcpl-2730/hcpl-2731 available in 8-pin dip and soic-8 footprint through hole and surface mount assembly available 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. functional diagram *5000 v rms/1 minute rating is for option 020 (HCPL-4701 and hcpl-4731) products only. a 0.1 f bypass capacitor connected between pins 8 and 5 is recommended. applications battery operated applications isdn telephone interface ground isolation between logic families ?ttl, lsttl, cmos, hcmos, hl-cmos, lv-hcmos low input current line receiver eia rs-232c line receiver telephone ring detector ac line voltage status indicator ?low input power dissipation low power systems ?ground isolation portable system i/o interface HCPL-4701/-4731/-070a/-073a ve ry low power consumption high gain optocouplers data sheet
2 description these devices are very low power consumption, high gain single and dual channel optocouplers. the HCPL-4701 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 a 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 v cc and v o terminals may 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 a of led current and v cc 3v. the so-8 does not require ?hrough 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. selection guide widebody 8-pin dip package hermetic (300 mil) small outline so-8 (400 mil) single and dual single dual minimum absolute dual single channel channel channel single input on maxi- channel channel package package package channel current minimum mum packages package hcpl- hcpl- hcpl- package (i f ) ctr v cc hcpl- 6n139 [1] 2731 [1] 0701 [1] 0731 [1] hcnw139 [1] 0.5 ma 400% 18 v 6n138 [1] 2730 [1] 0700 [1] 0730 [1] hcnw138 [1] 1.6 ma 300% 7 v HCPL-4701 4731 070a 0730a 40 a 800% 18 v 0.5 ma 300% 20 v 5701 [1] 5700 [1] 5731 [1] 5730 [1] notes: 1. technical data are on separate avago publication.
3 ordering information HCPL-4701, hcpl-4731, hcpl-070a and hcpl-073a are ul recognized with 3750 vrms for 1 minute per ul1577 and are approved under csa component acceptance notice #5, file ca 88324. option part rohs non rohs surface gull tape ul 5000 vrms/ iec/en/din number compliant compliant package mount wing & reel 1 minute rating en 60747-5-2 quantity -000e no option 300 mil dip-8 50 per tube -300e -300 x x 50 per tube -500e -500 x x x 1000 per reel HCPL-4701 -020e -020 x 50 per tube hcpl-4731 -320e -320 x x x 50 per tube -520e -520 x x x x 1000 per reel -060e -060 x 50 per tube -360e -360 x x x 50 per tube -560e -560 x x x x 1000 per reel -000e no option so-8 100 per tube hcpl-070a -500e -500 x x x 1500 per reel hcpl-073a -060e -060 x 100 per tube -560e -560 x x x x 1500 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: HCPL-4701-560e to order product of 300 mil dip gull wing surface mount package in tape and reel packaging with iec/en/din en 60747-5-2 safety approval and rohs compliant. example 2: hcpl-070a to order product of surface mount small outline so-8 package and non rohs compliant. option datasheets are available. contact your avago sales representative or authorized distributor for information. remarks: the notation ?xxx?is used for existing products, while (new) products launched since july 15, 2001 and rohs compliant will use xxxe.
4 i f2 6 5 gnd 3 4 v o2 v f2 i o2 + i f1 8 7 v cc 1 2 v o1 i cc v f1 i o1 + shield use of a 0.1 ? bypass capacitor connected between pins 5 and 8 is recommended (see note 8) schematic HCPL-4701 and hcpl-070a hcpl-4731 and hcpl-073a i f 8 v cc 2 3 i cc v f anode cathode + v b i b 6 5 gnd v o i o 7 shield
5 package outline drawings 8-pin dip package (HCPL-4701, hcpl-4731) 8-pin dip package with gull wing surface mount option 300 (HCPL-4701, hcpl-4731) 9.65 ?0.25 (0.380 ?0.010) 1.78 (0.070) max. 1.19 (0.047) max. a xxxxz yyww date code 1.080 ?0.320 (0.043 ?0.013) 2.54 ?0.25 (0.100 ?0.010) 0.51 (0.020) min. 0.65 (0.025) max. 4.70 (0.185) max. 2.92 (0.115) min. dimensions in millimeters and (inches). 5 6 7 8 4 3 2 1 5?typ. option code* 0.254 + 0.076 - 0.051 (0.010 + 0.003) - 0.002) 7.62 ?0.25 (0.300 ?0.010) 6.35 ?0.25 (0.250 ?0.010) type number *marking code letter for option numbers "l" = option 020 "v" = option 060 option numbers 300 and 500 not marked. note: floating lead protrusion is 0.25 mm (10 mils) max. 3.56 ?0.13 (0.140 ?0.005) 0.635 ?0.25 (0.025 ?0.010) 12?nom. 9.65 ?0.25 (0.380 ?0.010) 0.635 ?0.130 (0.025 ?0.005) 7.62 ?0.25 (0.300 ?0.010) 5 6 7 8 4 3 2 1 9.65 ?0.25 (0.380 ?0.010) 6.350 ?0.25 (0.250 ?0.010) 1.016 (0.040) 1.27 (0.050) 10.9 (0.430) 2.0 (0.080) land pattern recommendation 1.080 ?0.320 (0.043 ?0.013) 3.56 ?0.13 (0.140 ?0.005) 1.780 (0.070) max. 1.19 (0.047) max. 2.54 (0.100) bsc dimensions in millimeters (inches). lead coplanarity = 0.10 mm (0.004 inches). note: floating lead protrusion is 0.25 mm (10 mils) max. 0.254 + 0.076 - 0.051 (0.010 + 0.003) - 0.002)
6 small-outline so-8 package (hcpl-070a, hcpl-073a) xxx yww 8765 4 3 2 1 5.994 ?0.203 (0.236 ?0.008) 3.937 ?0.127 (0.155 ?0.005) 0.406 ?0.076 (0.016 ?0.003) 1.270 (0.050) bsc * 5.080 ?0.127 (0.200 ?0.005) 3.175 ?0.127 (0.125 ?0.005) 1.524 (0.060) 45?x 0.432 (0.017) 0.228 ?0.025 (0.009 ?0.001) type number (last 3 digits) date code 0.305 (0.012) min. * total package length (inclusive of mold flash) 5.207 ?0.254 (0.205 ?0.010) dimensions in millimeters (inches). lead coplanarity = 0.10 mm (0.004 inches) max. 0.203 ?0.102 (0.008 ?0.004) 7 note: floating lead protrusion is 0.15 mm (6 mils) max. 7.49 (0.295) 1.9 (0.075) 0.64 (0.025) land pattern recommendation pin one solder reflow thermal profile 0 time (seconds) temperature (?) 200 100 50 150 100 200 250 300 0 30 sec. 50 sec. 30 sec. 160? 140? 150? peak temp. 245? peak temp. 240? peak temp. 230? soldering time 200? preheating time 150?, 90 + 30 sec. 2.5? ?0.5?/sec. 3? + 1?/?.5? tight typical loose room temperature preheating rate 3? + 1?/?.5?/sec. reflow heating rate 2.5? ?0.5?/sec. figure 1a. solder reflow thermal profile. note: non-halide flux should be used.
7 regulatory information the HCPL-4701/4731 and hcpl- 070a/073a have been approved by the following organizations: ul recognized under ul 1577, component recognition program, file e55361. csa approved under csa component acceptance notice #5, file ca 88324. iec/en/din en 60747-5-2 approved under: iec 60747-5-2:1997 + a1:2002 en 60747-5-2:2001 + a1:2002 din en 60747-5-2 (vde 0884 teil 2):2003-01. (option 060 only) insulation related specifications 8-pin dip (300 mil) so-8 parameter symbol value value units conditions minimum external air l(101) 7.1 4.9 mm measured from input terminals to gap (external output terminals, shortest distance clearance) through air. minimum external l(102) 7.4 4.8 mm measured from input terminals to tracking (external output terminals, shortest distance creepage) path along body. minimum internal plastic 0.08 0.08 mm through insulation distance, conductor gap (internal clearance) to conductor, usually the direct distance between the photoemitter and photodetector inside the optocoupler cavity. tracking resistance cti 200 200 volts din iec 112/ vde 0303 part 1 (comparative tracking index) isolation group iiia iiia material group din vde 0110, 1/89, table 1) option 300 ?surface mount classification is class a in accordance with cecc 00802. figure 1b. pb-free ir profile. recommended pb-free ir profile 217 ? ramp-down 6 ?/sec. max. ramp-up 3 ?/sec. max. 150 - 200 ? 260 +0/-5 ? t 25 ? to peak 60 to 150 sec. 20-40 sec. time within 5 ? of actual peak temperature t p t s preheat 60 to 180 sec. t l t l t smax t smin 25 t p time temperature notes: the time from 25 ? to peak temperature = 8 minutes max. t smax = 200 ?, t smin = 150 ? note: non-halide flux should be used.
8 iec/en/din en 60747-5-2 insulation related characteristics (HCPL-4701 option 060 only) description symbol characteristic units installation classification per din vde 0110/1.89, table 1 for rated mains voltage 300 v rms i-iv for rated mains voltage 450 v rms i-iii climatic classification 55/85/21 pollution degree (din vde 0110/1.89) 2 maximum working insulation voltage v iorm 630 v peak input to output test voltage, method b* v iorm x 1.87 = v pr , 100% production test with t m = 1 sec, v pr 1181 v peak partial discharge < 5 pc input to output test voltage, method a* v iorm x 1.5 = v pr , type and sample test, v pr 945 v peak t m = 60 sec, partial discharge < 5 pc highest allowable overvoltage* (transient overvoltage, t ini = 10 sec) v iotm 6000 v peak safety limiting values (maximum values allowed in the event of a failure, also see figure 16, thermal derating curve.) case temperature t s 175 c input current i s,input 230 ma output power p s,output 600 mw insulation resistance at t s , v io = 500 v r s >10 9 ? *refer to the front of the optocoupler section of the current catalog, under product safety regulations section, iec/en/din en 60747-5-2, for a detailed description. note: isolation characteristics are guaranteed only within the safety maximum ratings which must be ensured by protective circu its in application.
9 absolute maximum ratings (no derating required up to 70 c) parameter symbol minimum maximum units storage temperature t s -55 125 c operating temperature t a -40 85 c average forward input current (HCPL-4701/4731) i f(avg) 10 ma average forward input current (hcpl-070a/073a) i f(avg) 5ma peak transient input current (HCPL-4701/4731) i fpk 20 ma (50% duty cycle, 1 ms pulse width) peak transient input current (hcpl-070a/073a) i fpk 10 ma (50% duty cycle, 1 ms pulse width) reverse input voltage v r 2.5 v input power dissipation (each channel) p i 15 mw output current (each channel) i o 60 ma emitter base reverse voltage (HCPL-4701/070a) v eb 0.5 v output transistor base current (HCPL-4701/070a) i b 5ma supply voltage v cc -0.5 18 v output voltage v o -0.5 18 v output power dissipation (each channel) p o 100 mw total power dissipation (each channel) p t 115 mw lead solder temperature (for through hole devices) 260 c for 10 sec., 1.6 mm below seating plane reflow temperature profile see package outline drawings section (for soic-8 and option #300) recommended operating conditions parameter symbol min. max. units power supply voltage v cc * 1.6 18 v forward input current (on) i f(on) 40 5000 a forward input voltage (off) v f(off) 0 0.8 v operating temperature t a 070 c *see note 1.
10 electrical specifications 0 c t a 70 c, 4.5 v v cc 20 v, 1.6 ma i f(on) 5 ma, 0 v v f(off) 0.8 v, unless otherwise specified. all typicals at t a = 25 c. see note 8. device parameter symbol hcpl- min. typ.* max. units test conditions fig. note current ctr 800 3500 25k % i f = 40 a, v o = 0.4 v 4, 5 2 transfer v cc = 4.5 v 600 3000 8k i f = 0.5 ma, v cc = 4.5 v 700 3200 25k i f = 40 a 500 2700 8k i f = 0.5 ma logic low v ol 0.06 0.4 v i f = 40 a, i o = 280 a 2, 3 0.04 0.4 i f = 0.5 ma, i o = 2.5 ma logic high i oh 0.01 5 av o = v cc = 3 to 7 v, output current i f = 0 ma 0.02 80 v o = v cc = 18 v, i f = 0 ma logic low i ccl 4701/070a 0.02 0.2 ma i f = 40 av o = open 0.1 1 i f = 0.5 ma 4731/073a 0.04 0.4 i f = 40 a 0.2 2.0 i f = 0.5 ma logic high i cch 4701/070a <0.01 10 ai f = 0 ma v o = open 4731/073a <0.01 20 input forward v f 1.1 1.25 1.4 v i f = 40 to 500 a, 6 v oltage t a = 25 c 0.95 1.5 i f = 40 to 500 a input reverse bv r 3.0 5.0 v i r = 100 a, t a = 25 c 2.5 i r = 100 a temperature ? v f / ? t a -2.0 mv/ ci f = 40 a -1.6 i f = 0.5 ma input capacitance c in 18 pf f = 1 mhz, v f = 0 v *all typical values at t a = 25 c and v cc = 5 v, unless otherwise noted. ratio supply current supply current output voltage coefficient of forward voltage breakdown v oltage
11 package characteristics device parameter symbol hcpl- min. typ.* max. units test conditions fig. note input-output momentary v iso 3750 v rms rh 50%, 3, 4 withstand voltage** t = 1 min., option 020 4701 5000 3, 4a 4731 resistance r i-o 10 12 ? v i-o = 500 vdc 3 (input-output) rh 45% capacitance c i-o 0.6 pf f = 1 mhz 3 (input-output) insulation leakage i i-i 4731 0.005 arh 45%, t = 5 s, 5 current (input-input) 073a v i-i = 500 vdc resistance (input-input) r i-i 10 11 ? capacitance c i-i 4731 0.03 pf f = 1 mhz 5 (input-input) 073a 0.25 *all typical values at t a = 25 c and v cc = 5 v. **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 60747-5-2 insulation characteristics table (if applicable), your equipment level safety specification or avago application note 1074 entitled ?ptocoupler input-out put endurance voltage. switching specifications (ac) over recommended operating conditions t a = 0 c to 70 c, v cc = 3 v to 18 v, unless otherwise specified. device parameter symbol hcpl- min. typ.* max. units test conditions fig. note propagation t phl 65 500 si f = 40 a, r l = 11 to 16 k ? ,7, 9 9, 10 delay time v cc = 3.3 to 5 v 325 t a = 25 c i f = 0.5 ma, 30 propagation t plh 70 500 si f = 40 a, r l = 11 to 16 k ? ,7, 9 9, 10 delay time v cc = 3.3 to 5 v 34 60 t a = 25 c i f = 0.5 ma, 4701/4731 90 070a/073a 130 common mode |cm h |1 ,000 10,000 v/ si f = 0 ma, r l = 4.7 to 11 k ? ,8 6, 7 transient v cm = 10 v p-p , immunity at t a = 25 c, logic high output common mode |cm l |1 ,000 10,000 v/ si f = 0.5 ma, r l = 4.7 to 11 k ? ,8 6, 7 transient |v cm | = 10 v p-p , immunity at t a = 25 c 2,000 i f = 40 a, r l = 11 to 16 k ? , |v cm | = 10 v p-p v cc = 3.3 to 5 v, t a = 25 c *all typical values at t a = 25 c and v cc = 5 v, unless otherwise noted. to logic low at output r l = 4.7 k ? to logic high output r l = 4.7 k ? logic low output t a = 25 c
12 notes: 1. specification information is available form the factory for 1.6 v operation. call your local field sales office for further information. 2. dc current transfer ratio is defined as the ratio of output collector current, i o , to the forward led input current, i f , times 100%. 3. device considered a two terminal device: pins 1, 2, 3, and 4 shorted together, and pins 5, 6, 7, and 8 shorted together. 4. in accordance with ul 1577, each optocoupler is proof tested by applying an insulation test voltage 4500 v rms for 1 second (leakage detection current limit, i i-o 5 a. 4a. in accordance with ul 1577, each optocoupler is proof tested by applying an insulation test voltage 6000 v rms for 1 second (leakage detection current limit, i i-o 5 a. this test is performed before the 100% production test for partial discharge (method b) shown in the iec/en/din en 60747-5-2 insulation characteristics table. 5. measured between pins 1 and 2 shorted together, and pins 3 and 4 shorted together. 6. common transient immunity in a logic high level is the maximum tolerable (positive) dv cm /dt on the leading edge of the common mode pulse, v cm , to assure that the output will remain in a logic high state (i.e., v o > 2.0 v). common transient immunity in a logic low level is he maximum tolerable (negative) dv cm /dt on the trailing edge of the common mode pulse, v cm , to assure that the output will remain in a logic low state (i.e., v o < 0.8 v). 7. in applications where dv/dt may exceed 50,000 v/ s (such as static discharge) a series resistor, r cc , should be included to protect the detector ic form destructively high surge currents. the recommended value is r cc = 220 ? . 8. use of a 0.1 f bypass capacitor con- nected between pins 8 and 5 adjacent to the device is recommended. 9. pin 7 open for single channel product. 10. use of resistor between pins 5 and 7 will decrease gain and delay time. significant reduction in overall gain can occur when using resistor values below 47 k ? for single channel product. 11. the applications information section of this data sheet references the hcpl-47xx part family, but applies equally to the hcpl-070a and hcpl- 073a parts. figure 2. dc transfer characteristics (i f = 0.5 ma to 2.5 ma). figure 3. dc transfer characteristics (i f = 50 a to 250 a). figure 4. current transfer ratio vs. forward current. figure 5. output current vs. input diode forward current. figure 6. input diode forward current vs. forward voltage. figure 7. propagation delay vs. temperature. i o ?output current ?ma 0 7 0 v o ?output voltage ?v 2.0 6 5 4 3 2 1 1.0 t a = 25? v cc = 5 v i f = 250 a i f = 200 a i f = 150 a i f = 100 a i f = 50 a i f ?forward current ?ma 0.8 0.01 v f ?forward voltage 1.5 10 1.0 0.1 0.9 1.3 100 1.0 1.1 1.2 1.4 t a = 25? i f v f + i o ?output current ?ma 0 27 0 v o ?output voltage ?v 2.0 24 21 18 15 12 9 6 3 1.0 t a = 25? v cc = 5 v i f = 2.5 m a i f = 2.0 ma i f = 1.5 ma i f = 1.0 ma i f = 0.5 m a normalized current transfer ratio 0.01 1.25 0 i f ?forward current ?ma 10 0.75 0.5 0.25 0.1 1.0 1.0 25? 70? 0? normalized i f = 40 a v o = 0.4 v v cc = 5 v i o ?output current ?ma 0 9 0 i f ?input diode forward current ?ma 0.5 8 7 6 5 4 3 2 1 0.1 v o = 0.4 v v cc = 5 v 0.2 0.3 0.4 25? 0? 70? i p ?propagation delay ?? 0 0 t a ?temperature ?? 70 70 60 50 40 30 20 10 50 i f = 0.5 ma r l = 4.7 k ? 10 20 30 40 60 t plh t phl
13 figure 9. switching test circuit. applications information low-power operation current gain there are many applications where low-power isolation is needed and can be provided by the single-channel HCPL-4701, 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). these opto- couplers are avago? 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 a). this level of input forward current conducting through the led can control a worst-case total output (i ol ) and power supply current (i ccl ) of two and a half milliamperes. typically, the hcpl-47xx can control a total output and supply current of 15 ma. the output current, i o is determined by the led forward current multiplied by the current gain of the optocoupler, i o =i f (ctr)/100%. in particular with the hcpl-47xx opto- couplers, the led can be driven with a very small i f of 40 a to control a maximum i o of 320 a with a worst case design current transfer ratio (ctr) of 800%. typically, the ctr and the corresponding i ol , are 4 times larger. 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 applica- tions. these approximate power dissipation values are listed respectively for the led, for the output v cc and for the open- collector output transistor. those values are summed together for a comparison of total power dissi- pation consumed in either the 3.3 vdc or 5 vdc applications. v o pulse gen. z = 50 ? t = 5 ns o r i monitor f i f 0.1 ? l r * c l = 15 pf r m 0 t phl t plh o v i f ol v 1.5 v 1.5 v 5 v 7 1 2 3 4 5 6 8 10% duty cycle 1/f < 100 ? (saturated response) * c l is approximately 15 pf, which includes probe and stray wiring capacitance. +5 v figure 8. test circuit for transient immunity and typical waveforms. v o i f l r a b pulse gen. v cm + v ff o v ol v o v 0 v 10% 90% 90% 10% switch at a: i = 0 ma f switch at b: i = 0.5 ma f cm v t r t f 5 v +5 v 7 1 2 3 4 5 6 8 r cc (see note 7) 10 v 0.1 ? 220 ?
14 propagation delay when the hcpl-47xx optocoup- ler is operated under very low input and output current condi- tions, 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 propa- gation 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 that are not sensitive to longer propagation delay times and that are easily served by this hcpl- 47xx optocoupler, typically 65 s or greater, are those of status monitoring of a telephone line, power line, battery condition of a portable unit, etc. for faster hcpl-47xx propagation delay times, approximately 30 s, this optocoupler needs to operate at higher i f ( 500 a) and i o ( 1m a) levels. applications 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. telephone line interfaces applications where the hcpl- 47xx optocoupler would be best used are in telephone line inter- face 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) applica- tions, as illustrated in figure 10, can severely restrict the input power that an optocoupler inter- face circuit can use (approxi- mately 3 mw). figure 10 shows three isolated signals that can be served by the small input led current of the hcpl-47xx dual- and single-channel optocouplers. v ery low, total power dissipation occurs with these series of devices. 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. low-power hcpl-47xx optocoupler can help keep higher energy conversion efficiency for the smps. the block diagram of figure 11 shows where low-power isolation can be used. table 1. typical HCPL-4701 power dissipation for 3 v and 5 v applications v cc = 3.3 vdc v cc = 5 vdc ( w) i f = 40 ai f = 500 ai f = 40 ai f = 500 a p led 50 625 50 625 p vcc 65 330 100 500 p o-c [1] 20 10 25 20 p total [2] 135 w 965 w 175 w 1,145 w notes: 1. r l of 11 k ? open-collector (o-c) pull-up resistor was used for both 3.3 vdc and 5 vdc calculations. 2. for typical total interface circuit power consumption in 3.3 vdc application, add to p total approximately 80 w for 40 a (1,025 w for 500 a) led current-limiting resistor, and 960 w for the 11 k ? pull-up resistor power dissipations. similarly, for 5 vdc applications, add to p total approximately 150 w for 40 a (1,875 w for 500 a) led current-limiting resistor and 2,230 w for the 11 k ? pull-up resistor power dissipations. power dissipation
15 figure 12. recommended power supply filter for hcpl-47xx optocouplers. recommended v cc filter 8 0.1 ? v cc 10 ? + 100 ? v o r l 7 6 5 1 2 3 4 HCPL-4701 or hcpl-4731 figure 10. hcpl-47xx isolated monitoring circuits for 2-wire isdn telephone line. figure 11. typical optical isolation used for power-loss indication and regulation signal feedback. 115/230 vac emi filter and current limiter isolation barrier v o gnd 2 1 12 12 soft start command interrupt flag power down power supply filter capacitor switching element rectifier and filter control circuit error feedback via cnr200 HCPL-4701 2-wire isdn line protection circuit p0wer supply secondary power emergency power primary?econdary power isolation barrier vac primary telephone line isolation barrier hcpl-4731 HCPL-4701 switched mode power supply receive transmit line polarity line presence secondary/ emergency power v cc v cc ?return telephone line interface circuit 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.
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 a) 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 - 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 v cc power supply to this optocoupler should be minimized. a recommended v cc filter circuit is shown in figure 12 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 v cc with time to a slower rate that cannot interfere with the optocoupler. common-mode rejection & 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 13, rather than series switch the led current as illustrated in figure 15. not only will cmr be enhanced with these circuits (figures 13 and 14), but the switching speed of the opto- coupler 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 13 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 attempts to inject a current into the off led anode, the schottky diode would divert the interfering current to ground. the combina- tion of the schottky diode forward voltage and the vol saturation voltage of the driver output stage (on-condition) will keep the led voltage at or below 0.8 v. 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 14, 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 capaci- tance 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 hcpl-47xx 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 v cc 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 v cc (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 a. 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. 16
figure 15. series led driver circuit for HCPL-4701/-4731. output power ?p s , input current ?i s 0 0 t s ?case temperature ?? 200 50 400 125 25 75 100 150 600 800 200 100 300 500 700 p s (mw) i s (ma) 175 figure 16. thermal derating curve, dependence of safety limiting value with case temperature per vde 0884. 4.7 ? v cc 0.1 ? + r1 hcpl-47xx active output or open collector r1 = v cc ?v f ?v ol i f for v cc = 5 v dc , i f = 40 ? r1 = 82 k ? (typical) r1 = 62 k ? (worst case) r2 = 8.2 k ? at i oh = 100 ? i total = 640 ? (typical) r2 r2 = 0.8 v i oh max i total = total drive current used: + v cc ?v f ?v ol r1 v cc ?v ol r2 figure 13. recommended parallel led driver circuit for HCPL-4701/-4731. figure 14. recommended alternative led driver circuit for HCPL-4701/-4731 . 4.7 ? v cc 0.1 ? + r1 hcpl-47xx active output or open collector * * use any standard schottky diode. r1 = v cc ?v f i f for v cc = 5 v dc , i f = 40 ? r1 = 91 k ? (typical) r1 = 75 k ? (worst case) r1 hcpl-47xx active output * * use any signal diode. r1 = v oh ?v f i f for v cc = 5 vdc, i f = 40 ? r1 = 36 k ? (typical) r1 = 30 k ? (worst case) for product information and a complete list of distributors, please go to our website: www.avagotech.com avago, avago technologies, and the a logo are trademarks of avago technologies limited in the united states and other countries . data subject to change. copyright ? 2007 avago technologies limited. all rights reserved. obsoletes 5989-2106en av01-0547en june 24, 2007

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