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fod2712a ?optically isolated error ampli?r ?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 december 2010 fod2712a optically isolated error amplifier features optocoupler, precision reference and error amplifier in single package 1.240v ?1% reference ctr 100% to 200% 2,500v rms isolation ul approval e90700 applications power system for workstations telecom central office supply telecom bricks description the fod2712a optically isolated amplifier consists of the popular az431l precision programmable shunt ref- erence and an optocoupler. the optocoupler is a gallium arsenide (gaas) light emitting diode optically coupled to a silicon phototransistor. the reference voltage toler- ance is 1%. the current transfer ratio (ctr) ranges from 100% to 200%. it is primarily intended for use as the error amplifier/ reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc converters. when using the fod2712a, power supply designers can reduce the component count and save space in tightly packaged designs. the tight tolerance reference elimi- nates the need for adjustments in many applications. the device comes in a compact 8-pin small outline package. schematic package outline 1 2 3 4 5 6 7 8 led fb comp gnd nc c e nc
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 2 fod2712a ?optically isolated error ampli?r pin de?itions *the compensation network must be attached between pins 6 and 7. typical application pin number pin name functional description 1n c not connected 2c phototransistor collector 3e phototransistor emitter 4n c not connected 5 gnd ground 6 comp error ampli?r compensation. this pin is the output of the error ampli?r.* 7f bv oltage feedback. this pin is the inverting input to the error ampli?r 8 led anode led. this pin is the input to the light emitting diode. v o v 1 r1 r2 2 3 8 6 7 5 pwm control f an4803 fod2712a
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 3 fod2712a ?optically isolated error ampli?r absolute maximum ratings (t a = 25? unless otherwise speci?d) stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. notes: 1. derate linearly from 25? at a rate of 2.42mw/? 2. derate linearly from 25? at a rate of 1.42mw/?. 3. derate linearly from 25? at a rate of 2.42mw/?. symbol parameter value units t stg storage temperature -40 to +125 ? t opr operating temperature -40 to +85 ? re?w temperature pro?e (refer to 15) v led input voltage 13.2 v i led input dc current 20 ma v ceo collector-emitter voltage 30 v v eco emitter-collector voltage 7 v i c collector current 50 ma pd1 input power dissipation (1) 145 mw pd2 transistor power dissipation (2) 85 mw pd3 total power dissipation (3) 145 mw
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 4 fod2712a ?optically isolated error ampli?r electrical characteristics (v cc = 12v, t a = 25? unless otherwise speci?d) input characteristics notes: 1. the deviation parameters v ref(dev) and i ref(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. the average full-range temperature coefficient of the reference input voltage, ? v ref , is defined as: where ? t a is the rated operating free-air temperature range of the device. 2. the dynamic impedance is defined as |z out | = ? v comp / ? i led . when the device is operating with two external resistors (see figure 2), the total dynamic impedance of the circuit is given by: symbol parameter test conditions min. typ. max. unit v f led forward voltage i led = 10ma, v comp = v fb (fig.1) 1.5 v v ref reference voltage -40? to +85? 25? v comp = v fb , i led = 10ma (fig.1) 1.221 1.259 v 1.228 1.240 1.252 v ref (dev) deviation of v ref over temperature see note 1 t a = -40 to +85? 4 12 mv ? v ref ? v comp ratio of vref variation to the output of the error ampli?r i led = 10 ma, v comp = v ref to 12v (fig. 2) -1.5 -2.7 mv/v i ref f eedback input current i led = 10ma, r1 = 10k ? (fig. 3) 0.15 0.5 ? i ref (dev) deviation of i ref over temperature see note 1 t a = -40 to +85? 0.15 0.3 ? i led (min) minimum drive current v comp = v fb (fig.1) 55 80 ? i (off) off-state error ampli?r current v led = 6v, v fb = 0 (fig.4) 0.001 0.1 ? |z out | error ampli?r output impedance see note 2 v comp = v fb , i led = 0.1ma to 15ma, f < 1khz 0.25 ? ? v ref ppm/? () v ref dev () /v ref t a 25? = () {} 10 6 ? t a ---------------------------------------------------------------------------------------------------- - = z out, tot = ? v ? i ------- -z out 1 r1 r2 ------- - +
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 5 fod2712a ?optically isolated error ampli?r electrical characteristics (v cc = 12v, t a = 25? unless otherwise speci?d) (continued) output characteristics t ransfer characteristics isolation characteristics switching characteristics notes: 1. device is considered as a two terminal device: pins 1, 2, 3 and 4 are shorted together and pins 5, 6, 7 and 8 are shorted together. 2. common mode transient immunity at output high is the maximum tolerable (positive) dvcm/dt on the leading edge of the common mode impulse signal, vcm, to assure that the output will remain high. common mode transient immunity at output low is the maximum tolerable (negative) dvcm/dt on the trailing edge of the common pulse signal,vcm, to assure that the output will remain low. symbol parameter test conditions min. typ. max. unit i ceo collector dark current v ce = 10v (fig. 5) 50 na bv ceo collector-emitter voltage breakdown i c = 1.0ma 70 v bv eco emitter-collector voltage breakdown i e = 100? 7 v symbol parameter test conditions min. typ. max. unit ctr current transfer ratio i led = 10ma, v comp = v fb , v ce = 5v (fig. 6) 100 200 % v ce (sat) collector-emitter saturation voltage i led = 10ma, v comp = v fb , i c = 2.5ma (fig. 6) 0.4 v symbol parameter test conditions min. typ. max. unit i i-o input-output insulation leakage current rh = 45%, t a = 25?, t = 5s, v i-o = 3000 vdc (note 1) 1.0 ? v iso withstand insulation voltage rh 50%, t a = 25?, t = 1 min. (note 1) 2500 vrms r i-o resistance (input to output) v i-o = 500 vdc (note 1) 10 12 ? symbol parameter test conditions min. typ. max. unit b w bandwidth fig. 7 10 khz ? cmh ? common mode transient immunity at output high i led = 0ma, ? v cm ? = 10 v pp rl = 2.2k ? (fig. 8) (note 2) 1.0 kv/? ? cml ? common mode transient immunity at output low i led = 10ma, ? v cm ? = 10 v pp rl = 2.2k ? (fig. 8) (note 2) 1.0 kv/?
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 6 fod2712a ?optically isolated error ampli?r test circuits i (led) v (led) v comp v comp i ceo v ce v ref v ce i (led) v f v ref v ref 82 3 2 3 v v v 6 7 5 i (led) i (led) i (c) i (off) i ref 8 6 2 3 2 3 2 3 v v 7 5 8 6 7 5 8 6 7 5 8 6 2 3 7 5 r1 8 6 r1 r2 7 5 figure 1. v ref , v f, i led (min) test circuit figure 3. i ref test circuit figure 5. i ceo test circuit figure 6. ctr, v ce(sat) test circuit figure 4. i (off) test circuit figure 2. ? v ref/ ? v comp test circuit
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 7 fod2712a ?optically isolated error ampli?r test circuits (continued) 3 2 1 4 8 7 6 a b 5 3 4 2 1 6 5 7 8 v cc = +5v dc v cc = +5v dc i f = 10 ma i f = 0 ma (a) i f = 10 ma (b) v in 0.47v 0.1 v pp 47 ? v out v out vcm 10v p-p r1 2.2k ? r l 1 f + _ figure 7. frequency response test circuit figure 8. cmh and cml test circuit
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 8 fod2712a ?optically isolated error ampli?r typical performance curves v ref ? reference volta ge (v) i ref ? reference curren t (na) fig. 10 reference voltage vs. ambient temperature t a ?ambient temperature ( c) t a ?ambient temperature ( c) t a ?ambient temperature ( c) -40 -20 0 20 40 60 80 1.230 1.236 1.242 1.248 1.254 i led = 10ma fig. 11 reference current vs. ambient temperature -40 -20 0 20 40 60 80 100 50 100 150 200 250 300 350 i led = 10ma r 1 = 10k ? fig. 12 off current vs. ambient temperature -40 -20 0 20 40 60 80 100 i (off) ?off curre nt (na) 0.1 1 10 100 v led = 13.2v v fb = 0 fig. 9a led current vs. cathode voltage v comp ?cathode voltage (v) v comp ?cathode voltage (v) -1.0 -0.5 0.0 0.5 1.0 1.5 i led ?supp ly curr ent (ma) -15 -10 -5 0 5 10 15 t a = 25 c v comp = v fb fig. 9b led current vs. cathode voltage i led ?supp ly current ( a) -150 -120 -90 -60 -30 0 30 60 90 120 150 -1.0 -0.5 0.0 0.5 1.0 1.5 t a = 25 c v comp = v fb
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 9 fod2712a ?optically isolated error ampli?r typical performance curves (continued) fig.13 led forward current vs. forward voltage v f ?forward voltage (v) 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 i led ? forw ard current (ma) 0 5 10 15 20 70 c 0 c 0 c 25 c 25 c fig.14 dark current vs. temperature t a ?ambient temperature ( c) -40 -20 0 20 40 60 80 100 i ceo ?dark c urrent (na) 0.1 1 10 100 1000 fig. 15 collector current vs. ambient temperature t a ?ambient temperature ( c) -40 -20 0 20 40 60 80 100 i c ?coll ector cu rrent (ma) 0 5 10 15 20 25 30 i led = 20ma i led = 10ma i led = 5ma i led = 1ma fig. 16 current transfer ratio vs. led current i led forward current (ma) 0102 0304050 (i c /i f ) ?current transfer ra tio (%) 0 20 40 60 80 100 120 140 160 70 c v ce = 5v fig. 17 saturation voltage vs. ambient temperature t a ?ambient temperature ( c) -40 -20 0 20 40 60 80 100 v ce (sat) ?saturation volta ge (v) 0.10 0.12 0.14 0.16 0.18 0.20 0.22 v ce = 10v v ce = 5v
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 10 fod2712a ?optically isolated error ampli?r typical performance curves (continued) fig. 18 collector current vs. collector voltage v ce ?collector-emitter voltage (v) 012345678910 i c ?collector current (ma) 0 5 10 15 20 25 30 35 40 45 fig. 19 delta v ref /delta v comp vs. ambient temperature t a ?ambient temperature ( c) -40 -20 0 20 40 60 80 100 delt a v ref /delta v comp (mv/v) -2 -1 0 1 fig. 20 voltage gain vs. frequency frequency khz 10 100 1000 voltag e gain, a(v o /v in ) db -15 -10 -5 0 t a = 25 c i led = 20 ma i led = 10 ma i led = 5 ma i led = 1 ma r l =1k ? 500 ? 100 ?
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 11 fod2712a ?optically isolated error ampli?r the fod2712a the fod2712a is an optically isolated error amplifier. it incorporates three of the most common elements neces- sary to make an isolated power supply, a reference volt- age, an error amplifier, and an optocoupler. it is functionally equivalent to the popular az431l shunt volt- age regulator plus the cny17f-3 optocoupler. powering the secondary side the led pin in the fod2712a powers the secondary side, and in particular provides the current to run the led. the actual structure of the fod2712a dictates the minimum voltage that can be applied to the led pin: the error amplifier output has a minimum of the reference voltage, and the led is in series with that. minimum volt- age applied to the led pin is thus 1.24v + 1.5v = 2.74v. this voltage can be generated either directly from the output of the converter, or else from a slaved secondary winding. the secondary winding will not affect regula- tion, as the input to the fb pin may still be taken from the output winding. the led pin needs to be fed through a current limiting resistor. the value of the resistor sets the amount of current through the led, and thus must be carefully selected in conjunction with the selection of the primary side resistor. feedback output voltage of a converter is determined by selecting a resistor divider from the regulated output to the fb pin. the fod2712a attempts to regulate its fb pin to the ref- erence voltage, 1.24v. the ratio of the two resistors should thus be: the absolute value of the top resistor is set by the input offset current of 0.8?. to achieve 1% accuracy, the resistance of r top should be: compensation the compensation pin of the fod2712a provides the opportunity for the designer to design the frequency response of the converter. a compensation network may be placed between the comp pin and the fb pin. in typ- ical low-bandwidth systems, a 0.1? capacitor may be used. for converters with more stringent requirements, a network should be designed based on measurements of the system? loop. an excellent reference for this pro- cess may be found in ?ractical design of power supplies?by ron lenk, ieee press, 1998. secondary ground the gnd pin should be connected to the secondary ground of the converter. no connect pins the nc pins have no internal connection. they should not have any connection to the secondary side, as this may compromise the isolation structure. photo-transistor the photo-transistor is the output of the fod2712a. in a normal configuration the collector will be attached to a pull-up resistor and the emitter grounded. there is no base connection necessary. the value of the pull-up resistor, and the current limiting resistor feeding the led, must be carefully selected to account for voltage range accepted by the pwm ic, and for the variation in current transfer ratio (ctr) of the opto-isolator itself. example: the voltage feeding the led pins is +12v, the voltage feeding the collector pull-up is +10v, and the pwm ic is the fairchild ka1h0680, which has a 5v ref- erence. if we select a 10k ? resistor for the led, the maximum current the led can see is: (12v?.74v) /10k ? = 926?. the ctr of the opto-isolator is a minimum of 100%, and so the minimum collector current of the photo-transistor when the diode is full on is also 926?. the collector resistor must thus be such that: select 10k ? to allow some margin. r top r bottom ------------------------- - v out v ref -------------- 1 = v out 1.24 r top -------------------------------- 8 0 a > 10v 5v r collector ----------------------------------- 9 2 6 a or r collector 5.4k ? ; > <
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 12 fod2712a ?optically isolated error ampli?r package dimensions 8-pin soic surface mount recommended pad layout pa c kage drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package speci?ations do not expand the terms of fairchilds worldwide terms and conditions, speci?ally the warranty therein, which covers fairchild products. always visit fairchild semiconductors online packaging area for the most recent package drawings: http://www .f airchildsemi.com/pac kaging/ lead coplanarity: 0.004 (0.10) max 0.202 (5.13) 0.182 (4.63) 0.021 (0.53) 0.011 (0.28) 0.050 (1.27) typ. 0.164 (4.16) 1 8 0.144 (3.66) 0.244 (6.19) 0.224 (5.69) 0.143 (3.63) 0.123 (3.13) 0.008 (0.20) 0.003 (0.08) 0.010 (0.25) 0.006 (0.16) seating p lane 0.024 (0.61) 0.050 (1.27) dimensions in inches (mm). 0.155 (3.94) 0.275 (6.99) 0.060 (1.52)
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 13 fod2712a ?optically isolated error ampli?r ordering information marking information option example part number description v fod2712av vde 0884 r2 FOD2712AR2 tape and reel (2500 units per reel) r2v FOD2712AR2v vde 0884, tape and reel (2500 units per reel) 1 2 6 4 3 5 de?itions 1f airchild logo 2d e vice number 3 vde mark (note: only appears on parts ordered with vde option ?see order entry table) 4 one digit year code, e.g., ? 5t wo digit work week ranging from ?1 to ?3 6 assembly package code 2712a s yy x v
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 14 fod2712a ?optically isolated error ampli?r carrier tape specifications 4.0 0.10 1.5 min user direction of feed 2.0 0.05 1.75 0.10 5.5 0.05 12.0 0.3 8.0 0.10 0.30 max 8.3 0.10 3.50 0.20 dimensions in mm 0.1 max 6.40 0.20 5.20 0.20 1.5 0.1
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 15 fod2712a ?optically isolated error ampli?r re?w pro?e pro?e freature pb-free assembly pro?e t emperature min. (tsmin) 150? t emperature max. (tsmax) 200? time (t s ) from (tsmin to tsmax) 60?20 seconds ramp-up rate (t l to t p ) 3?/second max. liquidous temperature (t l ) 217? time (t l ) maintained above (t l ) 60?50 seconds p eak body package temperature 260? +0? / ?? time (t p ) within 5? of 260? 30 seconds ramp-down rate (t p to t l ) 6?/second max. time 25? to peak temperature 8 minutes max. time (seconds) te mperature ( c) ti me 25? to peak 260 240 220 200 180 160 140 120 100 80 60 40 20 0 t l t s t l t p t p ts m a x ts m i n 120 preheat area max. ramp-up rate = 3?/s max. ramp-down rate = 6?/s 240 360
?010 fairchild semiconductor corporation www.fairchildsemi.com fod2712a rev. 1.0.1 16 tradem arks th e following includes registered and unregistered trademarks and service marks, owned by fairchild semiconductor and/or its global subsidiaries ,and is not in tended to be an exhaustive list of all such trademarks. a ccupower auto-spm build it now coreplus corepower crossvolt ctl cu rrent transfer logic deuxpeed dual cool ecospark e fficientmax esbc fair child fairchild semiconductor fa ct quiet series fact f ast fa stvcore fetbench flashwriter * fps f-pfs frfet global power resource sm green fps green fps e-series g max gto in tellimax isoplanar me gabuck mi crocoupler microfet mi cropak mi cropak2 m illerdrive moti onmax moti on-spm optohit optologic op toplanar pdp spm powe r-spm po we rtrench powerxs pr ogrammable active droop qfet qs quiet series r apidconfigure savi ng our world ,1mw/w/kwatatime si gnalwise sma rtmax smart start spm stealth s uperfet supe rsot -3 s upersot -6 s upersot -8 s upremos syncfet sy nc-lock * th ep ower franchise th er ight technology for your success tinyb oost tinybuck tiny calc ti nylogic tinyopto tinypower tinypwm tinywire trifault detect t ruecurrent * serdes uhc ultra frfet unifet vcx vi sualmax xs *t rademarks of system general corporation, used under license by fairchild semiconductor. disclaimer fa i rchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function, or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers t hese products. li fe support policy fa i rchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are in tended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance wi th instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. an ti -counterfeiting policy fairchild semiconductor corporation's anti-counterfeiting policy. fairchild's anti-counterfeiting policy is also stated on our external websi te, www.fairchildsemi.com, under sales support. c ounterfeiting of semiconductor parts is a growing problem in the industry. all manufacturers of semiconductor products are experiencing counterf eiting of their parts. cu stomers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, faile da pplications, and increased cost of production and manufacturing delays. fairchild is taking strong measures to protect ourselves and our customers from the proli feration of counterfeit parts. fairchild strongly encourages customers to purchase fairchild parts either directly from fairchild or from authorized fairchi ld distribu tors who are lis ted by country on our web page cited above. products customers buy either from fairchild directly or from authorized fairchild distributors are ge nuine parts, have full traceability, meet fairchild's quality standards for handling and storage and provide access to fairchild's full range of up-to-date technica land product information. fairchild and our authorized distributors will stand behind all warranties and will appropriately address any warranty issues that may arise. fairc hild will not provide any warranty coverage or other assistance for parts bought from unauthorized sources. fairchild is committed to combat this global problem and encou rage our customers to do their part in stopping this practice by buying direct or from authorized distributors. product status definitions defi nition of terms da tasheet identification product st atus definition ad vance information formative / in design datasheet contains the design specifi cations for product development. s pecifications may change in any manner without notice. pr eliminary first production datasheet contains preliminary data; supplementary data will be published at a later date. fairchild se mi conductor reserves the right to make changes at any time without notice to improve design. no i dentification needed full production datasheet contains final specifications. fairchi ld semiconductor reserves the right to make changes at any time without notice to improve the design. obsolete not in production datasheet contains specifications on a product that is discontinued by fairchild semiconductor. th e datasheet is for reference information only. rev. i51 fod2712a ?optically isolated error ampli?r

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