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high stability isolate d error amplifier data sheet ADUM3190 rev. 0 document feedback information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 ? 2013 analog devices, inc. all rights reserved. technical support www.analog.com features stable over time and temperature 0.5% initial accuracy 1% accuracy over the full temp erature range compatible with type ii or type iii compensation networks reference voltage: 1.225 v compatible with dosa low power operation: < 7 ma total wide vo ltage s upply range v dd1 : 3 v to 20 v v dd2 : 3 v to 20 v bandwidth: 400 khz isolation v oltage : 2.5 kv rms safety and regulatory approvals (pending) ul recognition: 2500 v rms for 1 minute per ul 1577 csa component acceptance notice #5 a vde c ertificate of conformity din v vde v 0884 - 10 (vde v 0884 - 10):2006 - 12 v iorm = 560 v peak wide temperature range ? 40 c to + 125 c ambient operation 150 c maximum junction temperature applications linear power supplies inve rters u ninterruptible p ower s upply (ups) dosa - compatible modules voltage monitor s general description the ADUM3190 1 is an isolated error amplifier based on analog devices, inc. , i coupler? tec hnology. the ADUM3190 is ideal for linear feedback power supplies . the primary side controllers of the ADUM3190 enable improveme nts in transient response, power density , and stability as compared to commonly used optocoupler and shunt regulator solutions. unlike optocoupler - based solutions, which have an uncertain current transfer ratio over lifetime and at high temperatures, the ADUM3190 transfer function does not change over its lifetime and it is stable over a wide temperature ran ge of ?40 c to +125 c. included in the ADUM3190 is a wide band operational amplifier for a variety of commo nly used power supply loop compensation techniques. t he ADUM3190 is fast enough to allow a feedback loop to react to fast transient conditions and overcurrent condi - tions. also included is a high accuracy 1.225 v reference to com pare with the supply output set point. the ADUM3190 is packaged in a small 16- lead qsop package for a 2.5 kv rms isolation voltage rating . functional block dia gram figure 1. 1 protected by u.s. patents 5,952, 849, 6,873,065 and 7,075,329. other patents pending. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 tx rx ref ref reg reg uvlo uvlo com p gnd 2 gnd 1 Cin +in ref out v dd1 gnd 1 v reg1 v dd2 gnd 2 v reg2 ref out1 nc ea out2 ea out 1 1335-001
ADUM3190 data sheet rev. 0 | page 2 of 16 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diagram .............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 package characteristics ............................................................... 4 regulatory information ............................................................... 4 insulation and safety related specifications ............................ 4 recommended operating conditions ...................................... 4 din v vde v 0884 - 10 (vde v 0884 - 10) insulation characteristics .............................................................................. 5 absolute maximum ratings ....................................................... 6 esd caution .................................................................................. 6 pin configuration and function descriptions ..............................7 typical performance characteristics ..............................................8 test circuits ..................................................................................... 11 applications information .............................................................. 12 theory of operation .................................................................. 12 accuracy circuit operation ...................................................... 12 application block diagram ...................................................... 12 setting the output voltage ........................................................ 13 dosa module application ....................................................... 14 dc correctness and magnetic field immunity .......................... 14 insulation lifetime ..................................................................... 15 packaging and ordering information ......................................... 16 outline dimensions ................................................................... 16 ordering guide .......................................................................... 16 revision history 2/13 rev ision 0: initial version
data sheet ADUM3190 rev. 0 | page 3 of 16 specifications v dd1 = v dd2 = 3 v to 20 v for t a = t min to t max . all typical specifications are at t a = 25c and v dd1 = v dd2 = 5 v, unless otherwise noted. table 1. parameter test conditions/comments min typ max unit accuracy (1.225 v ? ea out )/1.225 v 100%; see figure 18 initial error t a = 25c 0.25 0.5 % total error t a = t min to t max 0.5 1 % op amp offset error ?5 2.5 +5 mv open-loop gain 66 80 db input common-mode range 0.35 1.5 v gain bandwidth product 10 mhz common-mode rejection 72 db input capacitance 2 pf output voltage range comp pin 0.2 2.7 v input bias current 0.01 a reference output voltage at 25c, 0 ma to 1 ma load, c refout = 15 pf 1.215 1.225 1.235 v ?40c to +125c, 0 ma to 1 ma load, c refout = 15 pf 1.213 1.225 1.237 v output current c refout = 15 pf 2.0 ma uvlo positive going threshold 2.8 2.96 v negative going threshold 2.4 2.6 v ea out impedance v dd2 < uvlo threshold or v dd1 < uvlo threshold high-z output characteristics output gain from comp to ea out , dc, 0.3 v to 2.4 v; and from comp to ea out2 , dc, 0.4 v to 5.0 v 0.9 1.0 1.1 v/v from comp to ea out , 0.3 v to 2.4 v, 3 ma; and from comp to ea out2 , 0.4 v to 5.0 v, 1 ma 2.34 2.6 2.86 v/v output ?3 db bandwidth a and s grades 100 200 khz b and t grades 250 400 khz output voltage ea out 3 ma output low 0.4 v high 2.4 2.5 v ea out2 1 ma output low v dd1 = 4.5 v to 5.5 v 0.3 0.6 v high v dd1 = 4.5 v to 5.5 v 4.8 4.9 v low v dd1 = 10 v to 20 v 0.3 0.6 v high v dd1 = 10 v to 20 v 5.0 5.4 v noise see figure 18 ea out 1.7 mv rms ea out2 4.8 mv rms power supply operating range, side 1 v dd1 3.0 20 v operating range, side 2 v dd2 3.0 20 v power supply rejection dc, v dd1 = v dd2 = 3 v to 20 v 60 db supply current i dd1 see figure 18 1.4 2.0 ma i dd2 see figure 18 2.9 5.0 ma
ADUM3190 data sheet rev. 0 | page 4 of 16 package characterist ics table 2. parameter symbol min typ max unit test conditions/comments resistance input -to - output 1 r i-o 10 13 capacitance input - to - output 1 c i-o 2.2 pf f = 1 mhz input capacitance 2 c i 4.0 pf ic junction -to - ambient thermal resistance thermocouple located at center of package underside 16 - lead qsop ja 76 c/w 1 the device is considered a 2 - terminal device; pin 1 through pin 8 are shorted together, and pin 9 through pin 16 are shorted together. 2 input capacitance is from any input data pin to ground. regulat ory information the ADUM3190 is pending approval by the organizations listed in table 3 . see table 8 and the insulation lifetime section for recommended maximum work ing voltages for specific cross - isolation waveforms and insulation levels. table 3. ul (pending) csa (pending) vde (pending) recogniz ed under 1577 component recognition program 1 approved under csa component acceptance notice #5 a certified according to din v vde v 0884 -10 (vde v 0884 - 10): 2006-12 2 single protection, 2500 v rms isolation voltage, 16- lead qsop basic insulation per csa 60 950-1- 03 and iec 60950 - 1, 400 v rms (565 v peak) maximum working voltage reinforced insulation, 560 v peak file e 214400 file 205078 file 2471900-4880-0001 1 in accordance with ul 1577, each ADUM3190 is proof tested by applying an insulation test voltage 3000 v rms for 1 sec (current leakage detection limit = 5 a). 2 in accordance with din v vde v 0884 - 10 , each ADUM3190 is proof tested by applying an insulation test voltage 1050 v peak for 1 sec (partial discharge detection limit = 5 pc). the asterisk (*) marked on the component designates din v vde v 0884 - 10 approval. insulation and safet y related specifications table 4. parameter symbol val ue unit test conditions /comments rated dielectric insulation voltage 2500 v rms 1- minute duration minimum external air gap (clearance) l(i 01) 3.8 min mm measured from input terminals to output terminals, shortest distance through air minimum external tracking (creepage) l(i 02) 3.1 min mm measured from input terminals to output terminals, shortest distance path along body minimum internal gap (internal clearance) 0.017 min mm insulation distance through insulation tracking resistance (comparative tr acking index ) cti >400 v din iec 112/vde 0303 , part 1 isolation group ii material group din vde 0110, 1/89 , table 1 recommended operatin g conditions table 5. parameter symbol min max unit operating temperature by model t a adum 3190 a/adum 3190b ?40 +85 c adum 3190 s/adum 3190t ?40 +125 c supply voltages 1 v dd1 , v dd2 3.0 20 v input signal rise and fall times t r , t f 1.0 ms 1 all voltages are relative to their respective gr ound s .
data sheet ADUM3190 rev. 0 | page 5 of 16 din v vde v 0884 - 10 (vde v 0884- 10) insulation characteristics these isolators are suitable for reinforced isolation only within the safety limit data. maintenance of the safety data is ensured by protective circuits. the asterisk (*) marking branded on the package denotes din v vde v 0884 - 10 approval for a 560 v peak working voltage. table 6. description test conditions /comments symbol characteristic unit installation classification per din vde 0110 for rated mains voltage 150 v rms i to iv for rated mains voltage 300 v rms i to iii for rated mains voltage 400 v rms i to ii climatic classification 40/105/21 pollution degree per din vde 0110 , table 1 2 maximum working insulation voltage v iorm 560 v peak input -to - output test voltage, method b 1 v iorm 1.875 = v pd(m) , 100% production test, t ini = t m = 1 sec, partial discharge < 5 pc v pd(m) 1050 v peak input -to - output test voltage, method a after environmental tests subgroup 1 v iorm 1.5 = v p d(m) , t ini = 60 sec, t m = 10 sec, partial discharge < 5 pc v pd(m) 840 v peak after input and/or safety test subgroup 2 and subgroup 3 v iorm 1.2 = v pd(m) , t ini = 60 sec, t m = 10 sec, partial discharge < 5 pc v pd(m) 672 v peak highest allowable overvol tage v iotm 3500 v peak surge isolation voltage v peak = 10 kv; 1.2 s rise time ; 50 s, 50% fall time v iosm 4000 v peak safety limiting values maximum value allowed in the event of a failure (see figure 2 ) case temperature t s 150 c safety total dissipated power p s 1.64 w insulation resistance at t s v io = 500 v r s >10 9 figure 2 . thermal derating curve, dependence of safety limiting values on case temperature, per din v vde v 0884 - 10 safe limiting power (w) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 50 100 150 200 ambient temper a ture (c) 1 1335-004
ADUM3190 data sheet rev. 0 | page 6 of 16 absolute maximum rat ings t a = 25c, unless otherwise noted. table 7. parameter ra ting storage temperature (t st ) range ?65 c to + 150c ambient operating temperature (t a ) range ?40 c to + 125c junction temperature ?40 c to + 150c supply voltages v dd1 , v dd2 1 ? 0.5 v to + 24 v v reg1 , v reg2 1 ?0.5 v to + 3.6 v input voltages (+in, ? in ) ?0.5 v to +3.6 v output voltages ref out , c omp , ref out1 , ea out ?0.5 v to + 3.6 v ea out2 ?0.5 v to +5.5 v output current per output pin ?11 ma to + 11 ma common - mode transients 2 ?100 kv/ s to +100 kv/ s 1 all voltages are relative to their respective grounds. 2 refers to common - mode transients across the insulation barrier. common - mode transients exceeding the absolute maximum ratings may cause latch - up or permanent damage. table 8. maximum continuous working voltage 1 para meter max unit constraint waveform ac voltage bipolar 560 v peak 50- year minimum lifetime unipolar 1131 v peak 50 - year minimum lifetime dc voltage 1131 v peak 50- year minimum lifetime 1 refers to continuous voltage magnitude imposed across the isolation barrier. see the insulation lifetime section for more details. esd caution stress es a bo ve thos e l isted under absolute maxim um ratin gs ma y c ause permanent damage to the device. this is a stress rating only; fu nctional operation of the d ev ice at these or any other co nditio ns abo ve those indicated in the operatio na l section of th is speci fi cat ion is not implied. expo su re to absolu te ma ximum rat in g conditions fo r e xtended periods may a ff ect de vi ce reliability.
data sheet ADUM3190 rev. 0 | page 7 of 16 pin configuration and function descripti ons figure 3. pin configuration table 9 . pi n function descriptions pin no. mnemonic description 1 v dd1 supply voltage for side 1 (3.0 v to 20 v). connect a 1 f capacitor between v dd1 and gnd 1 . 2 gnd 1 ground reference for side 1. 3 v reg1 internal supply voltage for side 1. connect a 1 f capacitor between v reg1 and gnd 1 . 4 ref out1 reference output voltage for side 1 . the m aximum capacitance for this pin ( c ref out1 ) must not exceed 15 pf . 5 nc no connection. c onnect pin 5 to gnd 1 ; do not leave this pin floating. 6 ea out2 isolated output voltage 2, open - drain output. connect a pull - up resistor between ea out2 and v dd1 for current up to 1 ma. 7 ea out isolated output voltage . 8 gnd 1 ground reference for side 1. 9 gnd 2 ground reference for side 2. 10 comp output of the op amp. a l oop compensation network can be connected between the comp pin and the ?in pin . 11 ? in inverting op amp i nput. pin 11 is the connection for the power supply setpoint and compensation network. 12 +in non i nverting op amp i nput. pin 12 can be used as a r eference input. 13 ref out reference output voltage for side 2. the m a ximum capacitance for this pin ( c ref out ) must not exceed 15 pf . 14 v reg2 internal supply voltage for side 2. connect a 1 f capacitor between v reg2 and gnd 2 . 15 gnd 2 ground reference for side 2. 16 v dd2 supply voltage for side 2 (3.0 v to 20 v). connect a 1 f capacitor between v dd2 and gnd 2 . 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 top view (not to scale) ADUM3190 com p gnd 2 gnd 1 Cin +in ref out v dd1 nc = no connection. connect pin 5 t o gnd 1 ; do not le a ve this pin flo a ting. v reg1 v dd2 gnd 2 v reg2 ref out1 nc ea out2 ea out 1 1335-005
ADUM3190 data sheet rev. 0 | page 8 of 16 typical performance characteristics figure 4 . typical i dd1 supply current vs. temperature figure 5 . typical i dd2 supply current vs. temperature fig ure 6 . +in, ? in input bias current vs. temperature figure 7 . ref out accuracy vs. temperature figure 8 . ea out accuracy vs. temperature figure 9. op amp offset voltage vs. temperature 0 1 2 3 C40 C20 0 20 40 60 80 100 120 140 i dd1 (ma) tempera ture ( c) v ddx = 20v v ddx = 5v 1 1335-017 0 1 2 3 4 5 C40 C20 0 20 40 60 80 100 120 140 i dd2 (ma) tempera ture (c) v ddx = 20v v ddx = 5v 1 1335-018 C40 C20 0 20 40 60 80 100 120 140 0 2 4 6 8 10 12 input bias current (na) tempera ture (c) 1 1335-019 C40 C20 0 20 40 60 80 100 120 140 1.222 1.223 1.224 1.225 1.226 1.227 1.228 ref out accurac y (v) tempera ture (c) 1 1335-020 C40 C20 0 20 40 60 80 100 120 140 C1.0 C0.5 0 0.5 1.0 ea out accurac y (%) tempera ture ( c) 1 1335-021 C40 C20 0 20 40 60 80 100 120 140 C3 C2 C1 0 1 2 3 op am p offset vo lt age (mv) tempera ture ( c) 1 1335-022
data sheet ADUM3190 rev. 0 | page 9 of 16 figure 10 . op amp open - loop gain vs. temperature figure 11 . ea out gain vs. temperature figure 12 . ea out2 gain vs. temperature figure 13 . ea out offset vs. temperature figure 14 . ea out2 offset vs. temperature figure 15 . output noise with test circuit 1, channel 1 = ea out (10 mv/div), channel 2 = ea o ut2 (10 mv/div) C40 C20 100 50 60 70 80 90 0 20 40 60 80 100 120 140 tempera ture (c) op am p open-loo p gain (db) 1 1335-023 C40 C20 1.05 1.00 1.01 1.02 1.03 1.04 0 20 40 60 80 100 120 140 tempera ture (c) ea out gain (v/v) 1 1335-024 C40 C20 2.70 2.60 2.62 2.64 2.66 2.68 0 20 40 60 80 100 120 140 tempera ture (c) ea out2 gain (v/v) 1 1335-025 C40 C20 0 C100 C80 C60 C40 C20 0 20 40 60 80 100 120 140 tempera ture (c) ea out offset (mv) 1 1335-026 C40 C20 0 C300 C250 C200 C150 C50 C100 0 20 40 60 80 100 120 140 tempera ture (c) ea out2 offset (mv) 1 1335-027 ch1 10mv ch2 10mv m4.0 s a ch1 1.18v t 102.4ns ? ? 1 2 1 1335-028
ADUM3190 data sheet rev. 0 | page 10 of 16 figure 16 . output 100 khz signal with test circuit 3, channel 1 = +in, channel 2 = ea out , channel 3 = ea out2 figure 17 . output square wave response with test circuit 3, channel 1 = +in, channel 2 = ea out , channel 3 = ea out2 ch1 100mv ch2 100mv m2s a ch1 434mv t 0s ? ? ? ch3 200mv 1 3 2 1 1335-029 ch1 20mv ch2 50mv m2s a ch1 399mv t 5.92 s ? ? ? ch3 20mv 1 3 2 1 1335-030
data sheet ADUM3190 rev. 0 | page 11 of 16 test circuits figure 18 . test circuit 1 figure 19 . test circuit 2 figure 20 . test circuit 3 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 tx rx ref ref reg reg uvlo uvlo com p gnd 2 gnd 1 680 ? 2.2nf Cin +in ref out 1f 1f 1f v dd1 gnd 1 v reg1 v dd2 gnd 2 v reg2 1f ref out1 nc ea out2 ea out 1 1335-002 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 tx rx ref ref reg reg uvlo uvlo com p gnd 2 gnd 1 Cin +in ref out 1f 1f 1f v dd1 gnd 1 v reg1 v dd2 gnd 2 v reg2 1f ref out1 r od nc ea out2 ea out 1 1335-003 680 ? 2.2nf 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 tx rx ref ref reg reg uvlo uvlo com p gnd 2 gnd 1 Cin +in ref out 1f 1f 1f v dd1 gnd 1 v reg1 v dd2 gnd 2 v reg2 1f ref out1 r od nc ea out2 ea out 1 1335-031
ADUM3190 data sheet rev. 0 | page 12 of 16 applications informa tion theory o f operation in the test circuits of the ADUM3190 (see figure 18 through figure 20 ), external supply voltages from 3 v to 20 v are provided to the v dd1 and v dd2 pins, and internal regulators provide 3.0 v to operate the internal circuits of each side of the ADUM3190 . an internal precision 1.225 v reference provides the reference for the 1% accuracy of the isolated error amplifier . uvlo circuits monitor the v ddx supplies to turn on the internal circuits when the 2.8 v rising threshold is met and to turn off the error amplifier outputs to a high impedance st ate when v ddx falls below 2.6 v. the o p a mp on the right side of the device has a non inverting +in pin and an inverting ?i n pin available for connecting a feedback voltage in an isolated dc - to - dc converter output, usual ly through a voltage divider. the comp pin is the op amp output, which can be used to attach resistor and capacitor components in a compensation network. th e comp pin internally drives the tx transmitter block, which converts the op amp output voltage into an encoded output that is used to drive the digital isolator transformer. on the left side of the ADUM3190 , the transformer output pwm signal is decoded by the rx block , which converts the signal in to a voltage that drives an amplifier block ; the amplifier block produces the error amplifier output available at the ea out pin. the ea out pin can d eliver 3 ma and has a voltage level between 0. 4 v and 2.4 v, which is typically used to drive the input of a pwm controller in a dc - to - dc circuit. for applications that need more output voltage to drive their controller s, figure 19 illustrates the use of the e aout2 pin output which deliver s up to 1 ma with an output voltage of 0. 6 v to 4.8 v for an output that has a pull - up resistor to a 5 v supply. if the ea out2 pull - up resistor connects to a 10 v to 20 v supply , the output is specified to a minimum of 5.0 v to allow use with a pwm controller requiring a minimum input operation of 5 v. accuracy circuit ope ration see figure 18 and figure 19 for stabi lity of the accuracy circuits . the op amp on the right side of the ADUM3190 , from the ? in pin to the comp pin, has a unity - gain bandwidth (ugbw) of 10 mhz. figure 21 , b ode p lot 1, shows a d ashed line for the op amp alone and its 10 mhz pole. figure 21 also shows t he linear isolator alone ( the blocks from the op amp output to the ADUM3190 output , labeled as the linear isolator) , which introduces a pole at a pproximately 400 khz. th is total bode pl ot of the op amp and linear isolator shows that the phase shift is a pproximately ? 180 from the ? in pin to the ea out pin before the crossover frequency. because a ? 180 phase shift can make the sy stem unstable, adding an i nte - grator configur ation , as shown in the test circuits in figure 18 and figure 19 , co nsisting of a 2.2 nf capacitor and a 680 ? resistor, help s to make the system stable. in figure 22 , bode plot 2 with an i ntegrator configuration added , the sys tem crosses over 0 db at a pproximately 100 khz, but the circuit is more stable with a phase shift of approximately ? 120 , which yields a stable 60 phase margin . this circuit is used for accuracy tests only, not for real - world application s, because it has a 680 ? resistor across the isolation barrier to close the loop for the error amplifier ; this resistor cause s leakage current to flow across the isolation barrier. for this test circuit only, gnd 1 must be connected to gnd 2 to creat e a return for the leakag e current created by the 680 ? resistor connection. figure 21 . bode plot 1 figure 22 . bode plot 2 application block diagram figure 23 shows a typical applicatio n , an isolated error amplifier in primary side control, for the ADUM3190 . t he op amp of the ADUM3190 is used as the error amplifier for the feedback of the output voltage , v out , using a resistor divider to the ? in pin of the op amp . this configuration inverts the output signal at the comp pin when compared to the +in pin , which is connected to the internal 1.225 v reference. for example , when the output voltage , v out , falls due to a load step, the divider voltag e at the ? in pin falls below the +in reference voltage , caus ing the comp pin output signal to go high. the comp output of the op amp is encoded and then decoded back by the digital isolator trans - form er block to a signal that drive s the output of the ADUM3190 op am p and linear isol at or op am p alone frequenc y (hz) 100 1k 10k 100k 1m 10m 100 C90 100 C180 1k 10k 100k 1m 10m frequenc y (hz) linear isol at or pole a t 400khz linear isol at or phase () amplitude (db) 1 1335-006 phase () amplitude (db) op am p and linear isol at or op am p alone frequenc y (hz) 100 1k 10k 100k 1m 10m 100 C90 100 C180 1k 10k 100k 1m 10m frequenc y (hz) linear isol at or pole a t 400khz integr at or configur a tion 1 1335-007
data sheet ADUM3190 rev. 0 | page 13 of 16 high. the output of the ADUM3190 drives the comp pin of the pwm controller, which is designed to reset the pwm l atch output to low only when its comp pin is low. a high at the comp pin has the effect of making the latching pwm com - parator produce a pwm duty cycle output. this pwm duty cycle output drive s the power stage to increase the v out voltage until it returns to regulatio n. figure 23 . application block diagram 1 the power stage output is filtered by output capacitance and , in some app lications , by an inductor. various elements contribute to the gain and phase of the control loop and the result ing stability. the output filter l and output filter c components create a double pole ; the op amp has a pole at 10 mhz (see figure 21 ), and the linear isolator has a pole at 400 khz (see figure 21 and figure 22 ). the output capacitor and its esr can add a zero at a frequency that is dependent on the component type and values. with the ADUM3190 providing the error amplifier, a compensation network is provided from the ? in pin to the comp pin to compensate t he control loop for stability. the compensation network values depend on both the application and the com - ponents that are selected ; information about the component network values is provided in the data sheet of the selected pwm controller. the ADUM3190 has two different error amplifier outputs, ea out and ea out2 . the ea out output, which can drive 3 ma, has a guaranteed maximum high output voltage of at l east 2.4 v, which may not be enough to drive the comp pin of some pwm controllers . the ea out2 pin can drive 1 ma and has an output range that guarantees 5.0 v for a v dd1 voltage range of 10 v to 20 v, which work s well with the comp pin of many pwm contr ol lers. in an application where the 5 v minimum output of the ea out2 pin is not enough to drive the comp pin of some pwm con - trollers, for example , controllers that operate with 6 v or more of comp pin voltage , use ea out2 to drive the fb pin of the error am plifier of the pwm c ontroller (see figure 24 ). the typical v ref voltage level of pwm controllers is a pproximately 1.25 v or 2.5 v, s e t ting the r ef erence level for the fb pin. in figure 24, the ea out2 output is used f or a pwm controller with a 2.5 v reference. figure 24 . application block diagram 2 as shown in figure 24, t he ADUM3190 op amp has the feed - back voltage from the v out output divider is con nected to the +in pin, and the + 1.225 v reference vo ltage connected to the ? in pin. this configuration produces a low going ADUM3190 comp pin when the v out voltage drops from a load step. the ea out2 pin follows the comp pin , going low and connecting to the pwm contro ller fb pin. the error amp lifier of the pwm controller has a reference (v ref ) at the non inverting input, which , when the fb pin is low, mak es the comp pin of the error amp lifier output go high. a high at the comp pin causes the latching pwm comparator to pr oduce a pwm duty cycle output. this pwm duty cycle output drive s the power stage to increase the v out voltage until it return s to regulation. th e a pplication block diagrams ( see figure 23 and figure 24 ) show two different ways to use the ADUM3190 to provide iso - lated feedback in the control loop of an isolated dc - to - dc converter. in both figures , the loop is cl osed a t approximately the 1.225 v reference voltage, providing 1% accuracy over temperature. the ADUM3190 op amp has a high gain bandwidth of 10 mhz to allow the dc - to - dc converter to operate at high switching speeds , enabling smaller values for the o utput filter l and output filter c components. the 400 khz bandwidth of the ADUM3190 error amplifier output offers faster loop resp onse for better transient response than the typic al shunt regulator and optocoupler solutions, which typically have bandwidths of only 25 khz to 50 khz maximum. setting t he output voltage the output voltage in the application circuit can be set with two r esistors in a voltage divider , as shown in figure 25. the output voltage is determined by the following equation , where v ref = 1.225 v : v ou t = v ref (r 1 + r 2 )/r 2 (1) Cin +in ref out 1.225v osc la tching pwm v ref fb com p ea out2 error am p current sense power st age v in v out c 1 compensa tion network l o c o esr dcr c 2 com p r 2 + ADUM3190 pwm controller op am p 1 1335-008 Cin +in ref out 1.225v osc la tching pwm v ref fb com p com p ea out2 error am p current sense power st age v in pwm controller v out l o c o esr dcr c 1 compensa tion network op am p c 2 r 2 + ADUM3190 1 1335-009
ADUM3190 data sheet rev. 0 | page 14 of 16 figure 25 . setting t he output voltage dosa module application figure 26 is a block diagram of a d istributed -p ower open standards alliance (dosa) circuit usin g the ADUM3190 . the block diagram shows how to use the ADUM3190 1.225 v refer - ence and the error amp in a dosa standard power supply module circuit to produce output voltage settings using a combination of resistors. the ADUM3190 1.225 v reference is specified for 1% over the ? 40c to + 125 c temperature range . see table 10 to select the r esistor values to set the output voltage of the module. two different ranges of v out can be implemented, v out > 1.5 v or v out < 1.5 v, depending on the required module . figure 26 . dosa module table 10. resistor values for dosa module module nominal output r3 r4 r5 r6 v out > 1.5 v 1 k 1 k 0 o pen v out < 1.5 v 1 k 0 2.05 k 1.96 k v out > 1.5 v 5.11 k 5.11 k 0 o pen v out < 1.5 v 5.11 k 0 10.5 k 10.0 k dc correctness and magnetic field immuni ty positive and negative logic transitions at the isolator input cause narrow (~1 ns) pulses to be sent to the decoder via the transformer. the decoder is bistable and is, therefore, either set or reset by the pulses, indicating input logic transitions. in the absence of logic transitions of more than 1 s at the input, a periodic set of refresh pulses indicative of the correct input state are sent to ensure dc correctness at the output. if the decoder receives no internal pulses for more than approx - imately 3 s, the input side is ass umed to be unpowered or nonfunc tional, in which case, the isolator output is forced to a default high impedanc e state by the watchdog timer circuit. in addition, the outputs are in a default high impedance state while the power is increasing before the uvlo threshold is crossed. the ADUM3190 is immune to external magnetic fields. the limi - tation on the ADUM3190 magnetic field immunity is set by the condition whereby induced voltage in the transformer receiving coil is sufficiently large to either falsely set or reset the decoder. the following analysis defines the conditions under which this can occur. the 3 v operating condition of the ADUM3190 is examined because it represent s the most susceptible mode of oper ation. the pulses at the transformer output have an amplitude that is greater than 1.0 v. the decoder has a sensing threshold at a ppro ximately 0.5 v, therefore establishing a 0.5 v margin with in which induced voltages ar e tolerated. the voltage induced across the receiving coil is given by v = ( ?d? / dt ) r n 2 , n = 1, 2, , n where: ? is the magnetic flux density (gauss). r n is the radius of the nth turn in the receiving coil (cm). n is the number of turns in the receiving coil. given the geometry of the receiving coil in the ADUM3190 and an imposed requirement that the induced voltage be , at most, 50% of the 0.5 v margin at the decoder, a maximum allowable mag netic field is calculated, as shown in figure 27. figure 27 . maximum allowable external magnetic flux density for example, at a magnetic field frequency of 1 mhz, the maxi - mum allowable magnetic field of 0.0 2 kgauss induces a voltage of 0.25 v at the receiving coil. this is a pproximately 50% of the sensing threshold and does not cause a faulty output transition. simi larly, if such an event were to occur during a transmitted pulse (and ha d the worst - case polarity), the received pulse is reduce d from >1.0 v to 0.75 v, still well above the 0.5 v sensing thresh old of the decoder. the preceding magnetic flux density values correspond to specific current magnitudes at given distances away from the ADUM3190 transformers. figure 28 show s these allowable current magnitudes as a function of frequency for selected dis - tances. as shown figure 28 , the ADUM3190 is immune and can v ref 1.225v v in = 0.35v t o 1.5v ADUM3190 Cin r 1 v out isol a ted dc- t o-dc supp ly r 2 +in ref out error am p 1 1335-010 v ref 1.225v v in = 0.35v t o 1.5v ADUM3190 r 1 v out dos a module r 2 r 3 r 5 error am p r 4 r 6 r trim-u p r trim-down optiona l trim-u p or trim-down resist or or 10% of nomina l v alue according t o dos a 1 1335-0 11 magnetic field frequenc y (hz) 100 maximum allo w able magnetic flux densit y (kgauss) 0.001 1m 10 0.01 1k 10k 10m 0.1 1 100m 100k 1 1335-012
data sheet ADUM3190 rev. 0 | page 15 of 16 be affected only by extremely large currents operat ing at a high frequency very close to the component. for the 1 mhz example, a 0. 7 ka current must be placed 5 mm away from the ADUM3190 to affect the operation of the device . figure 28 . maximum allowable current for various curren t- to - ADUM3190 spacings insulation lifetime all insulation structures eventually break down when subjected to voltage stress over a sufficiently long period. the rate of insu - lation degradation is dependent on the characteristics of the voltage waveform applied across the insulation. in addition to the testing performed by the regulatory agencies, analog devices carries out an extensive set of evaluations to determine the lifetime of the insula tion structure within the ADUM3190 . analog devices performs accelerated life testing using voltage levels higher than the rated continuous working voltage. accel - eration factors for several op erating conditions are determined. these factors allow calculation of the time to failure at the actual working voltage. the values shown in table 8 summarize the peak voltage for 50 years of service life for a bi polar ac operating condition. in many cases, the approved working voltage is higher than the 50- year service life voltage. operation at these high working voltages can lead to shortened insulation life in some cases. the ADUM3190 insulation lifetime depends on the voltage wave - form type imposed across the isolation barrier. the i coupler insulation structure degrades at different rates depending on whether the waveform is bipolar ac, unipolar a c, or dc. figure 29 , figure 30 , and figure 31 illustrate these different isolation voltage waveforms. a bipolar ac voltage environment is the worst case for the i coupler products yet meets the 50 - year operating lifetime recommended by analog devices for maximum working voltage. in the case of unipolar ac or dc voltage, the stress on the insulation is sig - nificantl y lower. this allo ws operation at higher working voltages while still ach ieving a 50 - year service life. treat a ny cross - insulation voltage waveform that does not conform to figure 30 or fig ure 31 as a bipolar ac waveform, and limit its peak voltage to the 50 - year lifetime voltage value listed in table 8 . note that the voltage presented in figure 30 is shown as sinu - soidal for illustration purposes only. it is meant to represent any voltage waveform varying between 0 v and some limiting value. the limiting value can be positive or negative, but the voltage cannot cross 0 v. figure 29 . bipolar ac waveform figure 30 . unipolar ac waveform figure 31 . dc waveform magnetic field frequenc y (hz) maximum allo w able current (ka) 1000 100 10 1 0.1 0.01 1k 10k 100m 100k 1m 10m dis t ance = 5mm dis t ance = 1m dis t ance = 100mm 1 1335-013 0v rated peak voltage 1 1335-014 0v rated peak voltage 1 1335-015 0v rated peak voltage 1 1335-016
ADUM3190 data sheet rev. 0 | page 16 of 16 packaging and ordering information outline dimensions figure 32 . 16 -l ead s hrink small outli ne package [qsop] (rq - 16) dimensions shown in inches and ( millimeters) ordering guide model 1 temperature range bandwidth (typical) package description package option adum 3190 arqz ?40 c to + 85c 2 00 khz 16 - lead qsop rq - 16 adum 3190 arqz - rl 7 ?40 c to + 85c 2 00 khz 16 - lead qsop rq - 16 adum 3190 brqz ?40 c to + 85c 400 khz 16 - lead qsop rq - 16 ADUM3190brqz - rl7 ?40 c to + 85c 400 khz 16 - lead qsop rq - 16 adum 3190 srqz ?40 c to + 125c 2 00 khz 16 - lead qsop rq - 16 ADUM3190srqz - rl7 ? 40 c to + 125 c 2 00 khz 16 - lead qsop rq - 16 adum 3190 trqz ?40 c to + 125c 400 khz 16 - lead qsop rq - 16 adum 3190 trqz - rl 7 ?40 c to + 125c 400 khz 16 - lead qsop rq - 16 eval - ADUM3190 eb z evaluation board 1 z = rohs compliant part. compl iant t o jede c stan dards mo-1 37-ab controlli ng dim ensio ns are in inc hes; milli meter dimen sions (in par enthe ses) a re rou nded- off in ch equ ivalents for refer ence o nly an d are n ot app ropri ate for use i n desig n. 16 9 8 1 seati ng plan e 0. 010 (0.25) 0.004 (0.10 ) 0.01 2 (0.3 0) 0.00 8 (0.2 0) 0.02 5 (0.6 4) bsc 0.04 1 (1. 04 ) ref 0.010 (0.25 ) 0. 006 (0.15) 0.050 (1.2 7) 0.016 (0.41 ) 0.020 (0.51 ) 0.01 0 (0.2 5) 8 0 coplanarit y 0.00 4 (0.1 0) 0.065 (1.65 ) 0.049 (1.25 ) 0.069 (1.75 ) 0.053 (1.35 ) 0. 197 (5.00) 0.1 93 (4. 90 ) 0.189 (4.80 ) 0.15 8 (4.0 1) 0.154 (3.91) 0.1 50 (3. 81 ) 0.244 (6.20 ) 0.236 (5.99) 0.228 (5. 79) 01-28- 2008- a ? 2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d11335 -0- 2/13(0) www.analog.com/ ADUM3190

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