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ha17431 series shunt regulators application note 2nd edition ade-504-004a ( z )
cautions 1. hitachi neither warrants nor grants licenses of any rights of hitachi? or any third party? patent, copyright, trademark, or other intellectual property rights for information contained in this document. hitachi bears no responsibility for problems that may arise with third party? rights, including intellectual property rights, in connection with use of the information contained in this document. 2. products and product specifications may be subject to change without notice. confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. hitachi makes every attempt to ensure that its products are of high quality and reliability. however, contact hitachi? sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. design your application so that the product is used within the ranges guaranteed by hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-safes, so that the equipment incorporating hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the hitachi product. 5. this product is not designed to be radiation resistant. 6. no one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from hitachi. 7. contact hitachi? sales office for any questions regarding this document or hitachi semiconductor products.
contents section 1 outline .............................................................................................. 1 1.1 features ......................................................................................................... 1 1.2 selection guide ............................................................................................... 2 1.3 pin arrangement by product .............................................................................. 3 section 2 specifications ................................................................................... 4 2.1 absolute maximum ratings .............................................................................. 4 2.2 electrical characteristics .................................................................................... 6 section 3 characteristics curves ...................................................................... 8 section 4 outline dimensions .......................................................................... 13 section 5 mpak-5 and upak marking patterns ............................................ 14 section 6 ordering information ........................................................................ 16 section 7 application examples ....................................................................... 17 7.1 application hints ............................................................................................ 18 7.2 design guide for ac-dc smps (switching mode power supply) ........................... 21 7.2.1 use of shunt regulator in transformer secondary side control ..................... 21 7.2.2 determination of external constants for the shunt regulator ........................ 21 7.2.3 practical example ................................................................................. 23 7.3 circuit example ac-dc smps ......................................................................... 24
hitachi 1 section 1 outline the ha17431 series is a family of voltage referenced shunt regulators. the main application of these products is in voltage regulators that provide a variable output voltage. the ha17431 series products are provided in a wide range of packages; to-92 and to-92mod insertion mounting packages and mpak-5, upak, and fp-8d surface mounting packages are available. the on-chip high-precision reference voltage source can provide 1% accuracy in the v versions, which have a v ka max of 16 volts. the ha17431vlp, which is provided in the mpak-5 package, is designed for use in switching mode power supplies. it provides a built-in photocoupler bypass resistor for the ps pin, and an error amplifier can be easily constructed on the supply side. 1.1 features the v versions provide 2.500 v 1% at ta = 25 c the ha17431vlp includes a photocoupler bypass resistor (2 k w ) the reference voltage has a low temperature coefficient the mpak-5 and upak miniature packages are optimal for use on high mounting density circuit boards a wide operating temperature range (e40 to +85 c) is provided by the to-92, to-92mod, and fp-8d package versions a + - ref k ps * 2 k w 2.500 v note: the ps pin is only provided by the ha17431vlp. figure 1.1 block diagram
2 hitachi 1.2 selection guide ha17431 item v version a version normal version package temp. range reference voltage accuracy 1% (at 25 c) 2.2% 4% max 2.525 v 2.550 v 2.595 v typ 2.500 v 2.495 v 2.495 v min 2.475 v 2.440 v 2.395 v cathode voltage 16 v max 40 v max 40 v max cathode current 50 ma max 150 ma max 150 ma max wide temperature use ha17431vpj ha17431pnaj to-92 ?0 to +85 c ha17431paj to-92mod ha17431pj to-92mod ha17431fpaj fp-8d ha17431fpj fp-8d industrial use ha17431vlp mpak-5 ?0 to +85 c ha17431vp ha17431pna to-92 ha17431upa upak ha17432upa upak ha17431pa to-92mod ha17431p to-92mod ha17431fpa fp-8d ha17431fp fp-8d commercial use ha17431ua upak ha17432ua upak
hitachi 3 1.3 pin arrangement by product product name package pin arrangement ha17431pa to-92mod ak r ha17431vp (2.5 v series) ha17431pna to-92 ak r ha17431ua ha17431upa upak ak r ha17432ua ha17432upa upak ar k ha17431vlp (2.5 v series) mpak-5 ak r ps nc ha17431fpa sop-8 r nc a nc k nc nc nc
4 hitachi section 2 specifications 2.1 absolute maximum ratings (ta = 25 c) item symbol ha17431vlp ha17431vp ha17431vpj unit notes cathode voltage v ka 16 16 16 v 1 ps term. voltage v ps v ka to 16 v 1, 2, 3 continuous cathode current i k ?0 to +50 ?0 to +50 ?0 to +50 ma reference input current iref ?.05 to +10 ?.05 to +10 ?.05 to +10 ma power dissipation p t 150* 4 500* 5 500* 5 mw 4, 5 operating temperature range topr ?0 to +85 ?0 to +85 ?0 to +85 c storage temperature tstg ?5 to +150 ?5 to +150 ?5 to +150 c item symbol ha17431p/pa ha17431fp/fpa ha17431ua/upa unit notes cathode voltage v ka 40 40 40 v 1 continuous cathode current i k ?00 to +150 ?00 to +150 ?00 to +150 ma reference input current iref ?.05 to +10 ?.05 to +10 ?.05 to +10 ma power dissipation p t 800* 6 500* 7 800* 8 mw 6, 7, 8 operating temperature range topr ?0 to +85 ?0 to +85 ?0 to +85 c storage temperature tstg ?5 to +150 ?5 to +125 ?5 to +150 c item symbol ha17431pj/paj ha17431fpj/fpaj unit notes cathode voltage v ka 40 40 v 1 continuous cathode current i k ?00 to +150 ?00 to +150 ma reference input current iref ?.05 to +10 ?.05 to +10 ma power dissipation p t 800* 6 500* 7 mw 6, 7 operating temperature range topr ?0 to +85 ?0 to +85 c storage temperature tstg ?5 to +150 ?5 to +125 c
hitachi 5 item symbol ha17432ua/upa ha17431pna ha17431pnaj unit notes cathode voltage v ka 40 40 40 v 1 continuous cathode current i k ?00 to +150 ?00 to +150 ?00 to +150 ma reference input current iref ?.05 to +10 ?.05 to +10 ?.05 to +10 ma power dissipation p t 800* 6 500* 5 500* 5 mw 5, 6 operating temperature range topr ?0 to +85 ?0 to +85 ?0 to +85 c storage temperature tstg ?5 to +150 ?5 to +150 ?5 to +150 c notes: 1. voltages are referenced to anode. 2. the ps pin is only provided by the ha17431vlp. 3. the ps pin voltage must not fall below the cathode voltage. if the ps pin is not used, the ps pin is recommended to be connected with the cathode. 4. ta 25 c. if ta > 25 c, derate by 1.2 mw/ c. 5. ta 25 c. if ta > 25 c, derate by 4.0 mw/ c. 6. ta 25 c. if ta > 25 c, derate by 6.4 mw/ c. 7. 50 mm 50 mm t 1.5 mm glass epoxy board, ta 25 c. if ta > 25 c, derate by 5 mw/ c. 8. 15 mm 25 mm t 0.7 mm alumina ceramic board, ta 25 c. if ta > 25 c, derate by 6.4?w/ c.
6 hitachi 2.2 electrical characteristics ha17431vlp/vp/vpj (ta = 25 c, i k = 10 ma) item symbol min typ max unit test conditions notes reference voltage vref 2.475 2.500 2.525 v v ka = vref reference voltage temperature deviation vref(dev) 10 mv v ka = vref ta = ?0 c to +85 c 1 reference voltage temperature coefficient d vref/ d ta 30 ppm/ cv ka = vref 0 c to 50 c gradient reference voltage regulation d vref/ d v ka 2.0 3.7 mv/v v ka = vref to 16 v reference input current iref 2 6 m a r1 = 10 k w , r2 = reference current temperature deviation iref(dev) 0.5 m a r1 = 10 k w , r2 = ta = ?0 c to +85 c minimum cathode current imin 0.4 1.0 ma v ka = vref 2 off state cathode current ioff 0.001 1.0 m av ka = 16 v, vref = 0 v dynamic impedance z ka 0.2 0.5 w v ka = vref i k = 1 ma to 50 ma bypass resistance r ps 1.6 2.0 2.4 k w i ps = 1 ma 3 bypass resistance temperature coefficient d r ps / d ta +2000 ppm/ ci ps = 1 ma 0 c to 50 c gradient 3
hitachi 7 ha17431pj/paj/fpj/fpaj/p/pa/ua/upa/fp/fpa/pna/pnaj, ha17432ua/upa (ta = 25 c, i k = 10 ma) item symbol min typ max unit test conditions notes reference voltage vref 2.440 2.495 2.550 v v ka = vref a 2.395 2.495 2.595 normal reference voltage temperature deviation vref(dev) 11 (30) mv v ka = vref ta = ?0 c to +85 c 1, 4 5 (17) ta = 0 c to +70 c 1, 4 reference voltage d vref/ d v ka 1.4 3.7 mv/v v ka = vref to 10 v regulation 1 2.2 v ka = 10 v to 40 v reference input current iref 3.8 6 m a r1 = 10 k w , r2 = reference current temperature deviation iref(dev) 0.5 (2.5) m a r1 = 10 k w , r2 = ta = 0 c to 70 c 4 minimum cathode current imin 0.4 1.0 ma v ka = vref 2 off state cathode current ioff 0.001 1.0 m av ka = 40 v, vref = 0 v dynamic impedance z ka 0.2 0.5 w v ka = vref i k = 1 ma to 100 ma notes: 1. vref(dev) = vref(max) ?vref(min) vref(dev) ta min ta max vref(max) vref(min) 2. imin is given by the cathode current at vref = vref (ik=10ma) ?15 mv. 3. r ps is only provided in ha17431vlp. 4. the maximum value is a design value (not measured).
8 hitachi section 3 characteristics curves ha17431vlp/vp/vpj 2.575 2.550 2.525 2.475 2.450 2.425 - 200 2040608085 ambient temperature ta ( c) reference voltage vref (v) ref reference voltage temperature characteristics 1.0 0.5 0 012345 cathode voltage v k (v) cathode voltage v k (v) cathode current i k (ma) cathode current i k (ma) cathode current vs. cathode voltage characteristics 1 cathode current vs. cathode voltage characteristics 2 2.500 v k =vref i k =10ma v k =vref k a i k v vref 50 0 - 50 - 50 5 v k =vref
hitachi 9 100 10 0.1 0.01 100 1k 10k 100k 1m frequency f (hz) dynamic impedance z ka ( w ) ref dynamic impedance vs. frequency characteristics 50 0 100 1k 100k 1m 10m frequency f (hz) open loop voltage gain g vol (db) open loop voltage gain, phase vs. frequency characteristics 1 k a v v k ref k a i k =10ma i o i o = 2ma p-p z ka = i o v k ( w ) phase delay ? (degrees) - 180 0 - 360 10k ? 220 w vo 15k w 8.2k w vi 10 m f - + g = 20log vi vo (db) g vol i k
10 hitachi ha17431pj/paj/fpj/fpaj/p/pa/ua/upa/fp/fpa oscillation stability vs. load capacitance between anode and cathode cathode current i k (ma) 150 100 50 0 0.0001 0.001 0.01 0.1 2.0 1.0 load capacitance c l ( m f) stable region oscillation region c l v cc 1.5 open loop voltage gain g vol (db) 0 10 20 30 40 50 60 open loop voltage gain, phase vs. frequency characteristics (1) (with no feedback capacitance) frequency f (hz) 10 100 1 k 10 k 100 k 180 90 0 phase f (degrees) phase f (degrees) 8.2 k w 15 k w 220 w gnd vout 10 m f vin f g v i k = 10 ma open loop voltage gain g vol (db) - 4 0 5 8 10 frequency f (hz) 10 100 1 k 10 k open loop voltage gain, phase vs. frequency characteristics (2) (when a feedback capacitance (cf) is provided) 360 180 270 50 w gnd 20 v vout + - 2 k 2.4 k w 7.5 k w vin 200 m f cf cf = 0.22 m f cf = 0.022 m f f g u g u i k = 5 ma
hitachi 11 reference voltage pin input current iref ( m a) 0.5 1.0 1.5 2.0 2.5 cathode voltage v k (v) 01520 10 52540 35 30 i k = 10 ma reference voltage pin input current vs. cathode voltage characteristics input/output voltage v i (v) 1 2 3 4 5 time t ( m s) 0 456 23 1 p.g f = 100 khz pulse response gnd vout 220 w 50 w output (vout) input (p.g) reference voltage vref (v) 2.44 2.45 2.46 2.47 2.48 v ka = vref i k = 10 ma 2.49 2.50 ambient temperature ta ( c) - 200 2040608085 reference voltage temperature characteristics
12 hitachi cathode current i k (ma) cathode voltage v k (v) - 10 - 2 123 - 100 - 80 - 60 - 40 - 20 0 20 40 60 80 100 120 150 cathode current vs. cathode voltage characteristics (1) v k = vref ta = 25 c cathode current i k (ma) cathode voltage v k (v) 123 0 0.2 0.4 0.6 0.8 1.0 1.2 cathode current vs. cathode voltage characteristics (2) v ka = vref ta = 25 c imin cathode current when off state ioff (na) ambient temperature ta ( c) - 200 2040608085 0.5 1 1.5 2 cathode current temperature characteristics when off state v ka = 40 v vref = 0 reference voltage pin input current iref ( m a) ambient temperature ta ( c) - 200 2040608085 0 0.5 1 1.5 2 2.5 r 1 = 10 k w r 2 = i k = 10 ma 3 reference voltage pin input current temperature characteristics
hitachi 13 section 4 outline dimensions 10 mm 10 mm ha17431vlp 10 mm 4.5 0.1 1.8 max 1.5 0.1 0.44 max 0.44 max 0.48 max 0.53 max 1.5 1.5 3.0 2.5 0.1 4.25 max 0.8 min f 1 0.4 (1.5) (2.5) (0.4) (0.2) 0.16 0 - 0.15 (0.95) (0.95) (0.6) (0.6) 1.1 + 0.2 - 0.1 ha17431ua/upa unit: mm ha17431fp/fpj/fpa/fpaj ha17431vp/vpj 1.9 2.9 0.2 0.4 0.1 0.4 0.1 0.4 0.1 0.4 0.1 2.8 + 0.2 - 0.3 (0.8) 1.6 + 0.2 - 0.1 0.10 0.40 0.06 10 mm 10 mm 0.42 0.08 1.27 0.15 ha17431p/pj/pa/paj 0.10 0.10 2.03 max 4.4 0.75 max 85 14 4.85 5.25 max 0.60 max 0.5 0.1 4.8 0.3 3.8 0.3 5.0 0.2 0.7 2.3 max 12.7 min 0.5 1.27 2.54 0.60 max 0.5 0.1 4.8 0.3 3.8 0.3 8.0 0.5 0.7 2.3 max 10.1 min 0.5 1.27 2.54 0.65 0.1 0.75 max
14 hitachi section 5 mpak-5 and upak marking patterns the marking patterns shown below are used on mpak-5 and upak products. note that the product code and mark pattern are different. the pattern is laser printed. (b) (2) (c) (4) (1) (a) p 4 ha17431vlp ha17431ua nc ps ref a k (3) (4) (1) (2) (5) band mark band mark ref aa k 4a ha17431upa (3) (4) (1) (2) (5) ref aa k 4b ha17432ua (3) (4) (1) (2) (5) band mark band mark k aa ref k a ref 4c ha17432upa (3) (4) (1) (2) (5) a 4f figure 5.1 mpak-5 and upak marking patterns notes: 1. boxes (1) to (5) in the figures show the position of the letters or numerals, and are not actually marked on the package. 2. the letters (1) and (2) show the product specific mark pattern. product (1) (2) ha17431vlp 4 p ha17431ua 4 a ha17431upa 4 b product (1) (2) ha17432ua 4 c ha17432upa 4 f
hitachi 15 3. the letter (3) shows the production year code (the last digit of the year) for upak products. 4. the bars (a), (b) and (c) show a production year code for mpak-5 products as shown below. after 2005 the code is repeated every 8 years. year 1997 1998 1999 2000 2001 2002 2003 2004 (a) bar bar bar bar none none none none (b) none none bar bar none none bar bar (c) none bar none bar none bar none bar 5. the letter (4) shows the production month code (see table below). production month jan feb mar apr may jun jul aug sep oct nov dec marked code a b c d e f g h j k l m 6. the letter (5) shows manufacturing code for upak products.
16 hitachi section 6 ordering information taping specifications must be attached after the product name. the quantity must be a multiple of ordering unit (see table below). ha17431vlp-el 15,000pcs quantity taping code product name ex. table 6.1 taping specifications package taping code packing ordering unit illustration mpak-5 el embossed taping l type in 180 f reel 3000 pcs 4.0 feed direction 8.0 upak tl embossed taping l type in 180 f reel 1000 pcs 8.0 12.0 feed direction to-92 to-92mod tz fan-folded taping in 336 262 47 mm 3 box (to-92), fan-folded taping in 330 200 43 mm 3 box (to-92mod) 2500 pcs 12.7 back adhesive tape 18.0 fp-8d el embossed taping l type in 330 f reel 2500 pcs 8.0 12.0 feed direction
hitachi 17 section 7 application examples as shown in the figure below, this ic operates as an inverting amplifier, with the ref pin as an input pin. the open-loop voltage gain is given by the reciprocal of ?eference voltage deviation by cathode voltage change?in the electrical specifications, and is approximately 50 to 60 db. the ref pin has a high input impedance, with an input current iref of 3.8 m a typ (v version: iref = 2 m a typ). the output impedance of the output pin k (cathode) is defined as dynamic impedance z ka , and z ka is low (0.2 w ) over a wide cathode current range. a (anode) is used at the minimum potential, such as ground. k v cc out v ee a ref v z @ 2.5v - + figure 7.1 operation diagram
18 hitachi 7.1 application hints no. application example description 1 reference voltage generation circuit k r c l vout gnd vin gnd ref a this is the simplest reference voltage circuit. the value of the resistance r is set so that cathode current i k 3 1 ma. output is fixed at vout @ 2.5 v. the external capacitor c l (c l 3 3.3 m f) is used to prevent oscillation in normal applications. 2 variable output shunt regulator circuit k r c l vout gnd vin gnd a r 1 r 2 ref iref this is circuit 1 above with variable output provided. vout @ 2.5 v here, (r 1 + r 2 ) r 2 since the reference input current iref = 3.8 m a typ (v version: iref = 2 m a typ) flows through r 1 , resistance values are chosen to allow the resultant voltage drop to be ignored. 3 single power supply inverting comparator circuit k vout gnd vin gnd a ref v cc r l rin this is an inverting type comparator with an input threshold voltage of approximately 2.5 v. rin is the ref pin protection resistance, with a value of several k w to several tens of k w . r l is the load resistance, selected so that the cathode current i k 3 1 ma when vout is low. condition c1 c2 vin less then 2.5 v 2.5 v or more vout v cc (v oh ) approx. 2 v (v ol ) ic off on
hitachi 19 no. application example description 4 ac amplifier circuit gnd k vout vin ref a v cc r l r 1 r 2 r 3 cin cf gain g = (dc gain) r 1 r 2 // r 3 cutoff frequency fc = 1 2 p cf (r 1 // r 2 // r 3 ) this is an ac amplifier with voltage gain g?r 1 / (r 2 //r 3 ). the input is cut by capacitance cin, so that the ref pin is driven by the ac input signal, centered on 2.5 v dc . r 2 also functions as a resistance that determines the dc cathode potential when there is no input, but if the input level is low and there is no risk of vout clipping to v cc , this can be omitted. to change the frequency characteristic, cf should be connected as indicated by the dotted line. 5 switching power supply error amplification circuit + - v + v - r 1 r 2 r 3 r 4 led cf secondary side gnd (note) note: led: r 3 : r 4 : light emitting diode in photocoupler bypass resistor to feed i k (>imin) when led current vanishes led protection resistance this circuit performs control on the secondary side of a transformer, and is often used with a switching power supply that employs a photocoupler for offlining. the output voltage (between v+ and v? is given by the following formula: vout @ 2.5 v (r 1 + r 2 ) r 2 in this circuit, the gain with respect to the vout error is as follows: g = r 2 (r 1 + r 2 ) ha17431 open loop gain photocoupler total gain as stated earlier, the ha17431 open-loop gain is 50 to 60 db. 6 constant voltage regulator circuit gnd v cc r 1 r 2 r 3 cf q vout gnd this is a 3-pin regulator with a discrete configuration, in which the output voltage vout = 2.5 v (r 2 + r 3 ) r 3 . r 1 is a bias resistance for supplying the ha17431 cathode current and the output transistor q base current.
20 hitachi no. application example description 7 discharge type constant current circuit gnd v cc r r s q load 2.5 v + - i l this circuit supplies a constant current of i l @ [a] 2.5 v r s into the load. caution is required since the ha17431 cathode current is also superimposed on i l . the requirement in this circuit is that the cathode current must be greater than imin = 1 ma. the i l setting therefore must be on the order of several ma or more. 8 induction type constant current circuit gnd v cc r q load 2.5 v + - i l r s in this circuit, the load is connected on the collector side of transistor q in circuit 7 above. in this case, the load floats from gnd, but the ha17431 cathode current is not superimposed on i l , so that i l can be kept small (1 ma or less is possible). the constant current value is the same as for circuit 7 above: i l @ [a] 2.5 v r s
hitachi 21 7.2 design guide for ac-dc smps (switching mode power supply) 7.2.1 use of shunt regulator in transformer secondary side control this example is applicable to both forward transformers and flyback transformers. a shunt regulator is used on the secondary side as an error amplifier, and feedback to the primary side is provided via a photocoupler. r 1 r 2 r 3 r 4 transformer photocoupler light emitting diode phototransistor output c 1 r 5 ref gnd a k v k i b i f ha17431 v f sbd pwm ic ha17384 ha17385 vref v 0 (+) ( - ) figure 7.2 typical shunt regulator/error amplifier 7.2.2 determination of external constants for the shunt regulator dc characteristic determination: in figure 7.2, r 1 and r 2 are protection resistor for the light emitting diode in the photocoupler, and r2 is a bypass resistor to feed i k minimum, and these are determined as shown below. the photocoupler specification should be obtained separately from the manufacturer. using the parameters in figure 7.2, the following formulas are obtained: r 1 = v 0 - v f - v k i f + i b , r 2 = v f i b v k is the ha17431 operating voltage, and is set at around 3 v, taking into account a margin for fluctuation. r 2 is the current shunt resistance for the light emitting diode, in which a bias current i b of around 1/5 i f flows. next, the output voltage can be determined by r 3 and r 4 , and the following formula is obtained: v 0 = r 3 + r 4 r 4 vref, vref = 2.5 v typ
22 hitachi the absolute values of r 3 and r 4 are determined by the ha17431 reference input current iref and the ac characteristics described in the next section. the iref value is around 3.8 m a typ. (v version: 2 m a typ) ac characteristic determination: this refers to the determination of the gain frequency characteristic of the shunt regulator as an error amplifier. taking the configuration in figure 7.2, the error amplifier characteristic is as shown in figure 7.3. when r 5 = 0 when r 5 0 g 1 f 1 f ac f 2 g 2 f osc frequency f (hz) gain g (db) * f osc : pwm switching frequency figure 7.3 ha17431 error amplification characteristic in figure 7.3, the following formulas are obtained: gain g 1 = g 0 ? 50 db (determined by shunt regulator) g 2 = r 5 r 3 corner frequencies f 1 = 1/(2 p c 1 g 0 r 3 ) f 2 = 1/(2 p c 1 r 5 ) g 0 is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation d vref/ d v ka , and is approximately 50 db.
hitachi 23 7.2.3 practical example consider the example of a photocoupler, with an internal light emitting diode v f = 1.05 v and i f = 2.5 ma, power supply output voltage v 2 = 5 v, and bias resistance r 2 current of approximately 1/5 i f at 0.5 ma. if the shunt regulator v k = 3 v, the following values are found. r 1 = 5v - 1.05v - 3v 2.5ma + 0.5ma = 317( w ) (330 w from e24 series) r 2 = 1.05v 0.5ma = 2.1(k w ) (2.2k w from e24 series) next, assume that r 3 = r 4 = 10 k w . this gives a 5 v output. if r 5 = 3.3 k w and c 1 = 0.022 m f, the following values are found. g 2 = 3.3 k w / 10 k w = 0.33 times (?0 db) f 1 = 1/(2 p 0.022 m f 316 times 10 k w ) = 2.3 (hz) f 2 = 1/(2 p 0.022 m f 3.3 k w ) = 2.2 (khz)
24 hitachi 7.3 circuit example ac-dc smps photocoupler commercial ac 100v rectifier bridge diode line filter 100 m 200v 1000 m 10v r t 10k 220k 1/4w 22 m 50v v in 16.4v 141v 0.1 m 51 1k 4.7k - + b p s 1s2076a dc 5v, 3a output vref v in out gnd comp fb ha17384 ha17385 ha17431 2sk1567 sbd hrp24 cs r t /c t + - + - + - + - 1.8k b 4.7k 1 2w 100p 150k 330p c t 1000p transformer specification example ei-22 type core (h7c18 06z) gap length lg = 0.3mm transformer coil example p: 0.5 f 80t/570 m h s: 0.5 f 16t bifiler/22 m h b: 0.2 f 44t/170 m h 330 3.3 m 2k + - figure 7.4 circuit example ac-dc smps
ha17431 series shunt regulators application note publication date: 1st edition, july 1997 2nd edition, august 1999 published by: electronic devices business group hitachi, ltd. edited by: technical documentation group ul media co., ltd. co py ri g ht hitachi, ltd., 1997. all ri g hts reserved. printed in ja p an.
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