1 description LT8315 offline isolated flyback converter demonstration circuit 2337a is an offline isolated flyback converter featuring lt ? 8315. the demo board outputs 12v, and maintains tight regulation with a load current from 4ma to 0.55a. it is optimized to operate over a wide ac input voltage range (90vac to 265vac, 47hz to 63hz). output voltage accuracy stays within 5% over the whole input voltage and load range. the LT8315 is a high voltage flyback converter with inte - grated 630v /300ma switch. no opto-isolator is needed for regulation. the part samples the output voltage from the isolated flyback waveform appearing across a third wind - ing on the transformer. quasi-resonant boundary mode l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. p erformance s ummary operation improves load regulation, reduces transformer size, and maintains high efficiency. the LT8315 is available in a thermally enhanced 20-pin tssop package with four pins removed for high voltage spacing. the LT8315 data sheet gives a complete description of the part, operation and application information. the data sheet must be read in conjunction with this quick start guide for demo circuit 2337a. design files for this circuit board are available at http://www.linear.com/demo/dc2337a specifications are at t a = 25c parameter conditions min typ max units input voltage 90 265 v rms output voltage i out = 4ma to 0.55a 11.4 12 12.6 v maximum output current 0.55 a typical switching frequency v in = 120vac, i out = 0.55a v in = 220vac, i out = 0.55a 65 89 khz khz efficiency v in = 120vac, i out = 0.55a v in = 220vac, i out = 0.55a 85.0 84.6 % % dc2337af demo manual dc2337a
2 quick s tart p roce d ure i mportant note to customers: high voltages are presented on the demo circuit, and can lead to lethal injuries to human body. only qualified personnel should operate it. it is strongly recommended to use safety glasses and an isolation transformer. note. improper components replacement on the demo circuit can cause performance deteriora - tions, circuit malfunction, property damage, and even life-threa tening injuries. cont act linear technology applications engineers for proper component replacement. demonstration circuit 2337a is easy to set up to evalu - ate the performance of the LT8315. refer to figure 1 for proper measurement equipment setup and follow the procedure below : 1. with power off, connect the ac input power supply to the board through line and neutral terminals. connect the load to the terminals v out + and v out C on the board. 2. turn on the power at the input. set the input voltage to 120vac. note : make sure that the input voltage is always within spec. to operate the board with higher input/output voltage, input capacitor, output capacitor and output diode with higher voltage ratings are needed. 3. check for the proper output voltages. the output should be regulated at 12v (5%). note : the LT8315 requires very small minimum load to maintain good output voltage regulation. a zener diode is placed on the output to clamp the voltage to 13v. this zener can be replaced with a 3000 resistor at the trade-off of lower efficiency. 4. once the proper output voltage is established, adjust the input voltage and load current within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. note : when measuring the input or output voltage ripples, care must be taken to avoid a long ground lead on the oscilloscope probe. measure the output voltage ripple by touching the probe tip directly across the v out + and v out C terminals. figure 1. proper measurement equipment setup dc2337af demo manual dc2337a
3 quick s tart p roce d ure figure 2. efficiency vs load current figure 4. 120vac steady state switch node voltage at full load condition figure 3. load and line regulation figure 5. 220vac steady state switch node voltage at full load condition dc2337af demo manual dc2337a 300 400 500 600 50 55 60 65 70 75 90vac 80 85 90 efficiency (%) dc2337a f02 90vac 120vac 220vac 265vac load current (ma) 120vac 0 100 200 300 400 500 600 11.8 11.9 12.0 220vac 12.1 12.2 output voltage (v) dc2337a f03 5s/div dc2337a f04 v sw 100v/div 5s/div dc2337a f05 v sw 100v/div 265vac load current (ma) 0 100 200
4 p arts list item qty reference part description manufacturer/part number required circuit components 1 1 b1 rectifier, bridge gp 600v 0.8a diodes inc, hd06-t 2 2 c1, c2 cap, alum, 10f, 400v, 20% nichion, uvc2g100mpd 3 2 c3, c9 cap, x7r, 10f, 50v, 10%, 1210 murata, grj32ec71h106ke11l 4 1 c4 cap, np0, 47pf, 50v, 5%, 0603 avx, 06035a470jat2a 5 1 c5 cap, np0, 22f, 50v, 5%, 0603 avx, 06035a220jat2a 6 1 c6 cap, x7r, 0.082f, 25v, 10%, 0603 murata, grm188r71e823ka01d 7 1 c10 cap, y5u 2200pf 500vac 20% vishay, 440ld22-r 8 1 c12 cap, alum, 560f, 16v, 20% panasonic, 16sepf560m 9 1 d1 diode, zener, 13v, sod123 central semi, cmhz5243b 10 1 d2 diode, 150v, sod323 diodes inc, bav20ws-7-f 11 1 d3 diode, 800v, sod123f central semi, cmmr1u-08 12 1 d4 diode, tvs, sma littlefuse, smaj200a 13 1 d5 diode, schottky, 100v, power-di-123 diodes inc, dfls2100-7 14 1 f1 fuse, 3.15a eaton bussmann, ss-5h-3.15a 15 1 l1 ind, 10h, 1008 tdk, mlp2520s100s 16 1 l2 ind, 330h wurth elektronic, 744731331 17 1 rt1 icl, 10, 700ma, 20%, 7mm cantherm, mf72-010d5 18 1 r1 res, chip, 215, 1/10w, 1% 0603 vishay, crcw0603215rfkea 19 1 r2 res, chip, 59k, 1/10w, 1% 0603 vishay, crcw060359k0fkea 20 1 r3 res, chip, 20k, 1/10w, 1% 0603 vishay, crcw060320k0fkea 21 1 r4 res, chip, 0, 1/10w, 1% 0603 vishay, crcw06030000z0ea 22 1 r6 res, chip, 100k, 1/10w, 1% 0603 vishay, crcw0603100kfkea 23 1 r7 res, sense, 0.33, 1/3w, 1% 0805 susumu, rl1220s-r33-f 24 1 r9 res, chip, 95.3k, 1/10w, 1% 0603 vishay, crcw060395k3fkea 25 1 r10 res, chip, 5.05k, 1/10w, 1% 0603 vishay, crcw06035k05fkea 26 1 t1 transformer sumida, ps16-051 27 1 u1 ic, LT8315efe, tssop20fe linear, LT8315efe#pbf additional demo board circuit components 1 0 r5, r8, r11 res, option, 0603 2 0 c7 cap, option, 0603 3 0 c8 cap, option, 1206 4 0 c11 cap, option, 1210 hardware: for demo board only 1 1 xjp1 shunt, 0.079" center samtec, 2sn-bk-g 2 2 j1, j2 conn, term block, 5mm, 2pos weidmuller, 1715250000 3 1 jp1 3 pin 0.079 single row header sullins, nrpn031paen-rc dc2337af demo manual dc2337a
5 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. s chematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 1. all resistors are 0603. all capacitors are 0603. note: unless otherwise specified l n intvcc intvcc size date: ic no. rev. sheet of title: technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. www.linear.com 3 demo circuit 2337a wednesday, january 04, 2017 1 1 off-line no-opto n/a LT8315efe isolated flyback converter size date: ic no. rev. sheet of title: technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. www.linear.com 3 demo circuit 2337a wednesday, january 04, 2017 1 1 off-line no-opto n/a LT8315efe isolated flyback converter size date: ic no. rev. sheet of title: technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. www.linear.com 3 demo circuit 2337a wednesday, january 04, 2017 1 1 off-line no-opto n/a LT8315efe isolated flyback converter j2 1715250000 +vout -vout 12v/0.55a 2 1 d1 cmhz5243b r1 215 c11 opt 1210 c6 82nf LT8315efe u1 drain 1 drain 2 drain 3 intvcc 8 vin 9 dcm 10 tc 11 fb 12 vc 13 ireg/ss 14 gnd 15 smode 16 en/uvlo 17 source 18 nc 19 gnd 20 gnd 21 c10 2200pf jp1 disen standby mode 1 2 3 j1 90v - 265vac 1715250000 2 1 d4 smaj200a l2 330uh 744731331 + c12 560uf 16v 16sepf560m c5 22pf f1 3.15a r10 5.05k d2 bav20ws-7-f d3 cmmr1u-08 d5 dfls2100 r9 95.3k r4 0 c7 opt r5 opt t1 ps16-051 sumida 10 12 6 4 1 3 + c2 10uf 400v uvc2g100mpd c3 10uf 50v 1210 r6 100k r2 59k c4 47pf l1 10uh mlp2520s100s rt1 mf72-010d5 r7 0.33 0805 r11 opt - + b1 0.8a 600v 2 1 3 4 + c1 10uf 400v uvc2g100mpd r3 20k r8 opt c8 opt 1206 c9 10uf 50v 1210 dc2337af demo manual dc2337a
6 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2017 lt 0117 ? printed in usa demonstration board important notice linear technology corporation (ltc) provides the enclosed product(s) under the following as is conditions: this demonstration board (demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by ltc for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither party shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases ltc from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoeve r. ltc assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. ltc currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. please read the demo board manual prior to handling the product. persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged. this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a ltc application engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2337af demo manual dc2337a
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