1 description ltc 3630aemse/ ltc 3630emse high efficiency high voltage 500ma synchronous step-down converter demonstration circuit 2105 a is a 500 ma output dc/dc power supply. there are two versions: dc2105a-a is a board featuring lt c ? 3630a , with 4 v to 76 v input range; dc2105a-b is a board featuring ltc3630, with 4 v to 65v input range. the ltc3630a/ltc3630 operates in a high efficiency burst mode ? operation and includes internal high and low side switches. the board provides jumper selected output voltages of 1.8v, 3.3v, 5 v and an option for additional voltages. ltc3630a/ltc3630 has internal soft-start and a provision for increasing soft-start time. included on the board is an on/off jumper that can also be configured as a precision undervoltage lockout. ad - ditional pc pads are included for programming current limit to optimize efficiency and for reducing output voltage 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 ripple and reducing component size. a terminal (fbo) is available to allow multiple boards to be paralleled for increasing output current. output voltage between 800 mv and v in can be pro- grammed using optional resistors, although higher voltage output capacitors will be required. the ltc3630a/ltc3630 data sheet gives a complete de- scription of the operation and application information. the data sheet must be read in conjunction with this demo manual. design files for this circuit board are available at http://www . linear.com/demo/dc2105a specifications are at t a = 25c parameter condition value input voltage range for dc2105a-a ltc3630a 4v to 76v input voltage range for dc2105a-b ltc3630 4v to 65v 1.8v output v in = 20v, v out load = 100ma 1.8v 2% 3.3v output v in = 20v, v out load = 100ma 3.3 v 2% 5v output v in = 20v, v out load = 100ma 5v 2% maximum output current v in = 20v, v out = 5v 500ma typical output voltage ripple v in = 20v, v out = 5v 75mv p-p dc2105af demo manual dc2105a
2 quick s tart p roce d ure this dc2105a can be evaluated using the setup shown in figure 1. 1. connect the dvms to the input and output. select 5v setting using jumper jp 1 ( lower position) and jp2 (upper position), select on position for jp3. 2. with input power supply set for 0 v, connect the sup - ply to v in and gnd terminals using short ( less than 10 inches) leads, preferably twisted leads. connect a suitable load to v out and gnd terminals. 3. slowly increase the input power supply to 10 v. observe output voltage and verify that it meets the specifications in the performance summary. measure output voltage with and without the load. 4. move jumpers jp1 and jp2 to the other two fixed volt - age settings and verify that each output voltage meets the values as shown in the per formance summary. 5. once the proper output voltages are established, adjust the load and input voltage within the operating range and observe the output voltage regulation, ripple volt - age and other parameters. notes : 1. important : 60 v or higher voltage can result in an electric shock if care is not taken. also, hot plugging the circuit to a power supply that has more than 40v present at its output can produce a high voltage tran- sient exceeding the absolute maximum input voltage which can damage the ltc3630a/ltc3630. 2. when measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. measure the input or output voltage ripple by touching the probe tip directly across the v in or v out and gnd terminals. see figure 3 for proper scope probe technique. figure 1. proper measurement equipment setup note: a 10f, 100v electrolytic capacitor is necessary when evaluating circuit with input voltages greater than 40v, using long input wires and hot plugging circuit into a powered input supply. see figure 2. dc2105af demo manual dc2105a
3 quick s tart p roce d ure circuit options detailed information is contained in the data sheet. optional output voltage: additional output voltages can be programmed by selecting proper resistors for the r6 and r7 feedback network. c5 is a feed-forward capacitor to optimize transient response and increase stability. jp1 and jp2 must be in the lower position if r6 and r7 are used. the 10 v rated output capacitors must be replaced with suitable voltage ratings. iset components: c3, r3 and r4 are used to provide a number of features and circuit enhancements such as, output current limit, input current limit, optimizing out - put ripple voltage reduction and efficiency improvement. r4 sets maximum output current, see figure 2 in the ltc3630a/ltc3630 data sheet, leave open for maximum load current. r3 and r4 can be used to set input current limit. c3 is used to reduce output voltage ripple and op - timize efficiency. see data sheet for details. run pin components: the converter is enabled when the run pin voltage exceeds 1.21 v and is disabled when dropping below 0.7 v. moving jp3 to the on position al - lows an internal current to pull the run pin up to 5 v. r1 and r2 are used to program input undervoltage lockout. select suitable resistors to divide the input voltage down to the precision threshold voltage levels that enable and disable the converter. note that the maximum voltage on the run pin is 6 v, therefore a nominal 5 v zener diode (d1) is required to limit the run pin voltage when high input voltages are used. 20s/div 0 v in (v) 40 60 70 80 30 20 10 50 dc2105a f02 twisted with 10f aluminum electrolytic twisted leads v in = 50v non-twisted leads figure 2. hot plugging input voltage transient using 12" leads figure 3. measuring input or output voltage ripple load current (a) 50 efficiency (%) 70 90 100 60 80 dc2105a f04a 1 0.001 0.0001 0.01 0.1 12v in 36v in 65v in 76v in 1.8v out load current (a) 50 efficiency (%) 70 90 100 60 80 dc2105a f04b 1 0.001 0.0001 0.01 0.1 12v in 36v in 65v in 76v in 3.3v out load current (a) 50 efficiency (%) 70 90 100 60 80 dc2105a f04c 1 0.001 0.0001 0.01 0.1 12v in 36v in 65v in 76v in 5v out figure 4. efficiency vs load current curves dc2105af demo manual dc2105a
4 p arts list dc2105a-a item qty reference part description manufacturer/ part number required circuit components 1 1 c1 cap, 0805 220nf 10% 100v x7r murata grm21ar72a224kac5l 2 1 c2 cap, 2220 4.7f 20% 100v x7r tdk c5750x7r2a475m 3 1 c3 cap, 0603 220pf 10% 50v x7r avx 06035c221 kat 2a 4 1 c4 cap, 0603 47nf 10% 25v x7r avx 06033c473 kat 5 2 c6, c7 cap, 1210 100f 20% 10v x5r taiyo yuden lmk325abj107mm-t 6 1 c9 cap, 0603 0.1f 10% 25v x7r avx 06033c104 kat 2a 7 1 l1 ind, 68h sumida cdrh105rnp-680n 8 1 r4 res, 0603 220k 5% 1/10w vishay crcw0603220kjnea 9 1 r5 res, 0805 4.7 5% 1/8w vishay crcw08054r70jnea 10 1 r6 res, 0603 0 jumper vishay crcw06030000z0ea 11 1 u1 ic, synchronous step-down converter linear tech. LTC3630AEMSE additional demo board circuit components 1 0 c5 cap, 0603 option option 2 0 c8, c10, c11 cap, 1210 option option 3 0 d1 diode, option option 4 0 r1, r2, r3, r7 res, 0603 option option hardware 1 6 e1, e2, e3, e4, e5, e6 turret mill max 2501-2-00-80-00-00-07-0 2 3 jp1, jp2, jp3 header, 3 pin, 2mm samtec tmm-103-02-l-s 3 3 jp1, jp2, jp3 shunt, 2mm samtec 2sn-bk-g dc2105af demo manual dc2105a
5 p arts list dc2105a-b item qty reference part description manufacturer/ part number required circuit components 1 1 c1 cap, 0805 220nf 10% 100v x7r murata grm21ar72a224kac5l 2 1 c2 cap, 2220 4.7f 20% 100v x7r tdk c5750x7r2a475m 3 1 c3 cap, 0603 220pf 10% 50v x7r avx 06035c221 kat 2a 4 1 c4 cap, 0603 47nf 10% 25v x7r avx 06033c473 kat 5 2 c6, c7 cap, 1210 100f 20% 10v x5r taiyo yuden lmk325abj107mm-t 6 1 c9 cap, 0603 0.1f 10% 25v x7r avx 06033c104 kat 2a 7 1 l1 ind, 68h sumida cdrh105rnp-680n 8 1 r4 res, 0603 220k 5% 1/10w vishay crcw0603220kjnea 9 1 r5 res, 0805 4.7 5% 1/8w vishay crcw08054r70jnea 10 1 r6 res, 0603 0 jumper vishay crcw06030000z0ea 11 1 u1 ic, synchronous step-down converter linear tech. ltc3630emse additional demo board circuit components 1 0 c5 cap, 0603 option option 2 0 c8, c10, c11 cap, 1210 option option 3 0 d1 diode, option option 4 0 r1, r2, r3, r7 res, 0603 option option hardware 1 6 e1, e2, e3, e4, e5, e6 turret mill max 2501-2-00-80-00-00-07-0 2 3 jp1, jp2, jp3 header, 3 pin, 2mm samtec tmm-103-02-l-s 3 3 jp1, jp2, jp3 shunt, 2mm samtec 2sn-bk-g dc2105af demo manual dc2105a
6 s chematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a bb b b a a aa on off 2 vin 4v - 76v gnd fbo vout 1.8v/3.3v/5v 500ma gnd 2 2 ba 1. all resistors and capacitors are 0603. note: unless otherwise specified jp1 jp2 vout ba 1.8v 3.3v 5.0v ext. r gnd 2 3 1 1 1 3 3 2 2 vin vout vin vout ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? 1 04/16/13 12:29:21 11 high efficiency, 76v, 500ma synchronous mi charlie z. n/a LTC3630AEMSE demo circuit 2105a-a step-down converter ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? 1 04/16/13 12:29:21 11 high efficiency, 76v, 500ma synchronous mi charlie z. n/a LTC3630AEMSE demo circuit 2105a-a step-down converter ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? 1 04/16/13 12:29:21 11 high efficiency, 76v, 500ma synchronous mi charlie z. n/a LTC3630AEMSE demo circuit 2105a-a step-down converter revision history description date approved eco rev charlie z. prod 1 04/12/13 revision history description date approved eco rev charlie z. prod 1 04/12/13 revision history description date approved eco rev charlie z. prod 1 04/12/13 jp1 jp1 r2 opt r2 opt r7 opt r7 opt e6 e6 e2 e2 c10 opt 1210 c10 opt 1210 r4 220k r4 220k jp3 jp3 e3 e3 c9 0.1uf c9 0.1uf jp2 jp2 c11 opt 1210 c11 opt 1210 c4 47nf c4 47nf l1 68uh sumida cdrh105 l1 68uh sumida cdrh105 c1 220nf 100v 0805 c1 220nf 100v 0805 r5 4.7 0805 r5 4.7 0805 c7 100uf 10v 1210 c7 100uf 10v 1210 u1 LTC3630AEMSE u1 LTC3630AEMSE sw 1 vin 3 fbo 12 vprg1 7 vprg2 6 gnd 8 vfb 9 ss 10 iset 11 gnd 14 run 5 gnd 16 gnd 17 e5 e5 r6 0 r6 0 r1 opt r1 opt c5 opt c5 opt c3 220pf c3 220pf e1 e1 d1 opt d1 opt r3 opt r3 opt c6 100uf 10v 1210 c6 100uf 10v 1210 e4 e4 c8 opt 1210 c8 opt 1210 c2 4.7uf 100v 2220 c2 4.7uf 100v 2220 dc2105af demo manual dc2105a
7 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 bb b b a a aa on off 2 vin 4v - 65v gnd fbo vout 1.8v/3.3v/5v 500ma gnd 2 2 ba 1. all resistors and capacitors are 0603. note: unless otherwise specified jp1 jp2 vout ba 1.8v 3.3v 5.0v ext. r gnd 2 3 1 1 1 3 3 2 2 vin vout vin vout ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? 1 04/16/13 12:30:01 11 high efficiency, 65v, 500ma synchronous mi charlie z. n/a ltc3630emse demo circuit 2105a-b step-down converter ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? 1 04/16/13 12:30:01 11 high efficiency, 65v, 500ma synchronous mi charlie z. n/a ltc3630emse demo circuit 2105a-b step-down converter ???? ????? ?????? ???? ????? ?? ?????? ????????? ???????? ???????? technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ?????????????????????????????????????? ??????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ???????????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????????????????????????????????????????? ????????????????????????????????????????????????????? ??????????????????????????????????????????? ??????????????????????????????????????????????????? ???????????????????????????????????????????????????? ????????? ?????????????????????????????????????????????? ???????????? ?????????????? 1 04/16/13 12:30:01 11 high efficiency, 65v, 500ma synchronous mi charlie z. n/a ltc3630emse demo circuit 2105a-b step-down converter revision history description date approved eco rev charlie z. prod 1 04/12/13 revision history description date approved eco rev charlie z. prod 1 04/12/13 revision history description date approved eco rev charlie z. prod 1 04/12/13 jp1 jp1 r2 opt r2 opt r7 opt r7 opt e6 e6 e2 e2 c10 opt 1210 c10 opt 1210 r4 220k r4 220k jp3 jp3 e3 e3 c9 0.1uf c9 0.1uf jp2 jp2 c11 opt 1210 c11 opt 1210 c4 47nf c4 47nf l1 68uh sumida cdrh105 l1 68uh sumida cdrh105 c1 220nf 100v 0805 c1 220nf 100v 0805 r5 4.7 0805 r5 4.7 0805 c7 100uf 10v 1210 c7 100uf 10v 1210 u1 ltc3630emse u1 ltc3630emse sw 1 vin 3 fbo 12 vprg1 7 vprg2 6 gnd 8 vfb 9 ss 10 iset 11 gnd 14 run 5 gnd 16 gnd 17 e5 e5 r6 0 r6 0 r1 opt r1 opt c5 opt c5 opt c3 220pf c3 220pf e1 e1 d1 opt d1 opt r3 opt r3 opt c6 100uf 10v 1210 c6 100uf 10v 1210 e4 e4 c8 opt 1210 c8 opt 1210 c2 4.7uf 100v 2220 c2 4.7uf 100v 2220 dc2105af demo manual dc2105a
8 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2013 lt 0713 ? printed in usa demonstration board important notice linear technology corporation ( lt c ) 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 lt c 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 p arty 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 lt c 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 whatsoever. lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c 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 lt c applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2105af demo manual dc2105a
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