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(888) 597-wall www.wallindustries.com 1 of 15 technical datasheet JF24S15-1000 dc/dc converter 18-36 vdc input 15 vdc output at 1.0a applications: ? distributed power architectures ? communication equipment ? computer equipment ? test equipment options: ? positive remote on/off ? on/off control function ? trim function ? surface mount features: ? rohs directive compatible ? low profile: 1.10 x 0.94 x 0.335 inches ? industry standard pin-out ? 2:1 wide input voltage of 18-36, 36-75vdc ? 15 watts output power ? over-current protection, auto-recovery ? output over voltage protection ? under voltage lockout ? remote on/off control ? adjustable output voltage ? iso 9001 certified manu facturing facilities ? ul60950-1 ? tuv en60950-1 ? cb ? ce mark ? input to output isolation: 2250vdc, min ? approved for basic insulation description: jf series single output dc/dc converters provide up to 15 wa tts of output power in an industry standard package and footprint. these units are specifically designed to meet the pow er needs of low profile. all models feature a wide input range, comprehensively protected against over-current, over- voltage, and input under-voltage protection conditions, and trimmable output voltage. the jf series converters are esp ecially suited to network, data processing, wireless and enterprise equipment and microprocessor, inte rmediate bus voltage power application. ul tuv cb ce mark
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 2 of 15 technical specifications m m o o d d e e l l n n o o . . JF24S15-1000 all specifications are based on 25 o c, nominal input voltage and maximum ou tput current unless otherwise noted. we reserve the right to change speci fications based on te chnological advances. specification related condition min nom max unit switching frequency test at nominal vin and full load - 470 - khz input (v in ) operating voltage range 18 24 36 vdc uvlo turn-on threshold 17 vdc uvlo turn-off threshold 14.5 vdc input surge voltage (100ms max) -0.3 50 vdc input voltage variation complies w ith est300 132 part 4.4 5 v/ms input current full load 762 ma reflected ripple current please see th e test setup section (pg 9) 30 ma pk-pk efficiency test at nominal vin and full load (please see the test setup section ? pg 9) 87 % output (v o ) operating output range 14.85 -1% 15 15.15 +1% vdc voltage adjustment please see the external trim adjustment section (pg 6) 13.5 -10% 15 16.5 +10% vdc load regulation 0% to 100% full load 0.2 % line regulation ll to hl at full load 0.2 % output ripple & noise 1uf ceramic & 10uf tantal um at 20mhz bandwidth (please see the test setup section - pg 9) 100 mv pk-pk transient response 50% to 75% to 50% load change, ? io / ? t = 0.1a/s 300 s output current 0 1.0 a output voltage overshoot 3 % output capacitor load 220 f over current protection 1.1 1.25 1.4 a over voltage protection control voltage clamp 16.8 20.5 vdc remote on/off please see the remote on/off control section (pg 5) negative logic dc-dc on (short) -0.7 1.2 vdc dc-dc off (open) 3 15 vdc positive logic dc-dc on (open) 3 15 vdc dc-dc off (short) -0.7 1.2 vdc start up time test at nominal vin and constant resistive load power up 30 ms remote on/off 30 ms isolation isolation voltage (input-output) 2250 vdc isolation resistance 10 m ? isolation capacitance 1000 pf environmental operating ambient temperature -40 85 o c storage temperature -55 125 o c temperature coefficient -0.02 +0.02 % / o c mtbf please see the mtbf and reliability section (pg 14) 2,200,000 hours mechanical see figure 1 weight 10.5 grams dimensions 1.10 x 0.94 x 0.335 inches
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 3 of 15 figure 1: mechanical dimensions pin connection pin JF24S15-1000 1 + input 2 - input 3 on/off 4 +vout 5 trim 6 -vout 0.94(23.88) 0.94(23.88) max 0.50(12.7) 0.50(12.7) smd type dip type 0.02(0.5) max 0.4(10.16) 0.80(20.32) section b-b b-b max 0.02(0.5) 0.09(2.3) min stand-off height compliance 0.30(7.62) 0.07(1.78) max 0.07(1.78) (0.6) 0.80(20.32) section a-a 0.03 (0.75) a a 0.4(10.16) 0.30(7.62) 0.05(1.3)typ notes: 1. all dimensions in inches (mm) 2. tolerance: x.xx0.02 (x.x0.5) x.xxx0.010 (x.xx0.25) 3. pin pitch tolerance: 0.014 (0.35) external output trimming 6 5 4 trim up trim down rt1 or rt2 output can be externally trimmed by using the method shown below. product standard table option suffix negative remote on/off with dip r negative remote on/off with smt sr positive remote on/off with dip blank positive remote on/off with smt s dip type without on/off pin d smt type without on/off pin sd dip type without on/off & trim pin g smt type without on/off & trim pin sg dip type without trim pin f smt type without trim pin sf table 1 table 2 figure 2 dip type smt type
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 4 of 15 short circuit protection continuous, hiccup and auto-recovery mode. during short circuit, converter still shut down. the average current during th is condition will be very low and the device can be safety in this condition. design considerations: output over current protection when excessive output currents occur in the system, circuit protection is required on all power supplies. normally, overload current is maintained at approxi mately 110~140% of rated cu rrent for the jf series. hiccup-mode is a method of operation in a power suppl y whose purpose is to prot ect the power supply from being damaged during an over-current fa ult condition. it also enables the power supply to restart when the fault is removed. there are other ways of protecting the power supply when it is over-loaded, such as the maximum current limiting or current foldback methods. one of the problems resulting from over current is that excessive heat may be generated in power devices; especially mosfet and schottky diodes and the temperature of those devices may exceed their specified limits. a protection mechanism has to be used to pr event those power devices from being damaged. the operation of hiccup is as follows. when the current sense circuit sees an over-cu rrent event, the controller shuts off the power supply for a given time and then tr ies to start up the power supply again. if the over-load condition has been removed, the power supply will start up and operate normally; othe rwise, the controller will see another over-current event and s hut off the power supply again, repe ating the previous cycle. hiccup operation has none of the drawbacks of the other tw o protection methods, alt hough its circuit is more complicated because it requires a timing circuit. the excess heat due to overload lasts for only a short duration in the hiccup cycle, hence the junction temperat ure of the power devices is much lower. the hiccup operation can be done in various ways. for ex ample, one can start hicc up operation any time an over- current event is detected; or prohib it hiccup during a designate d start-up is usually la rger than during normal operation and it is easier for an over- current event is detected; or prohi bit hiccup during a designated start-up interval (usually a few mill iseconds). the reason for the latter operati on is that during star t-up, the power supply needs to provide extra current to charge up the output capacitor. thus the current demand during start-up is usually larger than during normal operation and it is ea sier for an over-current even t to occur. if the power supply starts to hiccup once there is an over-current, it might never start up successf ully. hiccup mode protection will give the best protection for a power supply against over current situations, si nce it will limit the average current to the load at a low level, so reducing power dissipation and case temperature in the power devices.
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 5 of 15 the figure below details five possible circuits for driving the on/off pin. remote on/off two remote on/off controls are available for the jf series positive logic remote on/off turns the modules on duri ng a logic-high voltage on th e remote on/off pin, and off during logic low. negative logi c remote on/off turns the module off during logic high and on during logic low or when the remote on/off pin is shorted to the -input pin. for negative logic remote on/off c ontrol add the suffix ?r? for dip type and ?sr? for smt type. for the positive logic on/off control there is no suffix for dip type and add the suffix ?s? for smt type. ex: JF24S15-1000s to turn the power module on and off, the user must supply a switch to control th e voltage between the on/off terminal (v on/off ) and the -input. the switch may be an open coll ector or equivalent (s ee figure). a logic low is v on/off = -0.7v to 1.2v. the maximum i on/off during a logic low is 1ma. the switch should maintain a logic-low voltage while sinking 1ma. during logic high, the maximum v on/off generated by the power module is 15v. the maximum allowable leakage current of the switch at v on/off = 15v is 50ua the module has internal capacitance to reduce noise at the on/off pin. add itional capacitance is not generally needed and may degrade the start-up characteristics of the module. on/off control -input remote enable circuit on/off control -input negative logic (permanently enabled) -input positive logic (permanently enabled) on/off control -input open collector enable circuit on/off control on/off control -input negative logic (permanently enabled) 5v ttl/ cmos figure 3
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 6 of 15 external trim adjustment output voltage set point adjustment a llows the user to increase or decrease the output voltage set point of a module. this is accomplished by connecting an external re sistor between the trim pi n and either the +vout or -vout pins. with an external resist or between the trim and +vout pin, th e output voltage set point decreases. with an external resistor between the trim and -vout pin, the output voltag e set point increases. vo + is the desired up output voltage vo - is the desired down output voltage trim vo + r up vo ? r down 1% 15.15v 161.557 k ? 14.85v 818.223 k ? 2% 15.3v 78.223 k ? 14.7v 401.557 k ? 3% 15.45v 50.446 k ? 14.55v 262.668 k ? 4% 15.6v 36.557 k ? 14.4v 193.223 k ? 5% 15.75v 28.223 k ? 14.25v 151.557 k ? 6% 15.9v 22.668 k ? 14.1v 123.779 k ? 7% 16.05v 18.7 k ? 13.95v 103.938 k ? 8% 16.2v 15.723 k ? 13.8v 89.057 k ? 9% 16.35v 13.409 k ? 13.65v 77.483 k ? 10% 16.5v 11.557 k ? 13.5v 68.223 k ? (in ? ) table 3 trim resistor values (in ? ) rt2 rt1 -vout trim +vout +vin -vin figure 4 5110 5 . 12 5 . 2 5 . 2 0 . 1 4 ? ? ? ? = + o up v r 5110 ) ( 0 . 1 ) 5 . 2 ( 4 ? ? ? ? = ? ? o out o down v v v r
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 7 of 15 graph 1: efficiency vs. output current graph 2: efficiency vs. input voltage (io=full load) 60 65 70 75 80 85 90 100 200 300 400 500 600 700 800 900 1000 85 85.5 86 86.5 87 87.5 88 18 20 22 24 26 28 30 32 34 36 graph 3: output current vs. ambient temperature & airflow graph 4: conducted emission of en55022 class b (nominal vin, io = full load) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 -40-20 0 20406080100 graph 5: typical input start-up and ou tput rise characteristic graph 6: typical output ripple and noise (nominal vin, io = full load) frequency (mhz) output current, iout (ma) efficiency (%) input voltage, vin (v) efficiency (%) a mbient temperature, ta (c) output current (a) input voltage output voltage output voltage 36vin 24vin 18vin natural convection 1.0m/s (200lfm) 2.0m/s (400lfm) 3.0m/s (600lfm)
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 8 of 15 graph 7: using on/off voltage start-up and output rise characteristic graph 8: transient response to dynamic load change from 70% to 50% to 75% of full load output current output voltage on/ off voltage output voltage
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 9 of 15 test setup: the JF24S15-1000 specifications are tested with the following configurations: input reflected-ripple curren t measurement test setup peak-to-peak out put ripple & noise measurement setup output voltage and effici ency measurement setup note: all measurements are taken at the module terminals % 100 ? ? ? ? ? ? = iin vin iout vout efficiency figure 5 figure 6 figure 7
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 10 of 15 thermal consideration the power module operates in a variety of thermal environments; however, suffi cient cooling should be provided to help ensure reliable operation of the unit. heat is removed by conduction, convention, and radiation to the surrounding environment. proper cooli ng can be verified by measuring th e point as the figure below. the temperature at this location should not exceed 120c. wh en operating, adequate cooling must be provided to maintain the test point temperature at or below 120c. although the maxi mum point temperature of the power modules is 120c, you can limit this temperature to a lower value for extremely high reliability. emc considerations temperature measure point figure 8 figure 9 figure 10 recommended layout with input to meet conducted emissions en55022 class b needed the following components: c2, c3, c4: 2.2uf/100v mlcc c5, c6: 470pf/3kv mlcc l1: pulse engineering type p0354, 1.17mh l2: inductor 10uh 0.35mm
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 11 of 15 recommended pad layout for dip type recommended pad layout for smt type figure 11 figure 12
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 12 of 15 soldering and reflow considerations: lead free wave solder profile for dip type lead free reflow profile for smt type zone reference parameter rise temp. speed: 3 /sec max. preheat zone preheat temp. 100~130 peak temp: 250~260 actual heating peak time (t1+t2 time): 4~6 sec zone reference parameter rise temp. speed: 1~3 /sec preheat time: 60~90sec preheat zone preheat temp. 155~185 rise temp. speed: 1~3 /sec melting time: 20~40 sec melting temp:220 peak temp: 230~240 actual heating peak time: 10~20 sec cooling rise temp. speed: -1~-5 /sec figure 13 figure 14
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 13 of 15 packaging information: dip type smt type dip type notes: 1. material: ps (thick=1.2mm) notes: 1. 10 sprocket hole pitch cumulative tolerance 0.2 2. camber not to exceed 1mm in 100mm. 3. material: black advantek polystyrene. 4. ao and bo measured on a plane 0.3mm above the bottom of the pocket. 5. ko measured from a plane on the inside bottom of the pocket to the top surface of the carrier tape. 6. pocket position relative to sprocket hole measured as true position of pocket, not pocket hole. figure 15 figure 16
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 14 of 15 safety and installation instruction: isolation consideration the jf series features 2250 volt dc isol ation from input to output. the input to output resistance is greater than 10m ? . nevertheless, if the system using the power module needs to receive safety agency approval, certain rules must be followed in the design of the system usi ng the model. in particular , all of the creepage and clearance requirements of the end-use safety requirem ent must be observed. these documents include ul60950- 1, en60950-1 and csa 22.2-960, although specific applica tions may have other or additional requirements. fusing consideration caution: this power module is not internally fu sed. an input line fuse must always be used. this encapsulated power module can be used in a wide va riety of applications, ranging from simple stand-alone operation to an integrated part of so phisticated power architecture. to maxi mum flexibility, internal fusing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. the safety agencies require a normal-blow fuse with maximum rating of 2a. based on the informa tion provided in this data sheet on inrush energy and maximum dc input current; the same type of fu se with lower rating can be used. refer to the fuse manufacturer?s data for further information. mtbf and reliability the mtbf of the jf series of dc/dc converters has been calculated using bellc ore tr-nwt-000332 case i: 50% stress, operating temperature at 40c (ground fixed and controlled environment). the resulting figure for mtbf is 2.2 10 6 hours.
technical datasheet JF24S15-1000 (888) 597-wall www.wallindustries.com page 15 of 15 ordering information: part number example: jf 24 s 15 ? 1000 s company information: wall industries, inc. has created custom and modified units for over 40 years. our in-house research and development engineers will provide a solution that ex ceeds your performance requirements on-time and on budget. our iso9001-2000 certification is just one example of our commitment to producing a high quality, well documented product for our customers. our past projects demonstrate our commitment to you, our customer. wall industries, inc. has a reputation for working closely with its customers to ensure each solution meets or exceeds form, fit and function requirements. we will continue to provide ongoing support for your project above and beyond the design and production phases. give us a call today to discuss your future projects. contact wall industries for further information: phone: (603)778-2300 toll free: (888)587-9255 fax: (603)778-9797 e-mail: sales@wallindustries.com web: www.wallindustries.com address: 5 watson brook rd. exeter, nh 03833 series designation nominal input voltage single output nominal output voltage maximum output current (ma) option description r negative remote on/off with dip sr negative remote on/off with smt blank positive remote on/off with dip s positive remote on/off with smt d dip type without on/off pin sd smt type without on/off pin f dip type without trim pin sf smt type without trim pin g dip type without on/off & trim pin sg smt type without on/off & trim pin

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