the copyright and authority for the interpretation of the products are reserved by mornsun specifications subject to change without notice. krb_d-3w a/3-2012 page 1 of 2 krb_d-3w series 3w,wide input, non-isolated & regulated single output dc-dc converter rohs product program input output voltage (vdc) current (ma) part number nominal range voltage (vdc) max min efficiency (%, typ) package style krb0712 d - 3 w 7.2 6.4 - 8.4 12 250 25 8 5 dip KRB1205D-3W 12 9-18 5 600 60 86 dip krb2403d - 3w 24 18 - 35 3.3 900 90 77 dip krb2405d-3w 24 18-35 5 600 60 80 dip note: models listed with strike-through text have been officially discontinued. output specifications item test conditions min typ max units output power see below products program 0.3 3 w voltage accuracy from 25% to 100% load 3 load regulation from 10% to 100% load 0.5 0.75 line regulation input voltage from low to high 0.2 0.5 % temperature drift (vout) refer to recommended circuit 0.03 %/ c ripple+noise** 20mhz bandwidth 75 150 mvp-p switching frequency 100% load, nominal input voltage 80 400 khz **test ripple and noise by parallel cable method. see detailed operation instructions at testing of power converter section, application notes. features efficiency to 86% temperature range: -20 c to +71 c ul94-v0 package no external component required no heat sink required industry standard pinout mtbf>1,000,000 hours rohs compliance applications the krb_d-3w series are specially designed for applications where a wide range input voltage power supplies are non-isolated from the input power supply in a distributed power supply system on a circuit board. these products apply to: 1) where the voltage of the input power supply is wide range. 2) where the regulation of the output voltage and the output ripple noise are not demanding. 3) where the regulation of the output voltage and the output ripple noise are not demanding. model selection KRB1205D-3W product series input voltage output voltage package style rated power mornsun science & technology co.,ltd. address: no. 5, kehui st. 1, kehui development center, science ave., guangzhou science city, luogang district, guangzhou,p.r.china. tel: 86-20-38601850 fax:86-20-38601272 http://www.mornsun-power.com note: 1. all specifications measured at t a =25 c, humidity<75%, nominal input voltage and rated output load unless otherwise specified. 2. see below recommended circuits for more details.
the copyright and authority for the interpretation of the products are reserved by mornsun specifications subject to change without notice. krb_d-3w a/3-2012 page 2 of 2 common specifications application note item test conditions min typ. max units storage humidity 95 % storage temperature -55 125 operating temperature power derating (above 55 c) -20 71 lead temperature 1.5mm from case for 10 seconds 300 temp. rise at full load 30 c cooling free air convection case material plastic (ul94v-0) mtbf 25 c(mil-hdbk-217f) 1000 k hours weight 13 g typical charecteristics 0 20 40 60 80 100 120 -20 0 40 71 120 55 o u t p u t p o w e r ( % ) operating temp.() temperature derating graph safe operating graph outline dimensions & footprint details 30.30 [1.193] 2 1 . 5 0 [ 0 . 8 4 6 ] 12.30 [0.484] 1 3 . 6 5 [ 0 . 5 3 7 ] 1 .30 [0.051] 1 2 3 4 mechanical dimensions recommended footprint tube outline dimensions 4 . 1 0 [ 0 . 1 6 1 ] 9 . 0 0 [ 0 . 3 5 4 ] 0.80 [0.031] (front view) footprint details pin function 1 2 3 4 gnd vin +vo nc ncnoconnection : note: unit: mminch tolerances:mminch general tolerances:mminch [] 0.10 [ 0.004 ] 0.25 [ 0.010 pin diameter ] shorttubeinnerpackagingdimensions: l*w*h=255*170*80mm; shorttubeouterpackaging dimensions (withsixinnerpackagingboxes): l*w*h=375*280*270mm; long tubeinnerpackagingdimensions: l*w*h=580*200*100mm; long tubeouterpackagingdimensions(withtwoinnerpackagingboxes) l*w*h=600*215*220mm; long tubeouterpackagingdimensions(with threeinnerpackagingboxes) l*w*h=600*215*325mm. note: unitmm[inch] generaltolerance : 0.50mm[ 0.020inch] l=530mm[20.866 inch]packagingquantity:17pcs l=220mm[8.661inch] pcs packagingquantity:7 notegrid mm 2.54*2.54 . (top view) 20.32 [0.800] 27.50 [1.083] 2 0 . 3 2 [ 0 . 8 0 0 ] 2 7 . 5 0 [ 1 . 0 8 3 ] 5.08 [0.200] 1 2 3 4 recommended circuit all the krb_p series have been tested according to the following recommended testing circuit before leaving factory. (figure 1). vin gnd +vout gnd + dc-dc + load cin cout if you want to further decrease the input/output ripple, you can increase capacitance properly or choose capacitors with low esr. however, the capacitance should not be too high, recommended parameter sees (table 1). external capacitor table(table 1) cin cout normal temp. cout (-20 to +71 c) 100 f 100 f (electrolytic capacitor) 47 f (tantalum capacitor) input current when it is used in unregulated power supply, be sure that the fluctuating range of the power. supply and the rippled voltage do not exceed the module standard. input current of power supply should afford the startup current of this kind of dc/dc module (figure 2) i n p u t c u r r e n t ( a ) input voltage (v) input voltage range ip input polarity protection under normal operating conditions, the output circuit of these products has no protection against positive and negative reverse connection. the simplest method is to connect a diode in series at the input end. no parallel connection or plug and play.
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