140w smt planar transformer and inductor for use with linear technology?s lt1725 ? mechanicals schematics new! p569.b (12/02) pa0423 pa0465/PA0480 weight ..................11.0 grams ..................11.0 grams tape & reel ...............180/reel.......................250/reel tray .............................40/tray.........................90/tray dimensions: inches mm unless otherwise specified, all tolerances are .010 0,25 planar transformer ? pa0423 power rating: 140w (48v to 12v/11.7a) height: 8.4mm max footprint: 23.4mm x 20.1mm max planar inductor ? pa0465 and PA0480 energy storage: up to 340j (4.2h/12.8a) height: 7.4mm max footprint: 23.4mm x 20.1mm max inductance turns ratio dcr (m ? max) inductance saturation current 4 heating part @irated (7-11) irated 3 (main winding main winding aux. winding @ 0 a dc (a) current 5 number (h 12%) (a dc ) to aux.) (7-11) (1-6) (h 12%) @ 25c @ 100c (a) pa0465 4.2 12.8 4:5 2.8 460 4.4 16 15 37 PA0480 5.8 8.5 4:5 2.8 460 6.2 11 10 37 electrical specifications @ 25c ? operating temperature - 40c to 125c part power turns ratio primary primary leakage dcr number rating 2 (pri:sec:aux) secondary inductance inductance primary primary aux. secondary isolation (h min) (h max) (m ? max) (m ? max) (m ? max) pa0423 140 w (12v/11.7a) 8:4:4 1500 vdc basic 140 0.1 55 500 7.0 electrical specifications @ 25c ? operating temperature - 40c to 125c us 619 674 8100 ? ? uk 44 1483 401 700 ? ? france 33 3 84 35 04 04 ? ? singapore 65 6287 8998 ? ? taiwan 886 2 2698 0228 ? ? hong kong 852 2788 6588 ? ? http://www.pulseeng.com pa0423 pa0465/PA0480
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100w smt planar transformer and inductor for use with linear technology?s lt1725 ? p569.b (12/02) for more information : performance warranty of products offered on this data sheet is limited to the parameters specified. data is subject to change w ithout notice. other brand and product names mentioned herein may be trademarks or registered trademarks of their respective owners. printed on recycled paper. ?2002, pulse engineering, inc. 1. the pa0423 transformer and pa0465/pa04680 inductor were designed for use with linear technology's lt1725 ? and ltc1693 ? ic's and form the foundation of a low cost, discrete component alternative to telecom power modules. the pa0423 transformer and pa0465/pa04680 inductor were designed for (but not limited to) the following applications: topology: single switch forward frequency: 230khz pri./sec. isolation: basic insulation (1500vdc) input voltage: 36-75v telecom input output voltage: 12v / 11.7a output for pa0423: basic insulated planar transformer: 2. to determine if the transformer is suitable for your application, it is necessary to ensure that the temperature rise of the compo- nent (ambieint plus temp. rise) does not exceed its operating temperature. to determine the temperature rise of the compo- nent it is necessary to calculate the total power losses (core and copper) in the application. total copper losses (pcu total(w)): pcu total(w) = sum of the losses in each winding the losses in each winding can be calculated by: pcu(w) = .001* dcr(m ? ) * (irms 2 ) core losses (pcore(w)) to calculate core loss, use the following formula: coreloss (w) = 1.92 * 10 -13 ( ? b) 2.5 * (freq khz) 1.8 where: ? b = 22653.1 * vin min * dutycycle max / freq khz total losses: p total = pcu total + coreloss temperature rise: the approximate temperature rise can be found by looking up the calculated total losses in the temperature rise vs. power dissipation curve. for p0465 and p0480: planar inductor 3. the rated current as listed is either 85% of the saturation cur- rent or the heating current depending on which value is lower. 4. the saturation current is the current which causes the induc- tance to drop by 15% at the stated ambient temperatures (25c, 100c). this current is determined by placing the com- ponent in the specified ambient environment and applying a short duration pulse current (to eliminate self-heating effects) to the component. 5. the heating current is the dc current which causes the temper- ature of the part to increase by approximately 45c. this cur- rent is determined by mounting the component on a pcb with a .25" wide, 2oz. equivalent copper traces, and applying the cur- rent to the device for 30 minutes with no force air cooling. 6. in high volt*time applications additional heating in the compo- nent can occur due to core losses in the inductor which may neccessitate derating the current in order to limit the tempera- ture rise of the component. in order to determine the approxi- mate total losses (or temperature rise) for a given application both copper an core losses should be taken into account total copper losses (pcu_total(w)): pcu(w)= .001* dcr(m ? ) * (irms 2 ) where: irms = (idc 2 + ( ? 1/2) 2 ) .5 ? 1 = ripple current through inductor core losses (pcore(w)): use the inductor voltage versus coreloss table to determine the approximate core losses total losses: p total = pcu total + coreloss temperature rise: the approximate temperature rise can be found by looking up the calculated total losses in the temperature rise vs. power dissipation curve. 7. lt1725 ? and ltc1693 ? are registered trademarks of linear technology corporation. notes from tables united states (worldwide) 12220 world trade drive san diego, ca 92128 u.s.a. http://www.pulseeng.com tel: 858 674 8100 fax: 858 674 8262 united kingdom (northern europe) 1 & 2 huxley road the surrey research park guildford, surrey gu2 5re united kingdom tel: 44 1483 401700 fax: 44 1483 401701 france (southern europe) zone industrielle f-39270 orgelet france tel: 33 3 84 35 04 04 fax: 33 3 84 25 46 41 taiwan, r.o.c. (northern asia) 3f-4, no. 81, sec. 1 hsintai wu road hsi-chih, taipei hsien taiwan, r.o.c. tel: 886 2 2698 0228 fax: 886 2 2698 0948 singapore (southern asia) 150 kampong ampat #07-01/02 ka centre singapore 368324 tel: 65 6287 8998 fax: 65 6280 0080 hong kong (china/hong kong) 19/f, china united plaza 1008 tai nan west street cheung sha wan, kowloon hong kong, china tel: 852 2788 6588 fax: 852 2776 1055 distributor
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