? all specifications are subject to change without notice. (1/2) 001-01 / 20030729 / e531_ldr655312.fm inductors ldr series ldr655312 type wound type for power circuit smd these products are low height type power inductors optimum to a dc-dc converter for driving an lcd panel. a plane accuracy of a user terminal is increased by separating a winding terminal. in addition, an application of a new-designed thin type drum core sig- nificantly lowers leakage flux so as to satisfy needs for high density mounting. features the first low height realized by using new magnetic material superior in superimposed dc current characteristics with high specific resistance and by adopting a design in which a lead frame is directly bonded. mountable on the back side of the lcd surface because of low height type (1.20mm max.). low leakage flux drum core with original design applied. size equivalent to a half of a conventional core having the same characteristics realized, thus enabling light weight (0.1g max.). automatic inserter usable in taping specifications. all terminals are welded without lead. applications lcd driving circuits (dc-dc converters) such as notebook-sized personal computers, portable terminal equipment, game units specifications recommended soldering conditions reflow soldering product identification (1) series name (2) dimensionsl w t (3) packaging style (4) inductance value (5)variation code packaging style and quantities application examples step-up chopper circuit inverting chopper circuit step-down chopper circuit operating temperature range ?25 to +85c [including self-temperature rise] storage temperature range ?40 to +85c[unit of products] approx. 90s preheating 40s max. approx. 150s 240?c 200?c 160?c 130?c 9s max. 5s max. natural cooling time ( s ) 230?c soldering 655312 6.5 5.3 1.2mm t taping(reel) 2r2 2.2 h 100 10 h w welding packaging style quantity taping 3000 pieces/reel ldr 655312 t- 2r2 w (1) (2) (3) (4) (5) ldr out in ic ic ldr out in ldr out in ic
all specifications are subject to change without notice. (2/2) 001-01 / 20030729 / e531_ldr655312.fm inductors ldr series ldr655312 type wound type for power circuit smd shapes and dimensions/recommended pc board pattern electrical characteristics ? rated current: value obtained when self-temperature has risen to 40 c. test equipment inductance: yhp 4284 ldr meter, or equivalent(test frequency:100khz/20mv) rdc: digital milliohm meter vp-2941a matsushita, or equivalent typical electrical characteristics inductance change vs. dc superposition characteristics inductance ( h) inductance tolerance (%) test frequency l (khz) dc resistance ( ? )20% rated current (a) ? max. part no. 2.2 20 100 0.125 1.2 ldr655312t-2r2w 3.3 20 100 0.155 0.96 ldr655312t-3r3w 4.7 20 100 0.206 0.9 ldr655312t-4r7w 6.8 20 100 0.24 0.8 ldr655312t-6r8w 10 20 100 0.37 0.7 ldr655312t-100w 15 20 100 0.46 0.6 ldr655312t-150w 22 20 100 0.668 0.5 LDR655312T-220W 33 20 100 1.1 0.42 ldr655312t-330w 47 20 100 1.38 0.34 ldr655312t-470w 6.5max. start mark marking ( inductance code ) 1.2max. 5.3 0.1 weight: 0.1g typ. dimensions in mm rising of welded terminal in pack portion 0.08min. 22 welding part #1 #2 #1 #2 n1 connection #1 #2 6 4 2.3 1 1 dimensions in mm connection pad terminal reinforcement pad 47 h 33 h 22 h 15 h 10 h 6.8 h 4.7 h 3.3 h 2.2 h 1 0.01 0.03 0.1 0.1 0.3 1 3 10 3 10 30 100 inductance ( h ) dc current ( a )
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