MODEL LPT-4545 Surface Mount, Toroidal Inductors FEATURES VIiSHAY * Toroidal design for minimal EMI radiation in DC to DC converter applications * Designed to support the growing need for efficient DC to DC converters in battery operated equipment * Two separate windings provide versatility by ability to connect windings in series or parallel * Supplied on tape and reel and is designed to be pick and place compatible * Custom versions available. Contact the factory with your specifications. STANDARD ELECTRICAL SPECIFICATIONS PARALLEL CONNECTED SERIES CONNECTED IND. RATED DCR IND. RATED DCR (uh) CURRENT MAX. ql) CURRENT MAX. ENERGY* MODEL 115% (A) (Ohms} + 15% (A) (Ohms) (ui) LPT-4545-100LA 10 4.000 030 40 2,000 120 55 LPT-4545-150LA 15 3,000 045 60 1.500 180 45 LPT-4545-200LA 20 2.100 050 80 1,050 215 45 LPT-4545-330LA 33 1.650 075 432 830 300 45 LPT-4545-500LA 50 1.350 105 200 675 420 45 LPT-4545-101LA 100 950 475 400 475 700 45 LPT-4545-151LA 150 720 330 ~ 600 360 1.32 45 LPT-4545-251LA 250 600 600 ~~ 4000 300 2.40 45 LPT-4545-301LA 300 550 600 1200 275 2.30 45 * Based on 1/2LI* where | is the current that reduces the inductance by 30% to 35%. DIMENSIONAL CONFIGURATIONS [Numbers in brackets indicate millimeters} LU -020 (.508) Minimum Clearance for Cleaning .250 [6.350] Max. i SCHEMATICS - CONNECTION DIAGRAMS INDUCTANCE vs DC BIAS CURRENT Transformer Parallel Series _ oe 54. 1 wr4 1 o | . 0 4 tod, ot > es ]{c ak ; 5 ; I 26 ? zo or _ 1h - 03 PART MARKING -- Dale ~- Mode! number - Pin #1 identification PERCENT OF INITIAL INDUCTANCE TYPICAL 100 90% B0%. 7 70% 4 60%. Oe, 25% 50%. T T t 75% PERCENT OF RATED CURRENT 100. 274 DALE ELECTRONICS, INC., E. Hwy 50, P.O. Box 180, Yankton, SD 57078-0180 * Phone (605) 665-9301 * Fax 605-665-1627 MODEL LPT-4545 SURFACE MOUNT SOLDERING Solder methods for surface mount are IR, vapor phase and solder wave. IR is the most used at this time and discussion between users and vendors has resulted in recommendations for solder. A Recommended Temperature Profile for the IR reflow process is included which reflects the typical current usage. Preheat: Incorporates a 2 1/2'C rise per second maximum. Zone 1: 1C to 2C rise per second. Zone 2: Stabilize, to allow more uniform heat distribution. Zone 3: Solder liquidus interval 45 seconds preferred, 60 seconds maximum. Helps to prevent lead (Pb) crystallization. Cool Down: 2C to 4'C drop per second forced room air temperature cooling. As a general rule for all methods of soldering: 1. Preheat the components and the board to within 100C of the soldering temperature for a minimum of 60 seconds. This ramping should not exceed 1 1/2 C to 2 1/2:C per second. 2. (a) Reflow soldering temperature should not exceed + 230C with a maximum time of 20 seconds. (b) Wave soldering temperature should not exceed + 240C with a maximum time of 5 seconds. (c) Vapor phase reflow soldering should not exceed + 220 C with a maximum time of 40 seconds. 3. In all cases, gradual cooling to room temperature is recommended. When profiling IR ovens, profile each board style with thermocouples embedded under components on the board. Expect the edges of the board to get 20 C to 30 C hotter than the board center. Ultrasonic cleaning should be done with power regulated equipment. Older 25 kHz, unregulated equipment can damage joints and components. TEMPERATURE PROFILE " ~< 5 Second Peak TEMPERATURE DEG. CENTIGRADE a o Preheat GQ 30 60 30 120 150 180 2 TIME (SECONDS) Cool Down 0 240 270 RECOMMENDED LAYOUT PATTERN (Top View) [Numbers in brackets indicate millimeters] \< -492 [12.497] | F -348 [8.839] es | eR pe J ed , LX . ) A Aw. . ar) v ~~ [4,064] ae -. .492 ae oN * [12.497] HOW TO ORDER LPT 4545 SIZE INDUCTANCE VALUE 100 +15% A INDUCTANCE CORE/ TOLERANCE HEIGHT PACKAGING [Numbers in brackets Indicate millimeters] Pocket Tape Orientation Carrier Tape Width 945 {24.0} e DALE LPT-4545 co OOOOOCOCOOO000 OC Pitch 1630 [16.0] Parts per 13" [330.2] Reel 600 All embossed carrier tape packaging will be in compliance with the latest revision of EIA-481. REELING OIRECTION DALE ELECTRONICS, INC., E. Hwy 50. P O. Box 180, Yankton, SD 57078-0180 * Phone (605) 665-9301 * Fax 605-665-1627 275