P Premier M Magnetics Inc. PM-CIXX CURRENT SENSE INDUCTORS "INNOVATORS IN MAGNETICS TECHNOLOGY" ! Designed for Switch Mode Power Supply Applications " Tapped and Untapped Versions # Frequency Range from 10KHz to 200KHz $ 2500Vrms Minimum Isolation Voltage % Fully Encapsulated Construction & Center Hole for Primary Lead ELECTRICAL SPECIFICATIONS AT 25OC - OPERATING TEMPERATURE RANGE -40OC TO +80OC CONTROL VALUES REFERENCE VALUES CALC. VALUES INDUCTANCE DCR RT KV LS RS DROOP IPK (mH Min.) (Ohms Max.) (Amps) (Ohms) (Volt/Amp) (%) PART NUMBER TURNS NS + 1% PM-CI01 PM-CI02 PM-CI03 PM-CI04 50 100 200 300 5.0 20.0 80.0 180.0 0.70 1.40 4.50 9.00 35 50 50 75 15 50 200 300 0.30 0.50 1.00 1.00 PM-CI05 PM-CI06 PM-CI07 PM-CI08 50ct 100ct 200ct 300ct 5.0 20.0 80.0 180.0 0.70 1.40 4.50 9.00 35 50 50 75 15 50 200 300 0.30 0.50 1.00 1.00 LOSS FACTOR KL FLUX FACTOR KB SCHEMATIC 2.4 2.0 2.0 1.4 273.97x10 68.49x103 17.12x103 7.61x103 3 -9 3.31x10 3.33x10-9 3.35x10-9 3.37x10-9 A A A A 2.4 2.0 2.0 1.4 273.97x103 68.49x103 17.12x103 7.61x103 3.31x10-9 3.33x10-9 3.35x10-9 3.37x10-9 B B B B REFER TO CALCULATION EXAMPLE FOR PM-CIXX SERIES ON PAGE 2 OF THIS DATA SHEET. 1) REFERENCE VALUES ARE FOR UNIPOLAR OPERATION @ 50KHz, 40% DUTY CYCLE (Dmax = .40). 2) THE MAXIMUM USABLE PEAK SENSE CURRENT (Ipk) IS DEPENDENT ON CORE SATURATION FACTORS AND SHOULD BE EVALUATED FOR THE ACTUAL OPERATING CONDITIONS. SEE APPLICATION DATA AND EXAMPLE ON PAGE 51. 3) THE MAXIMUM RECOMMENDED OPERATING FLUX DENSITY (BOP) @ AN OPERATING TEMPERATURE OF 105OC IS 2000 GAUSS. 4) THE TERM. RESISTOR (Rt) CAN BE VARIED TO ADJUST THE OPERATING FLUX DENSITY (BOP), DROOP, AND SCALE FACTOR (KV). 5) THE SCALE FACTOR (KV) IS PROPORTIONAL TO THE TERMINATING RESISTOR (RT) AND IS EQUAL TO 1VOLT/AMP WHEN RT = NS 6) SECONDARY INDUCTANCE IS MEASURED AT 20KHz, 1.0VRMS. MECHANICAL SCHEMATIC SCHEMATIC "A" PHYSICAL Dimensions in inches (mm) .410 (10.4) MAX 1 .180 DIA. (4.57) MIN .35 (8.8) .838 (21.3) MAX 3 1 2 SCHEMATIC "B" 1 2 3 ∅ .040 (1.02) LEAD 2 PRESENT ON CENTER TAPPED VERSION ONLY ARROW INDICATES CURRENT FLOW PIN#1 IN PHASE P PM-CIXX M YYWW .500 (12.70) .030 (.762) .250 (6.35) 3 .19 (4.8) 3 Specifications subject to change without notice. pmci 4/97 20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: (949) 452-0511 • FAX: (949) 452-0512 • http://www.premiermag.com 1 P Premier M Magnetics Inc. PM-CIXX CURRENT SENSE INDUCTORS "INNOVATORS IN MAGNETICS TECHNOLOGY" APPLICATION EXAMPLE APPLICATION EXAMPLE GIVEN: Part# = PM-CI02 Peak Current (IPK) = 30.0 Amps Terminating Resistor (RT) = 100 Ohms Operating Frequency (f) = 100KHz Duty Cycle (Dmax) = .40 (40% on time) CALCULATE THE SCALE FACTOR From the Table the Secondary Turns are: NS = 100 THEN: KV = RT / NS = 100 / 100 = 1 volt/amp CALCULATE OPERATING FLUX DENSISTY From the Table the FLUX FACTOR is: KB = 68.49 x 103 ESTIMATE ERROR DUE TO LOSSES From the Table the Secondary DCR is: RS = 1.40 Ohms Maximum Flux Utilization Constant (KF) is: 1.0 For Unipolar Operation 2.0 For Bipolar Operation From the Table the approximate Loss Factor is: KL = 3.33 x 10-9 THEN: BOP = KB x IPK x RT x (Dmax / KF x f) Note: The loss factor (KL) is valid approximation from10KHz to 200KHz = 68.49x103 x 30 x 100 x (.4 / 1 x 100x103) Secondary Copper Losses are: P_lossS = (IPK / NS )2 x RS = 822 gauss (OK less than 2000 gauss) = (30/100)2 x 1.40 CALCULATE PULSE DROOP = 0.126 Watt From the Table the Secondary Inductance is: LS = 20mHy Minimum Core losses are: P_lossC = KL2 x f1.621 x BOP2.569 Note: The actual droop is dependent on the actual LS in the circuits enviorment. = (3.33x10-9)2 x (100x103)1.621 x 8222.569 = 0.0435 Watt Droop Exponent (D) = RT x Dmax / (LS x f) Output Power is: = 100 x .4 / (20x10-3 x 100x103) P_outS = (IPK / NS )2 x RT = 0.020 = (30/100)2 x 100 THEN: %_Droop = (1-e-D) x 100 = 1.98 % OK less than 10% (Depending on the application Droop to 20% may be acceptable) = 9.00 Watt THEN: %_Error = [(P_lossS + P_lossC ) / P_out] x 100 = [(.126 + .0435) / 9] x 100 = 1.88 % Specifications subject to change without notice. pmci 4/97 20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: (949) 452-0511 • FAX: (949) 452-0512 • http://www.premiermag.com 2