PM-CI01

P Premier M Magnetics Inc. "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 PART NUMBER PM-CI01 PM-CI02 PM-CI03 PM-CI04 PM-CI05 PM-CI06 PM-CI07 PM-CI08 TURNS NS + 1% PM-CIXX CURRENT SENSE INDUCTORS REFERENCE VALUES CALC. VALUES FLUX FACTOR KB LOSS FACTOR KL 3 INDUCTANCE DCR RT KV LS RS DROOP IPK (mH Min.) (Ohms Max.) (Amps) (Ohms) (Volt/Amp) (%) SCHEMATIC 50 100 200 300 50ct 100ct 200ct 300ct 5.0 20.0 80.0 180.0 5.0 20.0 80.0 180.0 0.70 1.40 4.50 9.00 0.70 1.40 4.50 9.00 35 50 50 75 35 50 50 75 15 50 200 300 15 50 200 300 0.30 0.50 1.00 1.00 0.30 0.50 1.00 1.00 2.4 2.0 2.0 1.4 2.4 2.0 2.0 1.4 273.97x10 68.49x103 17.12x103 7.61x103 3.31x10 3.33x10-9 3.35x10-9 3.37x10-9 -9 A A A A B B B B 273.97x103 68.49x103 17.12x103 7.61x103 3.31x10-9 3.33x10-9 3.35x10-9 3.37x10-9 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. SCHEMATIC SCHEMATIC "A" MECHANICAL PHYSICAL Dimensions in inches (mm) .410 (10.4) MAX .35 (8.8) .838 (21.3) MAX .180 DIA. (4.57) MIN 1 3 SCHEMATIC "B" 1 P PM-CIXX M YYWW 2 3 ∅ .030 (.762) 3 ARROW INDICATES CURRENT FLOW PIN#1 IN PHASE 1 2 3 Specifications subject to change without notice. .040 (1.02) LEAD 2 PRESENT ON CENTER TAPPED VERSION ONLY .500 (12.70) .250 (6.35) .19 (4.8) 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. "INNOVATORS IN MAGNETICS TECHNOLOGY" PM-CIXX CURRENT SENSE INDUCTORS CALCULATE THE SCALE FACTOR From the Table the Secondary Turns are: NS = 100 THEN: KV = RT / NS = 100 / 100 = 1 volt/amp 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 OPERATING FLUX DENSISTY From the Table the FLUX FACTOR is: KB = 68.49 x 103 Flux Utilization Constant (KF) is: 1.0 For Unipolar Operation 2.0 For Bipolar Operation THEN: BOP = KB x IPK x RT x (Dmax / KF x f) = 68.49x103 x 30 x 100 x (.4 / 1 x 100x103) = 822 gauss (OK less than 2000 gauss) ESTIMATE ERROR DUE TO LOSSES From the Table the Secondary DCR is: RS = 1.40 Ohms Maximum From the Table the approximate Loss Factor is: KL = 3.33 x 10-9 Note: The loss factor (KL) is valid approximation from10KHz to 200KHz Secondary Copper Losses are: P_lossS = (IPK / NS )2 x RS = (30/100)2 x 1.40 CALCULATE PULSE DROOP From the Table the Secondary Inductance is: LS = 20mHy Minimum Note: The actual droop is dependent on the actual LS in the circuits enviorment. Droop Exponent (D) = RT x Dmax / (LS x f) = 0.126 Watt Core losses are: P_lossC = KL2 x f1.621 x BOP2.569 = (3.33x10-9)2 x (100x103)1.621 x 8222.569 = 0.0435 Watt Output Power is: = 100 x .4 / (20x10-3 x 100x103) P_outS = 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) Specifications subject to change without notice. = (IPK / NS )2 x RT = 9.00 Watt THEN: %_Error = [(P_lossS + P_lossC ) / P_out] x 100 = [(.126 + .0435) / 9] x 100 = 1.88 % pmci 4/97 20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: (949) 452-0511 • FAX: (949) 452-0512 • http://www.premiermag.com 2