PM-CSXX CURRENT SENSE TRANSFORMERS Designed for Switch Mode Power Supply Applications * Tapped and Untapped Versions RoHS * * Frequency Range from 10KHz to 200KHz * Fully Encapsulated Construction * 2500Vrms Minimum Isolation Voltage * Primary Lead Included ELECTRICAL SPECIFICATIONS AT 25OC - OPERATING TEMPERATURE RANGE -40OC TO +80OC CONTROL VALUES REFERENCE VALUES CALC. VALUES PART NUMBER DCR TURNS INDUCTANCE L RS IPK RT KV DROOP S NS + 1% (mH Min.) (Ohms Max.) (Amps) (Ohms) (Volt/Amp) (%) FLUX FACTOR KB LOSS FACTOR KL PM-CS01 PM-CS02 PM-CS03 PM-CS04 50 100 200 300 5.0 20.0 80.0 180.0 0.70 1.40 4.50 11.00 35 50 50 75 15 50 200 300 0.30 0.50 1.00 1.00 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 A A A A PM-CS05 PM-CS06 PM-CS07 PM-CS08 50ct 100ct 200ct 300ct 5.0 20.0 80.0 180.0 0.50 1.00 2.00 3.00 35 50 50 75 15 50 200 300 0.30 0.50 1.00 1.00 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 SCHEMATIC REFER TO CALCULATION EXAMPLE FOR PM-CSXX 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 105O C 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 PHYSICAL Dimensions in inches (mm) SCHEMATIC "A" WHITE DOT DENOTES PIN #1 1 1 3 1 TURN PRIMARY 2 4 3 P M PM-CSXX YYWW 2 4 5 5 .900 (22.86) MAX. .700 (17.78) MAX. UNUSED PINS MAY BE OMITTED SCHEMATIC "B" .700 (17.78) MAX. WHITE DOT DENOTES PIN #1 1 3 1 TURN PRIMARY 2 4 5 .150 (3.81) MIN. PINS 3 - 5 .032 ∅ (0.8) PINS 1 & 2 .052 ∅ (1.3) 2 5 .700 (17.78) TYP. Specifications subject to change without notice. .250 (6.35) TYP. .250 (6.35) TYP. 20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: (949) 452-0511 • FAX: (949) 452-0512 • http://www.premiermag.com 1 PM-CSXX CURRENT SENSE TRANSFORMERS RoHS * High Current _ Primary Rated for 35 Amps RMS * Frequency Range from 50KHz to 500KHz * Designed for automatic pick and place * Maximum height = 10mm ELECTRICAL SPECIFICATIONS AT 25OC - OPERATING TEMPERATURE RANGE -40OC TO +130OC TURNS NS + 1% PART NUMBER PM-CS21 PM-CS22 PM-CS23 PM-CS24 PM-CS25 PM-CS26 1 1 1 1 1 1 SEC INDUCTANCE (mH Min.) : 30 : 50 : 70 : 100 : 200 : 300 SEC DCR (Ohms Max.) 0.50 1.40 2.70 5.60 22.0 50.0 0.34 0.57 0.80 1.50 5.00 12.0 SCHEMATIC HIPOT (Vrms) 35 35 35 35 35 35 500 500 500 500 500 500 MECHANICAL 11 PHYSICAL Dimensions in inches (mm) 2 1 TURN PRIMARY PRI CURRENT (Amps) SECONDARY 12 10 9 8 7 6 4 P PM-CSXX M YYWW RECOMMEND LAYOUT .14 (3.5) .100 (2.54) .050 (1.27) PIN#1 I.D. WHITE DOT 1 6 10 .090 (2.30) 2 3 4 5 9.65 (.38) MAX 5 1 .27 (7.0) .028 (0.70) .27 (7.0) .100 (2.54) 12.9 (.508) .61 (15.50) 12.9 (.508) 19.5 (4.95) MAX Specifications subject to change without notice. 20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: (949) 452-0511 • FAX: (949) 452-0512 • http://www.premiermag.com 2 PM-CSXX CURRENT SENSE TRANSFORMERS RoHS 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 (K F) 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 (K L) 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_out S = (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. 20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: (949) 452-0511 • FAX: (949) 452-0512 • http://www.premiermag.com 3