B78417A2287A003

SMT current sense transformers EP 7 core Series/Type: B78417A2 Date: September 2019 a~í~=pÜÉÉí ¤ TDK Electronics AG 2019. Reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without TDK Electronics’ prior express consent is prohibited. SMT current sense transformers B78417A2 EP 7 SMT current sensor transformers Construction ■ ■ ■ ■ ■ ■ ■ Ferrite core Primary winding: frame molded in Secondary winding: copper wire Creepage distance Np/(Ns, core): 5 mm Clearance distance Np/Ns (CuL): 3.2 mm Clearance distance Np/core: 3.5 mm Plastic bobbin (UL 94-V0, CTI t 175) Applications ■ ■ ■ ■ Switch-mode power supplies Feedback control Overload sensing Load drop/shut-down detection Features Very low DC resistance Different turns ratios Small SMD package RoHS compatible Qualified to AEC Q-200 Insulation distances in compliance with IEC 60664 (basic insulation, working voltage VRMS = 500 V) ■ UL 1446 Class 155 (F) electrical insulation system ■ ■ ■ ■ ■ ■ Terminals ■ SMD L pins Marking ■ Product brand, middle block of ordering code, date code, pin 1 marker, production place identification mode Delivery mode and packing units ■ Blister tape ■ Packing units: 320 pcs./reel Please read Cautions and warnings and Important notes at the end of this document. 2 09/19 SMT current sense transformers B78417A2 EP 7 SMT current sensor transformers Dimensional drawing Dimensions in mm Application circuit and pinning Please read Cautions and warnings and Important notes at the end of this document. 3 09/19 SMT current sense transformers B78417A2 EP 7 Technical data and measuring conditions All data is specified at +25 °C if not mentioned otherwise. All values without tolerance are typical values. Frequency range 50 ... 500 kHz High voltage test 2400 V AC, 50 Hz, 1 s (winding to winding), type test 60 s Inductance L (5-4) Measured at 20 kHz, 10 mV, +25 °C DC resistance Rmax (1-2) Measured at +25 °C DC resistance Rmax (5-4) Measured at +25 °C Sensed current Iprim, RMS The max. primary current of 20 A causes approx. +40 °C temperature rise Couple capacitance Cp (1-5) Measured at 10 kHz, 1 V, +25 °C Solderability t 99.9 Sn, lead-free. or Sn96.5Ag3.0Cu0.5: +(245 ±5) °C, (3 ±0.3) s Wetting of soldering area t 95% (to IEC 60068-2-58) Resistance to soldering heat In accordance with JEDEC J-STD-020D +245 °C (Tpeak –5 °C for 30 s) Storage conditions (packaged) –20 °C … +40 °C, d 75% RH Operating temperature range –40 °C … +150 °C Pollution degree P2 (to IEC 61558-1, IEC 60664) Insulation thermal class +155 °C (F) (to IEC 60085) Weight Approx. 2.5 g Please read Cautions and warnings and Important notes at the end of this document. 4 09/19 SMT current sense transformers B78417A2 EP 7 V sense max ˜ G max B max = ---------------------------------------n s ˜ A e ˜ f osc With: Maximum magnetic flux density in the ferrite core of the current sense transformer Bmax Vsense,max Maximum output voltage of the measurement signal dmax Maximum duty cycle ns Number of turns of the secondary winding of the current sense transformer Ae Effective magnetic area of the ferrite core fosc Operating frequency of the switching operator IC Typical value for Ae: 10.6 x 10-6 m2 Typical Bmax: 0.2 T V sense max ˜ n s R T = ---------------------------------I prim max With: RT Vsense,max ns Iprim,max Resistance of burden resistor Maximum output voltage of the measurement signal Number of turns on the secondary side of the current sense transformer Maximum primary current (peak current) Characteristics and ordering codes Lmin (5-4) Turns ratio DC resistance Rmax (m:) mH np : ns (1-2) primary (4-5) secondary V 1.7 1 : 50 1.9 2.1 116 4 50 B78417A2285A003 3.0 1 : 70 1.9 2.9 163 4 70 B78417A2286A003 7.0 1 : 100 1.9 5.0 233 4 100 B78417A2185A003 11.0 1 : 125 1.9 5.3 291 4 125 B78417A2287A003 Voltage-time Cp product at ns1) ˜ μs pF Recomm. Ordering code RT : 1) The maximum volt-sec rating limits the peak flux density to 200 mT when used in a unipolar drive application. For bipolar drive applications, a maximum volt-sec of two times is acceptable. Please read Cautions and warnings and Important notes at the end of this document. 5 09/19 SMT current sense transformers B78417A2 EP 7 Taping and packing Blister tape Dimensions in mm Reel Dimensions in mm Please read Cautions and warnings and Important notes at the end of this document. 6 09/19 SMT current sense transformers B78417A2 EP 7 Recommended reflow soldering curve Pb-free solder material (based on JEDEC J-STD 020D) T1 °C T2 °C T3 T4 T1 sec T2 sec T3 sec °C °C 150 200 217 245