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KS8993M Datasheet(PDF) 84 Page - Micrel Semiconductor |
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KS8993M Datasheet(HTML) 84 Page - Micrel Semiconductor |
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84 / 85 page 
Micrel, Inc. KS8993M/ML/MI April 2005 84 M9999-041205 Selection of Isolation Transformers A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode choke is recommended for exceeding FCC requirements. The following table gives recommended transformer characteristics. Parameter Value Test Condition Turns ratio 1 CT : 1 CT Open-circuit inductance (min.) 350 µH 100mV, 100kHz, 8mA Leakage inductance (max.) 0.4 µH 1MHz (min.) Inter-winding capacitance (max.) 12pF D.C. resistance (max.) 0.9 Ω Insertion loss (max.) 1.0dB 0MHz – 65MHz HIPOT (min.) 1500Vrms Table 27. Transformer Selection Criteria Magnetic Manufacturer Part Number Auto MDI-X Number of Port Bel Fuse S558-5999-U7 Yes 1 Bel Fuse SI-46001 Yes 1 Bel Fuse SI-50170 Yes 1 Delta LF8505 Yes 1 LanKom LF-H41S Yes 1 Pulse H1102 Yes 1 Pulse (low cost) H1260 Yes 1 Transpower HB726 Yes 1 YCL LF-H41S Yes 1 Table 28. Qualified Single Port Magnetics Selection of Reference Crystal Chacteristics Value Units Frequency 25.00000 MHz Frequency tolerance (max) ±50 ppm Load capacitance (max) 20 pF Series resistance 25 Ω Table 29. Typical Reference Crystal Characteristics |
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