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UC3702 датащи(PDF) 4 Page - Texas Instruments |
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UC3702 датащи(HTML) 4 Page - Texas Instruments |
4 / 6 page 4 UC1702 UC2702 UC3702 Although the inductance may not be specified in the re- lay datasheet, it is very repeatable since it is determined by the number of turns and geometry of the relay. The relay’s coil inductance divided by its series resis- tance is the relay coil’s relaxation time constant. It is im- portant that the relaxation time constant be at least an order of magnitude longer than the nominal switching pe- riod of the UC3702 to obtain a constant current through the relay coil. This means that some relays may be ill-suited for use with the UC3702. For example, a common 12V industrial relay has a series resistance of 500 and a coil inductance of 500mH. Its relaxation time constant is 1ms, an order of magnitude less than the period of a 10kHz oscillator. When performing an engineering evaluation of the UC3702 in a system, it is useful to have a current probe. Alternately, a 1 resistor can be placed in series with the relay coil in the prototype and differential voltage probes can be used to observe the coil current. (Do not use a large series resistor, as this will impact observed relax- ation time constant.) Layout Considerations The layout of the printed circuit board and good decoup- ling of the power supplies is critical to proper operation of the UC3702. For best results, high quality 4.7 F tanta- lum capacitors should be placed as close as possible to the VCC and the VBUS pins. In addition to decoupling considerations, the R1 and R2 pins are sensitive to capacitive coupling from any of the driver outputs (OUTA - D) which can slew at speeds of 300V/ s. The external resistors R1 and R2 should be placed as close as possible to their respective pins. Avoid routing the outputs directly past these pins without a low impedance trace (such as GND, VCC, or VBUS) in between to act as a capacitive shield. APPLICATIONS INFORMATION (cont.) Typical Microcontroller Application Driving 12V Industrial Relays UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 • FAX (603) 424-3460 UDG-96010-1 |
Аналогичный номер детали - UC3702 |
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Аналогичное описание - UC3702 |
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