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UCC2837DTR Datasheet(PDF) 7 Page - Texas Instruments |
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UCC2837DTR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 14 page 7 UCC1837 UCC2837 UCC3837 Practical Considerations In order to achieve the expected performance, careful at- tention must be paid to circuit layout. The printed circuit board should be designed using a single point ground, referenced to the return of the output capacitor. All traces carrying high current should be made as short and wide as possible in order to minimize parasitic resistance and inductance effects. To illustrate the importance of these concepts, consider the effects of a 1.5" PCB trace located between the out- put capacitor and the UCC3837 feedback reference. A 0.07" wide trace of 1oz. copper results in an equivalent resistance of 10.4m Ω. At a load current of 3A, 31.2mV is dropped across the trace, contributing almost 1% error to the DC regulation. Likewise, the inductance of the trace is approximately 3.24nH, resulting in a 91mV spike dur- ing the 100ns it takes the load current to slew from 200mA to 3A. The dropout voltage of a linear regulator is often a key design parameter. Calculations of the dropout voltage of a linear regulator based on the UCC3837 Controller should consider all of the following: • Sense resistor drop, including temperature and tolerance effects, • Path resistance drops on both the input and output voltages, • MOSFET resistance as a function of temperature and gate drive, including transient performance, • Ground path drops. APPLICATION INFORMATION 15 16 17 18 19 20 21 0 20406080 AMBIENT TEMPERATURE [°C] 4 5 6 7 8 9 RESISTANCE SHORT CIRCUIT LIMIT Figure 6. Copper resistance and short circuit limit for example resistor. UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 FAX (603) 424-3460 |
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