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UC382TDKTTT-3G3 数据表(PDF) 5 Page - Texas Instruments |
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UC382TDKTTT-3G3 数据表(HTML) 5 Page - Texas Instruments |
5 / 19 page UC2821, UC2822, UC2823, UC282ADJ, UC3821, UC3822, UC3823, UC382ADJ FAST LDO LINEAR REGULATOR SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 pin descriptions (continued) Figure 1 DROPOUT VOLTAGE (VB − VOUT) vs LOAD CURRENT 3 IL− Load Current − A 2 1 0 1.7 1.8 1.9 1.6 TJ = 275C Figure 2 DROPOUT VOLTAGE (VIN − VOUT) vs LOAD CURRENT 3 A 2 A 1 A 100 mA 100 200 300 400 IL - Load Current - A TJ = 275C APPLICATION INFORMATION The UC382 is easy to use. The adjustable version requires two 0.1% resistors to set the output voltage. The fixed versions of the UC382 require no external resistors. All versions of the UC382 require decoupling capacitors on the input and output. In a typical application, VB and VIN are driven from switching power supplies which may have large filter capacitors at their outputs. If the UC382 is further than 12 inches from the power supply, it is recommended to add local decoupling as close as possible to the linear regulator. Decouple the output of the UC382 with at least 100 µF of high-quality tantalum or Sanyo OSCON capacitors close to the VOUT pin for maximum stability. Many applications involving Ultra-Fast GTL or BTL applications require additional capacitance close to the load. The exact amount will vary according to speed and magnitude of the load transients and the tolerance allowed for transients on VOUT. When specifying the decoupling capacitors, the series resistance of the capacitor bank is an important factor in its ability to filter load transients. The UC382 allows for Kelvin sensing the voltage at the load. This improves regulation performance and eliminates the voltage drops due to wire-trace resistance. This voltage drop must be added to the headroom (VIN to VOUT and VB to VOUT). The dropout of 450 mV is measured at the pins and does not include additional drops due to trace resistance. The minimum load current is 10 mA. Two or more UC382’s may be used in parallel. While stable, this arrangement does degrade the transient response. |
类似零件编号 - UC382TDKTTT-3G3 |
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类似说明 - UC382TDKTTT-3G3 |
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