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LM3420AM5X-4.2 数据表(PDF) 11 Page - National Semiconductor (TI) |
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LM3420AM5X-4.2 数据表(HTML) 11 Page - National Semiconductor (TI) |
11 / 17 page Compensation (Continued) portant when analyzing closed loop stability. The minimum and maximum room temperature values of this resistor are specified in the Electrical Characteristics section of this data sheet, and a curve showing the temperature coefficient is shown in the curves section. Minimum values of R f result in lower phase margins. Test Circuit The test circuit shown in Figure 2 can be used to measure and verify various LM3420 parameters. Test conditions are set by forcing the appropriate voltage at the V OUT Set test point and selecting the appropriate R L or IOUT as specified in the Electrical Characteristics section. Use a DVM at the “measure” test points to read the data. V REG External Voltage Trim The regulation voltage (V REG) of the LM3420 can be exter- nally trimmed by adding a single resistor from the COMP pin to the +IN pin or from the COMP pin to the GND pin, depend- ing on the desired trim direction. Trim adjustments up to ±10% of V REG can be realized, with only a small increase in the temperature coefficient. (See temperature coefficient curve shown in Figure 3 below.) Formulas for selecting trim resistor values are shown below, based on the percent of increase (%incr) or percent of de- crease (%decr) of the output voltage from the nominal volt- age. For LM3420-4.2 R increase = 22x10 5/%incr R decrease = (53x10 5/%decr) − 75x103 For LM3420-8.2 DS012359-7 FIGURE 2. LM3420 Test Circuit DS012359-8 Normalized Temperature Drift with Output Externally Trimmed DS012359-9 Increasing V REG DS012359-10 Decreasing V REG FIGURE 4. Changing V REG www.national.com 11 |
类似零件编号 - LM3420AM5X-4.2 |
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类似说明 - LM3420AM5X-4.2 |
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