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LT1963AES8 数据表(PDF) 17 Page - Linear Dimensions Semiconductor |
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LT1963AES8 数据表(HTML) 17 Page - Linear Dimensions Semiconductor |
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17 / 28 page  LT1963A Series 17 1963afe Y5Vdielectricsaregoodforprovidinghighcapacitancesin asmallpackage,butexhibitstrongvoltageandtemperature coefficients as shown in Figures 10 and 11. When used with a 5V regulator, a 10µF Y5V capacitor can exhibit an effective value as low as 1µF to 2µF over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less expensive and is available in higher values. Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or micro- phone works. For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. “FREE” Resistance with PC Traces The resistance values shown in Table 2 can easily be made using a small section of PC trace in series with the output capacitor. The wide range of non-critical ESR makes it easy to use PC trace. The trace width should be sized to handle the RMS ripple current associated with the load. Theoutputcapacitoronlysourcesorsinkscurrentforafew microsecondsduringfastoutputcurrenttransitions.There is no DC current in the output capacitor. Worst case ripple current will occur if the output load is a high frequency (>100kHz) square wave with a high peak value and fast edges (< 1µs). Measured RMS value for this case is 0.5 times the peak-to-peak current change. Slower edges or lower frequency will significantly reduce the RMS ripple current in the capacitor. Figure 10. Ceramic Capacitor DC Bias Characteristics DC BIAS VOLTAGE (V) 1963A F10 20 0 –20 –40 –60 –80 –100 0 4 8 10 2 6 12 14 X5R Y5V 16 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF Figure 11. Ceramic Capacitor Temperature Characteristics TEMPERATURE (°C) –50 40 20 0 –20 –40 –60 –80 –100 25 75 1963A F11 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF applicaTions inForMaTion Table 2. PC Trace Resistors 10mΩ 20mΩ 30mΩ 0.5oz CU Width Length 0.011" (0.28mm) 0.102" (2.6mm) 0.011" (0.28mm) 0.204" (5.2mm) 0.011" (0.28mm) 0.307" (7.8mm) 1.0oz CU Width Length 0.006" (0.15mm) 0.110" (2.8mm) 0.006" (0.15mm) 0.220" (5.6mm) 0.006" (0.15mm) 0.330" (8.4mm) 2.0oz CU Width Length 0.006" (0.15mm) 0.224" (5.7mm) 0.006" (0.15mm) 0.450" (11.4mm) 0.006" (0.15mm) 0.670" (17mm) |
类似零件编号 - LT1963AES8 |
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类似说明 - LT1963AES8 |
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