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LT3022IDHC-TRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LT3022IDHC-TRPBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LT3022 0 3022f applicaTions inForMaTion Table1shows1%resistordividervaluesforsomecommon output voltages with a resistor divider current equaling or about 1mA. Table 1 VOUT (V) R1 (Ω) R2 (Ω) 0.9 200 698 1.0 187 750 1.2 200 1000 1.5 200 1300 1.8 187 1500 2.5 187 2150 3.3 200 3090 Output Capacitance and Transient Response The LT3022’s design is stable with a wide range of output capacitors,butisoptimizedforlowESRceramiccapacitors. The output capacitor’s ESR affects stability, most notably with small value capacitors. Use a minimum output ca- pacitor of 10µF with an ESR of less than 0.1Ω to prevent oscillations. The LT3022 is a low voltage device and output loadtransientresponseisafunctionofoutputcapacitance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for large load current changes. Ceramic capacitors require extra consideration. Manufac- turersmakeceramiccapacitorswithavarietyofdielectrics; each with a different behavior across temperature and applied voltage. The most common dielectrics are Z5U, Y5V, X5R and X7R. Z5U and Y5V dielectrics provide high C-V products in a small package at low cost, but exhibit strong voltage and temperature coefficients. X5R and X7R dielectrics yield highly stable characteristics and are moresuitableforuseastheoutputcapacitoratfractionally increasedcost.X5RandX7Rdielectricsbothexhibitexcel- lent voltage coefficient characteristics. X7R works over a larger temperature range and exhibits better temperature stability whereas X5R is less expensive and is available in higher values. Figures 2 and 3 show voltage coefficient and temperature coefficient comparisons between Y5V and X5R material. DC BIAS VOLTAGE (V) 3022 F02 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 TEMPERATURE (°C) –50 40 20 0 –20 –40 –60 –80 –100 25 75 3022 F03 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10µF Figure 3. Ceramic Capacitor Temperature Characteristics Figure 2. Ceramic Capacitor DC Bias Characteristics 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. The resulting voltages produced can cause appreciable amountsofnoise.AceramiccapacitorproducedFigure 4’s trace in response to light tapping from a pencil. Similar vibration induced behavior can masquerade as increased output voltage noise. |
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