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LT1764A Datasheet(PDF) 9 Page - Linear Technology |
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LT1764A Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LT1965 9 1965f APPLICATIONS INFORMATION capacitor values below appropriate levels. Capacitor DC bias characteristics tend to improve as component case size increases, but expected capacitance at operating voltages should be verified. 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 amounts of noise. A ceramic capacitor produced the trace in Figure 4 in response to light tapping from a pencil. Similar vibration induced behavior can masquerade as increased output voltage noise. Overload Recovery Like many IC power regulators, the LT1965 has safe oper- ating area protection. The safe area protection decreases current limit as input-to-output voltage increases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. The protective design provides some output current at all values of input-to- output voltage up to the device breakdown. When power is first applied, as input voltage rises, the output follows the input, allowing the regulator to start up into very heavy loads. During start-up, as the input voltage is rising, the input-to-output voltage differential is small, allowing the regulator to supply large output currents. With a high input voltage, a problem can occur wherein removal of an output short will not allow the output to recover. Figure 2. Ceramic Capacitor DC Bias Characteristics Figure 3. Ceramic Capacitor Temperature Characteristics Figure 4. Noise Resulting from Tapping on a Ceramic Capacitor DC BIAS VOLTAGE (V) 1965 F02 20 0 –20 –40 –60 –80 –100 0 4 8 10 26 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 1965 F03 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10μF 1ms/DIV 1mV/DIV 1965 F04 VOUT = 1.3V COUT = 10μF ILOAD = 0 |
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