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LT1460EIN8-10 Datasheet(PDF) 6 Page - Linear Technology |
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LT1460EIN8-10 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page ![]() 6 LT1460-10 APPLICATIONS INFORMATION current step of 1mA or 100 µA for RL = 1k or RL = 10k. Figure 2 shows the response of the reference with no load capacitance. The reference settles to 10mV (0.1%) in 0.4 µs for a 100µA pulse and to 0.1% in 0.8 µs with a 1mA step. When load capacitance is greater than 0.01 µF, the reference begins to ring due to the pole formed with the output impedance. Figure 3 shows the response of the reference to a 1mA and 100 µA load with a 0.01µF load capacitor. Fast Turn-On It is recommended to add a 0.1 µF or larger input capacitor to the input pin of the LT1460-10. This helps stability with large load currents and speeds up turn-on. The LT1460-10 can start in 10 µs, but it is important to limit the dv/dt of the input. Under light load conditions and with a very fast input, internal nodes overslew and this requires finite recovery time. Figure 4 shows the result of no bypass capacitance on the input and no output load. In this case the supply dv/dt is 12.5V in 30ns which causes internal overslew, and the output does not bias to 10V until 60 µs. A 0.1 µF input capacitor guarantees the part always starts quickly as shown in Figure 5. Figure 3. CL = 0.01µF 10 µs/DIV 1460-10 F03 2 µs/DIV 1460-10 F02 10V 9V Figure 2. CL = 0 10V 9V RL = 10k RL = 1k 20 µs/DIV 1460-5 F04 Figure 5. CIN = 0.1µF 12.5V 20 µs/DIV 1460-10 F04 Figure 4. CIN = 0 Figure 1. Response Time Test Circuit VOUT VOUT VGEN RL = 10k RL = 1k VGEN VOUT VOUT VIN VOUT 0V 0V 0V 12.5V 0V VIN VOUT LT1460-10 RL VOUT VGEN 1460-10 F01 CIN 0.1 µF 10V 9V CL VIN = 12.5V |
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