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LT1460 Datasheet(PDF) 16 Page - Linear Technology |
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LT1460 Datasheet(HTML) 16 Page - Linear Technology |
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16 / 24 page  LT1460 16 1460f LT1460-5 RL VOUT VGEN 1460 F06 CIN 0.1 µF 5V 4V CL VIN = 5V 2 µs/DIV 5V 4V RL = 10k RL = 1k 1460 F07 VGEN VOUT VOUT 10 µs/DIV 5V 4V RL = 10k RL = 1k 1460 F08 VGEN VOUT VOUT APPLICATIO S I FOR ATIO RS = 2Ω and CL = 1µF. RS should not be made arbitrarily large because it will limit the load regulation. Figure 6 to Figure 8 illustrate response in the LT1460-5. The 1V step from 5V to 4V produces a current step of 1mA or 100µA for RL = 1k or RL = 10k. Figure 7 shows the response of the reference with no load capacitance. The reference settles to 5mV (0.1%) in less than 2µs for a 100µA pulse and to 0.1% in 3µs with a 1mA step. When load capacitance is greater than 0.01µF, the reference begins to ring due to the pole formed with the output impedance. Figure 8 shows the response of the reference to a 1mA Figure 6. Response Time Test Circuit Figure 8. CL = 0.01µF Figure 7. CL = 0 and 100µA load current step with a 0.01µF load capacitor. Figure 9 to Figure 11 illustrate response of the LT1460-10. The 1V step from 10V to 9V produces a current step of 1mA or 100µA for RL = 1k or RL = 10k. Figure 10 shows the response of the reference with no load capacitance. The reference settles to 10mV (0.1%) in 0.4µs for a 100µA pulse and to 0.1% in 0.8µs with a 1mA step. When load capacitance is greater than 0.01µF, the reference begins to ring due to the pole formed with the output impedance. Figure 11 shows the response of the reference to a 1mA and 100µA load current step with a 0.01µF load capacitor. Figure 11. CL = 0.01µF Figure 10. CL = 0 Figure 9. Response Time Test Circuit LT1460-10 RL VOUT VGEN 1460 F09 CIN 0.1 µF 10V 9V CL VIN = 12.5V 2 µs/DIV 10V 9V RL = 10k RL = 1k 1460 F10 VGEN VOUT VOUT 10 µs/DIV 10V 9V RL = 10k RL = 1k 1460 F11 VGEN VOUT VOUT |
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