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LMZ20502SILR bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LMZ20502SILR bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 37 page 500µs/div Output Voltage 2V/div PG EN Input Current 1A/div 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Output Current (A) C001 LMZ20502 www.ti.com SNVS852C – JUNE 2012 – REVISED APRIL 2015 Feature Description (continued) Figure 9. Typical Current Limit Profile VIN = 5 V, VOUT = 1.8 V 8.3.4 Start-Up Start-up and shutdown of the LMZ20502 is controlled by the EN input. The characteristics of this input are found in the Electrical Characteristics table. A valid input voltage must be present on VIN before the enable control is asserted. The maximum voltage on the EN pin is 5.5 V or VIN, whichever is smaller. Do not allow this input to float. The LMZ20502 features a current limit based soft-start, that prevents large inrush currents and output overshoots as the regulator is starting up. The peak inductor current is stepped-up in a staircase fashion during the soft start period. A typical start-up event is shown in Figure 10: Figure 10. Typical Start-Up Waveforms, VIN = 5 V, VOUT = 3.3 V, IOUT = 1 A 8.3.5 Drop-Out Behavior When the input voltage is close to the output voltage the regulator will operate at very large duty cycles. Normal time delays of the internal circuits prevents the attainment of controlled duty cycles near 100%. In this condition the LMZ20502 will skip switching cycles in order to maintain regulation with the highest possible input-to-output ratio. Some increase in output voltage ripple may appear as the regulator skips cycles. As the input voltage gets closer to the output voltage, the regulator will eventually reach 100% duty cycle, with the high side switch turned on. The output will then follow the input voltage minus the drop across the high side switch and inductor resistance. Figure 11 and Figure 12 show typical drop-out behavior for output voltages of 2.5 V and 3.3 V. Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMZ20502 |
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