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LM3554 bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM3554 bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 47 page 9 LM3554 www.ti.com SNVS549C – JUNE 2009 – REVISED FEBRUARY 2016 Product Folder Links: LM3554 Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated Typical Characteristics (continued) VIN = 3.6 V, LEDs are Lumiled PWF-4, COUT = 10 µF, CIN = 4.7 µF, L = FDSE0312-2R2 (2.2 µH, RL = 0.15 Ω), TA = 25°C, unless otherwise specified. (1) The typical curve for Current Limit is measured in closed loop using the Typical Application Circuit by increasing IOUT until the peak inductor current stops increasing. The value given in Electrical Characteristics is measured open loop and is found by forcing current into SW until the current limit comparator threshold is reached. Closed loop data appears higher due to the delay between the comparator trip point and the NFET turning off. This delay allows the closed-loop inductor current to ramp higher after the trip point by approximately 20 ns × VIN / L. VLED = 1.5 V Figure 14. Active (Non-Switching) Supply Current vs VIN VOUT = 5 V IOUT = 400 mA Figure 15. Active (Switching) Supply Current vs VIN Figure 16. Closed Loop Current Limit vs VIN (Flash Duration Register Bits [6:5] = 00)(1)) Figure 17. Closed Loop Current Limit vs VIN (Flash Duration Register Bits [6:5] = 01)(1) ) Figure 18. Closed Loop Current Limit vs VIN (Flash Duration Register Bits [6:5] = 10)(1)) Figure 19. Closed Loop Current Limit vs VIN (Flash Duration Register Bits [6:5] = 11)(1)) |
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