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LM3554TMX/NOPB Datasheet(PDF) 39 Page - Texas Instruments |
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LM3554TMX/NOPB Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 47 page  39 LM3554 www.ti.com SNVS549C – JUNE 2009 – REVISED FEBRUARY 2016 Product Folder Links: LM3554 Submit Documentation Feedback Copyright © 2009–2016, Texas Instruments Incorporated Time Base: 100 µs/div ILED = 1.2 A VOUT = 5 V Ch 1: VOUT (2 V/div) Ch 2: IL (1 A/div) Single LED Ch 4: ILED (500mA/div) Ch 3: ENVM (5 V/div) Figure 63. Flash Pulse and VOUT to Flash Pulse Time Base: 200 µs/div Circuit of Figure 43 Single LED ILED = 1.2 A Ch 3: NTC pin voltage (5 V/div) Ch 4: ILED (500 mA/div) R(T) = 100 k Ω at 25°C R3 = 9 k Ω Figure 64. NTC Mode Response Time Base: 100 ms/div ILED = 1.2 A 3.1-V UVLO Setting Ch 3: VIN (1V/div) Ch 4: ILED (500 mA/div) Single LED Figure 65. VIN Monitor Response 9 Power Supply Recommendations The LM3554 is designed to operate from an input supply range of 2.5 V to 5.5 V. This input supply must be well regulated and provide the peak current required by the LED configuration and inductor selected. |
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