LM3401EVAL National Semiconductor, LM3401EVAL Datasheet
LM3401EVAL
Specifications of LM3401EVAL
Related parts for LM3401EVAL
LM3401EVAL Summary of contents
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... FIGURE 1. Complete LM3401 Demo Board Schematic TABLE 1. LED current setting resistors (* = default value) LED average current 340 mA * 700 mA 1.0A © 2008 National Semiconductor Corporation National Semiconductor Application Note 1657 Allan Fisher July 29, 2008 in Table 4. The pcb layout is shown in Figure 11 and Figure 12. ...
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Connecting the LED Array The LM3401 demo board includes a female 6-pin SIP con- nector as well as two turret posts for the cathode and anode connections of the LED array. These are labeled “LED+” and “LED-“. Either connection can ...
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Typical Performance Characteristics Unless otherwise specified, the following conditions apply: Vin = 24V 25°C, LED = 2 x Osram Golden Dragon (Vf = 3.4V 350 mA) FIGURE 3. CS, SNS, and LED Current Waveforms FIGURE 4. ...
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FIGURE 9. Efficiency vs Input Voltage Driving 700 mA and 1A LEDs LED String Options The default LED current setting is 340 mA, typical of many 1W LEDs. To adjust this value, the current setting resistor, R1, can be changed ...
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TABLE 4. BOM for 3.5A Application (Vin = 5V to 20V) Ref. # Description IC1 LED Controller L1 5.2 µH, 5A, Inductor Q1 20V, 4A, 25 mΩ, PFET D1 30V, 4A, Schottky C1 25V, 10 µF, ceramic C2 50V, 33 ...
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FIGURE 12. Bottom Side PCB Layout 6 30025412 ...
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Notes 7 www.national.com ...
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