LM3407EVAL National Semiconductor, LM3407EVAL Datasheet
LM3407EVAL
Specifications of LM3407EVAL
Related parts for LM3407EVAL
LM3407EVAL Summary of contents
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... Pulse Level Modulation (PLM) control scheme which ensures the accuracy of the constant current output well with- in 10% over input voltage and operating temperature ranges Evaluation Board Schematic © 2009 National Semiconductor Corporation National Semiconductor Application Note 1763 SH Wong January 21, 2009 with an external 1% thick film current setting resistor ...
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FIGURE 2. LM3407 Evaluation Board PCB Top Overlay www.national.com FIGURE 3. LM3407 Evaluation Board PCB Top View 2 30046702 30046703 ...
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FIGURE 4. LM3407 Evaluation Board PCB Bottom View Evaluation Board Quick Setup Procedures Step 1 Remove all jumpers on the evaluation board. 2 Connect the LED array of 6 power LEDs to J1. 3 Connect Power Supply output to the ...
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Design Procedure CONNECTING TO LED ARRAY The LM3407 evaluation board features a female 6-pin SIP connector J1 for board-to-board connection of the LED array. Figure 5 shows the pin-out of J1. To avoid damaging the FIGURE 5. Connecting an LED ...
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Switching Frequency VS 25°C) A The LM3407 is internally compensated and requires no ex- ternal components for feedback compensation. The compo- nents of this evaluation board are optimized for driving 6 power LEDs with the input voltage ...
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LED DIMMING There are two ways to disable the current output (I evaluation board circuit. The current output of the LM3407 evaluation board can be disabled by connecting either the DIM or EN pin to ground. Connecting the EN pin ...
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PCB LAYOUT GUIDE Since copper traces of PCBs carry resistance and parasitic inductance, the longer the copper trace, the higher the resis- tance and inductance. These factors introduce voltage and current spikes to the switching nodes and impair the perfor- ...
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Typical Performance and Waveforms specified. Efficiency vs Input Voltage (T = -40°C) A Efficiency vs Input Voltage (T = 125°C) A Inductor Current @ 12V, 2LEDs 33µH) IN www.national.com All curves and waveforms taken at ...
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Inductor Current @ f = 1MHz 24V, 2LEDs 33µH) IN DIM Pin Enable (V = 24V, 2LEDs 33µ 500kHz Inductor Current @ 24V, 2LEDs ...
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