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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM3421 датащи(PDF) 16 Page - National Semiconductor (TI) |
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LM3421 датащи(HTML) 16 Page - National Semiconductor (TI) |
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16 / 24 page  bring the current down below the 30% high threshold and the fault timer interval. For short timer intervals, the controller simply shuts off in the fault lockdown mode. The user will ob- serve the LEDs blink on once at power up should this condi- tion exist. This overshoot of current can be prevented by adding a control zero into the system as detailed in Figure 7. Simply adding the shaded components eliminates this issue (see Figure 8). Note that for many configurations these com- ponents will not be required. 30067305 FIGURE 7. Boost LED Driver with Lead Compensation 30067372 I LED = 1A nominal, VIN = 12V, VLED(s) = 20V, no lead compensation Top trace: EN input, 1V/div, DC Bottom trace: I LED, 500mA/div, DC T = 1ms/div 30067373 I LED = 1A nominal, VIN = 12V, VLED(s) = 20V, with lead compensation Top trace: EN input, 1V/div, DC Bottom trace: I LED, 500mA/div, DC T = 1ms/div FIGURE 8. Scope Plots for Startup With and Without Lead Compensation www.national.com 16 |
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