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LM3405 Scheda tecnica(PDF) 11 Page - Texas Instruments |
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LM3405 Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 29 page LM3405 www.ti.com SNVS429B – OCTOBER 2006 – REVISED MAY 2013 Figure 20. Startup Response to VIN with EN/DIM delayed Figure 21. Startup Response to VIN with 200µs rise time LED PWM DIMMING The LED brightness can be controlled by applying a periodic pulse signal to the EN/DIM pin and varying its frequency and/or duty cycle. This so-called PWM dimming method controls the average light output by pulsing the LED current between the set value and zero. A logic high level at the EN/DIM pin turns on the LED current whereas a logic low level turns off the LED current. Figure 22 shows a typical LED current waveform in PWM dimming mode. As explained in the previous section, there is approximately a 100µs delay from the EN/DIM signal going high to fully establishing the LED current as shown in Figure 23. This 100µs delay sets a maximum frequency limit for the driving signal that can be applied to the EN/DIM pin for PWM dimming. Figure 24 shows the average LED current versus duty cycle of PWM dimming signal for various frequencies. The applicable frequency range to drive LM3405 for PWM dimming is from 100Hz to 5kHz. The dimming ratio reduces drastically when the applied PWM dimming frequency is greater than 5kHz. Figure 22. PWM Dimming of LEDs using the EN/DIM Pin Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3405 |
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