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LM3405 Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte LM3405
Spiegazioni elettronici  Constant Current Buck Regulator
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Produttore elettronici  TI1 [Texas Instruments]
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LM3405
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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
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