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NSIC2020JBT3G Datasheet(PDF) 6 Page - ON Semiconductor |
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NSIC2020JBT3G Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 8 page NSIC2020JBT3G http://onsemi.com 6 Higher Current LED Strings Two or more fixed current CCRs can be connected in parallel. The current through them is additive (Figure 11). Figure 11. Other Currents The adjustable CCR can be placed in parallel with any other CCR to obtain a desired current. The adjustable CCR provides the ability to adjust the current as LED efficiency increases to obtain the same light output (Figure 12). Figure 12. Dimming using PWM The dimming of an LED string can be easily achieved by placing a BJT in series with the CCR (Figure 13). Figure 13. The method of pulsing the current through the LEDs is known as Pulse Width Modulation (PWM) and has become the preferred method of changing the light level. LEDs being a silicon device, turn on and off rapidly in response to the current through them being turned on and off. The switching time is in the order of 100 nanoseconds, this equates to a maximum frequency of 10 Mhz, and applications will typically operate from a 100 Hz to 100 kHz. Below 100 Hz the human eye will detect a flicker from the light emitted from the LEDs. Between 500 Hz and 20 kHz the circuit may generate audible sound. Dimming is achieved by turning the LEDs on and off for a portion of a single cycle. This on/off cycle is called the Duty cycle (D) and is expressed by the amount of time the LEDs are on (Ton) divided by the total time of an on/off cycle (Ts) (Figure 14). Figure 14. |
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