Abstract: In order to reduce the demand for the instantaneous current of the DC inverter, the DS3984 / DS3988 cold cathode fluorescent lamp controller adopts the method of sequentially starting burst brightness adjustment to control each channel of the LCD display.
Figure 1 shows the sequence start delay of channel 1 to channel 4 provided by the DS3984 / DS3988 cold cathode fluorescent lamp controller. The DS3988 8-channel controller or the DS3984 / DS3988 series-connected multi-channel controller use the same working mode.
Figure 1. Delay for DS3984 / DS3988 to start burst dimming sequentially (channel 1 to channel 4)
The waveform shown in Figure 2 is the current demand for the DC inverter power supply in the sequential startup mode. In this example, the range of the burst brightness adjustment is 50%, the power supply current slowly climbs to 3A, and then slowly decreases to 0A.
Figure 2. Supply current of the DC inverter in 50% burst dimming mode
Figure 1 shows the sequence start delay of channel 1 to channel 4 provided by the DS3984 / DS3988 cold cathode fluorescent lamp controller. The DS3988 8-channel controller or the DS3984 / DS3988 series-connected multi-channel controller use the same working mode.
Figure 1. Delay for DS3984 / DS3988 to start burst dimming sequentially (channel 1 to channel 4)
The waveform shown in Figure 2 is the current demand for the DC inverter power supply in the sequential startup mode. In this example, the range of the burst brightness adjustment is 50%, the power supply current slowly climbs to 3A, and then slowly decreases to 0A.
Figure 2. Supply current of the DC inverter in 50% burst dimming mode
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