Start the burst brightness adjustment of the CCFL display in sequence
PUR cable is a type of cable that is specifically designed to withstand exposure to oil and other petroleum-based substances. The sheath of the cable is made from a material called polyurethane (PUR), which is known for its resistance to oil, chemicals, and abrasion. Oil Resistant PUR Sheathed Cable,Highly Resistant Against Wear Cable,Shielded Polyurethane Cable,Oil Resistant Cable Ruitian Cable CO.,LTD. , https://www.rtpowercable.com
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
The oil resistance of this type of cable makes it ideal for use in industrial environments where there is a high risk of exposure to oil or other similar substances. It can be used in applications such as oil refineries, chemical plants, and automotive manufacturing facilities.
The PUR sheath also provides excellent mechanical protection, making the cable highly durable and resistant to damage from impacts or abrasion. This makes it suitable for use in harsh environments where the cable may be subjected to heavy use or rough handling.
In addition to its oil resistance, PUR sheathed cable often has other desirable properties such as flame resistance, UV resistance, and flexibility. These properties make it a versatile choice for a wide range of applications where durability and reliability are important.
Overall, PUR cable is a reliable and durable option for applications that require protection against oil and other petroleum-based substances. Its ability to withstand harsh environments and resist damage makes it a popular choice in various industries.