NCL30100SNT1G ON Semiconductor

NCL30100 Fixed Off Time Switched Mode LED Driver Controller The NCL30100 is a compact switching regulator controller intended for space constrained constant current highbrightness LED driver applications where efficiency and small size are important. The NCL30100 6.5 24 V + LED2 C1 R1 R2 LED1 IC1 D1 R3 NCL30100 LEDX CS DRV L1 GND VCC CT IVC Q1 C2 D2 C3 R4 Figure 1. Typical Application Example of the LED Converter PIN FUNCTION DESCRIPTION Pin N Pin Name Function Pin Description 1 CS Current sense input A resistor divider consisting of R3 and R4 is used to set the peak current sensed through the MOSFET switch 2 GND Ground Power ground. 3 C Timing capacitor Capacitor to establish the off time duration T 4 IVC Input voltage compensation The current injected into the input varies the switch off time and I allowing for PK feedforward compensation. 5 V Input supply Supply input for the controller. The input is rated to 18 V but as illustrated CC Figure 1, a simple zener diode and resistor can allow the LED string to be powered from a higher voltage 6 DRV Driver output Output drive for an external power MOSFET