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