cs8801 Chiplus Semiconductor Corp., cs8801 Datasheet - Page 4

• Manufacturer Part Number: cs8801
• Description: 18v/1a High Brightness Constant Current Led Driver
• Manufacturer: Chiplus Semiconductor Corp.

Output Current Setting
typical application schematic. Use the following equation to calculate the value of this resistor:
Where V
Switching Frequency
conditions and components. Use the following equation to determine the operating frequency:
Where n is the number of LEDs, V
Inductor Selection
Diode Selection
good choice as long as the breakdown voltage is high enough to withstand the maximum operating voltage.
The forward current rating of the diode must be at least equal to the maximum LED current.
The LED average current is programmed using a resistor between VIN and CS, show as R
Although hysteretic control is a simple control method, the switching frequency depends on application
The inductor value can be calculated from a known frequency by re-arranging the same equation:
The forward voltage of the diode should be as low as possible for better efficiency. A Schottky diode is a
Applications Information
Order Information
SEN
CS8801NP
is 500mV typically, and I
Chiplus reserves the right to change product or specification without notice.
Part No.
18V/1A High Brightness LED Driver
LED
f
LED
L
SW
is the forward voltage drop of 1 LED, and ∆V is 50mV.
is the DC average LED current.
V
V
IN
IN
Package Type
R
n
8SOP(mil)
n
V
SEN
V
IN
V
V
4
LED
IN
LED
V
I
V
LED
SEN
n
V
n
f
V
SW
V
L
LED
LED
R
R
SEN
SEN
Lead Pitch
mm
SEN
CS8801
in the
Rev. 1.1