un501-1a20 led芯片

features
? 15ma~25ma single channel constant current regulator
? no external current setting resistor is needed
? 3 pin package
? 1.7v ~ 12v supply voltage
? 0.4v ~ 17v output voltage
(0.4v ~ 1v output voltage can work only when 5v vdd is applied.)
? vdd pin can be used as oe function
? 2us/2us current rising/falling time
? -40℃ ~ 120℃ junction operating temperature
? cascade-able for higher voltage applications*
(12v clamping voltage.)
? less than ±5% chip to chip current skew
? less than 1%/v load (or line) regulation
? pb-free & green package
* patent applied
product description
nu501 is a three pin general purpose current
regulation component that can be easily used in various led
lighting applications. with the excellent load/line regulation
and minimized chip current skew, nu501 keep led’s
current vary stable even when power or load fluctuate in a
wide range and make light intensity vary uniform in large
area of led light source.
except power supply function, the vdd pin of nu501
is output enable (oe) also, and can be used in digital pwm
controlled circuit to achieve more precise current adjusting
in gray level applications.
the minimized power supply voltage let nu501 be
used as a current regulative diode (crd) when vdd and vp
pin are tight together. this application makes nu501 very
easy to be used. just like a diode, when this diode is inserted
in led series, the current in circuit is regulated.
in high supply voltage and low led load voltage
applications, two or more nu501 can be connected in series
to share redundant high voltage. with the unique share
voltage technology of numen tech., the extra redundant
voltage can be shared by each nu501 by a reasonable
mechanism. this special capability let nu501 very suit for
the usage of wide range power supply that many liner type
led drivers cannot work.
applications
? general led lighting
? lcd back lighting
? led torch / flashlight