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SN3910 Datasheet
Universal High Brightness LED Driver
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SN3910 pdf
Preliminary
SN3910
Universal High Brightness LED Driver
General Description
The SN3910 is an open loop, current mode, control LED
driver IC. The SN3910 operates constant off-time mode. It
allows efficient operation of High Brightness (HB) LEDs
from voltage sources ranging from 8VDC up to 450VDC or
110VAC/220VAC. The SN3910 includes a PWM dimming
input that can accept an external control signal with a duty
ratio of 0 - 100% and a frequency of up to a few kilohertz.
It also includes a 0 - 250mV linear dimming input which
can be used both for linear dimming and temperature
compensation of the LED current.
The SN3910 is ideally suited for buck LED drivers. Since
the SN3910 operates in open loop current mode control, the
controller achieves good output current regulation without
the need for any loop compensation. PWM dimming
response is limited only by the rate of rise and fall of the
inductor current, enabling very fast rise and fall times.
Features
z Switch mode controller for single switch LED drivers
z Open loop peak current controller
z Wide input range from 8VDC to 450VDC or
110VAC/220VAC
z Application from a few mA to more than 1A output
z Up to hundreds of LEDs
z Constant off-time operation
z Linear and PWM dimming capability
z Requires few external components for operation
z Temperature compensation to regulate LED current
z SOP-8 package
Applications
z DC/DC or AC/DC LED driver applications
z RGB backlighting LED driver
z General purpose constant current source
z Signal and decorative LED lighting
Application Circuit
VINDC
8~450V
RIN
CIN
R1
Themistor
NTC
Close to LED
D1
VIN
SN3910
PWMD
GATE
VREF
L1
Q1
LD
TOFF
CS
GND
RCS
COFF
CO
Jul 2008 Ver0.1
1 SI-EN Technology

SN3910 Datasheet PDF



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