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NJU6052 Datasheet

  • NJU6052

  • White LED Driver with Automatic Dimming Control

  • 23頁

  • NJRC

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NJU6052
PRELIMINARY
White LED Driver with Automatic Dimming Control
!
GENERAL DESCRIPTION
The
NJU6052
is a white LED driver with an automatic
dimming control. It contains an output driver, a PWM
controller, a luminance sensor control (power supply for
sensor & A/D converter), a step-up DC/DC converter, a serial
interface, etc.
The output driver ensures a 60mA maximum capability
which allows the connection of 12 white LEDs (4 series x 3
parallels). Depending on the ambient light sensed with an
external luminance sensor, the PWM controller controls
PWM duty in 8 steps preselected out of 64 steps. In addition,
the frequency of the DC/DC converter is high so that it
permits the use of small, low-profile inductors and capacitors
to minimize the footprint in space-conscious applications.
All of these benefits make the
NJU6052
suitable for the
battery-powered portable applications such as a cellular
phone, a camcorder, PDA, etc.
!
PACKAGE OUTLINE
NJU6052KN1
NJU6052V
!
FEATURES
#
Drives up to 12 white LEDs (4 series x 3 parallels)
#
#
#
#
#
#
#
#
V
SW
= 18.0V(Max.), I
OUT
= 60mA
Built-in PWM Dimming Control
(Selectable 8 out of 64 steps)
Built-in Luminance Sensor Control (Power Supply for Sensor & A/D converter)
(No MPU-access required after initial setting)
Built-in Temperature Compensation Circuit to Suppress the Characteristic Degradation of LEDs
Uses Small Inductor and Capacitors
1.8V to 3.6V Operating Voltage for Logic Circuits (V
DDL
)
3.0V to 5.5V Operating Voltage for Step-up Circuits (V
DD
)
CMOS Technology
Package
: QFN28 / SSOP20
Ver.2004-02-26
-1-

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