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ADD5211ACPZ-RL Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte ADD5211ACPZ-RL
Spiegazioni elettronici  Four-String, White LED Driver for LCD Backlight Applications
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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ADD5211ACPZ-RL Scheda tecnica(HTML) 1 Page - Analog Devices

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Four-String, White LED Driver
for LCD Backlight Applications
Preliminary Technical Data
ADD5211
Rev. PrA
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
White LED driver based on an inductive boost controller
Wide input voltage range: 4.5 V to 40 V
Adaptive output voltage to minimize power dissipation
Adjustable operating frequency: 200 kHz to 1.2 MHz
Programmable UVLO
Programmable soft start time for boost converter
Programmable external MOSFET switching rising/falling time
Drives up to 4 LED current sinks with internal MOSFETs
Brightness control with PWM input
Adjustable LED current: 40 mA up to 200 mA
Headroom control to maximize efficiency
LED dimming frequency: up to 25 kHz
1000:1 PWM dimming at 300 Hz
Open drain fault indicator
LED open and LED short fault protection
Thermal shutdown
Undervoltage lockout
24-lead, 4 mm × 4 mm LFCSP
APPLICATIONS
LCD monitor and TV LED backlights
Industrial lighting
GENERAL DESCRIPTION
The ADD5211 is a 4 channel, white LED driver for backlight
applications based on high efficiency, current mode, step-up
converter technology. The boost controller drives an external
MOSFET switch for step-up regulation from an input voltage of
4.5 V to 40 V and a pin adjustable operating frequency between
200 kHz and 1.2 MHz. An adjustable UVLO function is
implemented to reduce input current during power-off.
The ADD5211 contains four regulated current sinks for uniform
brightness intensity. Each current sinks can be driven from 40
mA up to 200 mA and the LED driving current is pin adjustable
by an external resistor. The ADD5211 with an input PWM
interface drives up to four parallel strings of multiple series
connected LEDs with ±1.5% current matching between strings.
Additional features include fault indicator output LED short
protection, LED open protection, boost output short protection,
overvoltage protection, cycle-by-cycle current limit, and
thermal shutdown for both the IC and LED array. The
programmable soft start is implemented to reduce inrush
current during startup.
TYPICAL APPLICATION
VIN
UVLO
GATE_P GATE_N
+
OFF ON
EN
ISET
LSD
VDD
FAULT
PWM
VDR
LGND
OVP
FB4
FB3
FB2
FB1
PGND
RAMP
CS
FREQ
COMP
AGND
SS
ADD5211
VIN
Figure 1.


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