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ADD5211ACPZ-RL Scheda tecnica(PDF) 1 Page - Analog Devices |
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ADD5211ACPZ-RL Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 6 page 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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