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ADD5207 데이터시트(PDF) 1 Page - Analog Devices |
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ADD5207 데이터시트(HTML) 1 Page - Analog Devices |
1 / 16 page Four-String, White LED Driver for LCD Backlight Applications Data Sheet ADD5207 Rev. A 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 www.analog.com Fax: 781.461.3113 ©2009–2012 Analog Devices, Inc. All rights reserved. FEATURES White LED driver based on inductive boost converter Integrated 40 V MOSFET with 1.5 A peak current limit Input voltage range: 6 V to 21 V Maximum output adjustable up to 36 V 600 kHz to 1 MHz adjustable operating frequency Typical 39 V fixed overvoltage protection (OVP) Built-in soft start for boost converter Drives up to 4 LED current strings LED current adjustable up to 25 mA for each channel Headroom control to maximize efficiency Fixed LED dimming frequency: 8 kHz LED open fault protection Brightness control with PWM input Dimming controls 4-channel operation: 90 degree phase shift between channels 3-channel operation: 120 degree phase shift between channels General Thermal shutdown Undervoltage lockout 14-lead, 4 mm × 3 mm LFCSP APPLICATIONS Notebook PCs, UMPCs, and monitor displays GENERAL DESCRIPTION The ADD5207 is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter tech- nology. It is designed with a 0.15 Ω, 1.5 A internal switch and a pin-adjustable operating frequency between 600 kHz and 1 MHz. The ADD5207 contains four regulated current sources for uniform LED brightness. Each current source can drive up to 25 mA and the LED-driving current is pin adjustable by an external resistor. The ADD5207 drives up to four parallel strings of multiple series-connected LEDs with a ±1.5% current matching between strings. The ADD5207 provides phase shift PWM brightness control methods. LED dimming control is achieved through the PWM input. The device includes an 8 kHz LED-dimming oscillator for driving each current source. The ADD5207 operates over an input voltage range of 6 V to 21 V, but the device can function with a voltage as low as 5.6 V. The ADD5207 also has multiple safety protection features to prevent damage during fault conditions. If any LED is open, the device automatically disables the faulty current source. The internal soft start circuit prevents a high inrush current during startup. Thermal shutdown protection prevents thermal damage. The ADD5207 is available in a low profile, thermally enhanced, 4 mm × 3 mm × 0.75 mm, 14-lead, RoHS-compliant lead frame chip scale package (LFCSP) and is specified over the industrial temperature range of −25°C to +85°C. TYPICAL APPLICATION CIRCUIT L1 10µH VIN RC 6.8kΩ CC 2.2nF RSET 180kΩ C2 OPEN CIN 10µF VIN ISET COMP GND SW D1 OVP FB1 FB2 FB3 FB4 14 13 4 5 6 7 12 11 3 1 + – PWM 9 RF 100kΩ FSLCT 2 CBYPASS 1µF VDD 8 COUT 4µF ADD5207 CIN2 0.1µF SHDN OFF ON 10 Figure 1. |
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