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ADD5203ACPZ-RL Arkusz danych(PDF) 1 Page - Analog Devices |
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ADD5203ACPZ-RL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 24 page 8-String, White LED Driver with SMBus and PWM Input for LCD Backlight Applications ADD5203 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2010 Analog Devices, Inc. All rights reserved. FEATURES White LED driver based on inductive boost converter Integrated 50 V MOSFET with 2.9 A peak current limit Input voltage range: 6 V to 21 V Maximum output adjustable up to 45 V 350 kHz to 1 MHz adjustable operating frequency Overvoltage protection (OVP) up to typical 47.5 V Built-in soft start for boost converter Drives up to eight LED current strings LED current adjustable up to 30 mA for each channel Headroom control to maximize efficiency Adjustable dimming frequency: 200 Hz to 10 kHz LED open and short fault protection Selectable dimming control interface methods PWM input SMBus serial input Selectable dimming modes Fixed delay PWM dimming control with 8-bit resolution No delay PWM dimming control with 8-bit resolution Direct PWM dimming control DC current dimming control with 8-bit resolution General Thermal shutdown Undervoltage lockout 28-lead, 4 mm × 4 mm × 0.75 mm LFCSP_WQ APPLICATIONS Notebook PCs, UMPCs, and monitor displays FUNCTIONAL BLOCK DIAGRAM STEP-UP SWITCHING REGULATOR EIGHT CURRENT SOURCES PWM DUTY EXTRACTOR 8-BIT BRIGHTNESS CONTROL LOGIC FIXED DELAY/NO DELAY DIRECT PWM/ DC CURRENT DIMMING CONTROL WITH PWM AND/OR SMBus INTERFACE UNDERVOLTAGE LOCKOUT INTERNAL SOFT START THERMAL PROTECTION OVERVOLTAGE PROTECTION AUTODISABLE FOR LED OPEN/SHORT Figure 1. GENERAL DESCRIPTION The ADD5203 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, 2.9 A internal switch and a pin-adjustable operating frequency between 350 kHz and 1 MHz. The ADD5203 contains eight regulated current sources for uniform brightness intensity. Each current source can be driven up to 30 mA, and the LED driving current is pin adjustable by an external resistor. The ADD5203 drives up to eight parallel strings of multiple series connected LEDs with a ±1.5% current matching between strings. The ADD5203 provides various dimming modes. Each dimming mode is selectable with an external dimming mode selection pin. The LED dimming control interface can be achieved through PWM input and/or SMBus. The device provides adjustable output dimming frequency range from 200 Hz to 10 kHz by an external resistor and capacitor. The ADD5203 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 ADD5203 also has multiple safety protection features to prevent damage during fault conditions. If any LED is open or short, the device automatically disables the faulty current source. The internal soft start prevents inrush current during startup. Thermal shutdown protection prevents thermal damage. The ADD5203 is available in a low profile, thermally enhanced, 4 mm × 4 mm × 0.75 mm, 28-lead, RoHS-compliant lead frame chip scale package (LFCSP_WQ) and is specified over the industrial temperature range of −25°C to +85°C. |
Podobny numer części - ADD5203ACPZ-RL |
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Podobny opis - ADD5203ACPZ-RL |
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