Datasheet AD8240 (Analog Devices) - 2

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AD8240 TABLE OF CONTENTS
Specifications... 3 Using/Evaluating the AD8240 LED Driver Monitor ..6 Absolute Maximum Ratings.. 4 Setup..6 Product Description... 5 Controlling the LED lamp..7 Linear Regulator (Block A) ... 5 Using/Evaluating the VSense Output ...7 High-Side Current-Sense Amplifier with Open LED Advantages of Driving LED Lamps with Constant Voltage ..8 Detection (Block B).. 5 Background ..8 Comparator with Latch-off OverCurrent Protection Monitoring the LEDs ..8 (Block C).. 5 Driving Automotive LEDs..8 Intelligent Driver (Block D) .. 5 Outline Dimensions ... 10 Ordering Guide .. 11
REVISION HISTORY 4/04—Revision 0: Initial Version
Rev. 0 | Page 2 of 12 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS PRODUCT DESCRIPTION LINEAR REGULATOR (BLOCK A) HIGH-SIDE CURRENT-SENSE AMPLIFIER WITH OPEN LED DETECTION (B COMPARATOR WITH LATCH-OFF OVERCURRENT PROTECTION (BLOCK C) INTELLIGENT DRIVER (BLOCK D) USING/EVALUATING THE AD8240 LED DRIVER MONITOR SETUP Shunt Resistor Selection Circuit Configuration CONTROLLING THE LED LAMP USING/EVALUATING THE VSENSE OUTPUT Using/Evaluating the Short-Circuit Protection Feature ADVANTAGES OF DRIVING LED LAMPS WITH CONSTANT VOLTAGE BACKGROUND MONITORING THE LEDS DRIVING AUTOMOTIVE LEDS Constant Current Constant Voltage OUTLINE DIMENSIONS ORDERING GUIDE