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MAX16822BASA+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX16822BASA+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 10 page 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense 8 _______________________________________________________________________________________ Freewheeling-Diode Selection For stability and best efficiency, a low forward-voltage drop diode with fast reverse-recovery time and low capacitance is recommended. A Schottky diode is a good choice as long as its breakdown voltage is high enough to withstand the maximum operating voltage. PCB Layout Guidelines Careful PCB layout is critical to achieve low switching losses and stable operation. Use a multilayer board whenever possible for better noise immunity. Minimize ground noise by connecting high-current ground returns, the input bypass-capacitor ground lead, and the output-filter ground lead to a single point (star ground configuration). In normal operation, there are two power loops. One is formed when the internal MOSFET is on and the high current flows through IN, RSENSE, LED load, the inductor, the internal MOSFET, and GND. The other loop is formed when the internal MOSFET is off and the high-current circulates through RSENSE, LED load, the inductor, and the freewheeling diode. Minimize each loop area to reduce noise interaction. Place RSENSE as close as possible to CS and IN. For better noise immunity, a Kelvin connection between CS and RSENSE is strongly recommended. fSW t t t2 ΔI t1 AVG. LED CURRENT HYSTERETIC MODE ILED VDIM Figure 2. Current-Regulator Operation |
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