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MAX16822BASA+ Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX16822BASA+ Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 10 page 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense _______________________________________________________________________________________ 5 Typical Operating Characteristics (continued) (VIN = VDIM = 48V, CVCC = 1µF, RSENSE = 0.62 Ω, L = 220µH (connected between IN and CS). Typical values are at TA = +25°C, unless otherwise noted.) LXRDSON vs. TEMPERATURE TEMPERATURE ( °C) 110 95 80 65 50 35 20 5 -10 -25 0.5 0.6 0.7 0.8 0.9 1.0 0.4 -40 125 VIN = 6.5V VIN = 65V VIN = 48V ITEMP_I vs. TEMPERATURE 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 25.0 TEMPERATURE ( °C) 110 95 80 65 50 35 20 5 -10 -25 -40 125 VIN = 48V Pin Description PIN NAME FUNCTION 1 CS Current-Sense Input. Connect a resistor between IN and CS to program the LED current. 2 IN Positive Supply Voltage Input. Bypass with a 1μF or higher value capacitor to GND. 3 GND Ground 4 PGND Power Ground 5, 6 LX Switching Node 7 DIM Logic-Level Dimming Input. Drive DIM low to turn off the current regulator. Drive DIM high to enable the current regulator. 8 TEMP_I Thermal Foldback Control and Linear Input. Bypass with a 0.01μF capacitor to GND if thermal foldback or analog dimming is used. See the Thermal Foldback section for more details. Detailed Description The MAX16822A/MAX16822B are step-down, constant- current, high-brightness LED (HB LED) drivers. These devices operate from a +6.5V to +65V input-voltage range. The maximum output current is 500mA, if the part is used at temperatures up to +105°C, or 350mA, if it is used up to +125°C. A high-side current-sense resistor sets the output current and a dedicated PWM dimming input enables pulsed LED dimming over a wide range of brightness levels. A high-side current-sensing scheme and an on-board current-setting circuitry minimize the number of exter- nal components while delivering LED current with ±3% accuracy, using a 1% sense resistor. See Figure 1 for an internal block diagram. |
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