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SC4538EVB Datasheet(PDF) 8 Page - Semtech Corporation |
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SC4538EVB Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 14 page 8 Pin Descriptions Pin # Pin Name Pin Function 1LX Collector of the internal power transistor — connect to the boost inductor and rectifying Schottky diode. 2 EN Enable and brightness control pin for LED string 3 ISET Output current set pin — connect a resistor from this pin to GND to set the maximum current. 4 COMP Output of the internal transconductance error amplifier — this pin is used for loop compensation and soft-start. Connect a 1.27 Ohm resistor and 47nF capacitor in series to GND. 5 OUT Boost output voltage monitor pin — internal over-voltage protection monitors the voltage at this pin. Connect this pin to the output capacitor and the anode of the LED string. 6 BL LED constant current sink — connect this pin to the cathode of the LED 7 GND Ground 8 IN Power supply pin — bypass this pin with a capacitor close to the pin T Thermal Pad Pad for heatsinking purposes — connect to the ground plane using multiple vias. Not connected internally. SC4538 |
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