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NCP5005 Datasheet(PDF) 8 Page - ON Semiconductor |
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NCP5005 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 23 page NCP5005 http://onsemi.com 8 Output Current Range Set−Up The current regulation is achieved by means of an external sense resistor connected in series with the LED string. CONTROLLER GND 3 FB GND 1 Vout D1 Q1 Figure 8. Output Current Feedback Vbat L1 22 mH R1 x W The current flowing through the LED creates a voltage drop across the sense resistor R1. The voltage drop is constantly monitored internally, and maximum peak current allowed in the inductor is set accordingly in order to keep constant this voltage drop (and thus the current flowing through the LED). For example, should one need a 10 mA output current, the sense resistor should be sized according to the following equation: R1 + Feedback Threshold Iout + 200 mV 10 mA + 20 W (eq. 9) A standard 5% tolerance resistor, 22 W SMD device, yields 9.09 mA, good enough to fulfill the back light demand. The typical application schematic diagram is provided in Figure 9. Figure 9. Basic Schematic Diagram GND EN 2 1 5 Vout Vbat NCP5005 L1 22 mH Vbat C1 4.7 mF GND D6 D5 D4 D3 U1 4 D2 GND 3 GND R1 22 W D1 MBR0530 GND C2 1.0 mF FB Pulse LWT67C LWT67C LWT67C LWT67C LWT67C |
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