Keywords: white LEDs, LED drivers, matched transistor pair, high-side current sensing
where VSENSE is the current-sense voltage between CS+ and CS- (203mV). For best accuracy, choose R4 so the two transistor currents are about the same:
where VLED is the nominal LED voltage at the desired load. This additional low-cost circuitry keeps the CS-pin voltages near ground, and allows the sense resistor (R1) to be at any voltage up to the 45V limit of U1.
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APPLICATION NOTE 4537,AN4537, AN 4537, APP4537, Appnote4537, Appnote 4537
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