NSI45025AT1G Constant Current Regulator & LED Driver 45 V, 25 mA 10%, 460 mW Package The linear constant current regulator (CCR) is a simple, economical and robust device designed to provide a costeffective solution for regulating current in LEDs (similar to Constant Current Diode, CCD). NSI45025AT1G ELECTRICAL CHARACTERISTICS (T = 25C unless otherwise noted) A Characteristic Symbol Min Typ Max Unit Steady State Current Vak = 7.5 V (Note 1) I 22.5 25 27.5 mA reg(SS) Voltage Overhead (Note 2) V 1.8 V overhead Pulse Current Vak = 7.5 V (Note 3) I 26.1 29.4 32.75 mA reg(P) Capacitance Vak = 7.5 V (Note 4) C 2.5 pF Capacitance Vak = 0 V (Note 4) C 5.7 pF 2 1. I steady state is the voltage (Vak) applied for a time duration 10 sec, using FR4 300 mm 1 oz. Copper traces, in still air. reg(SS) 2. V = V V . V is typical value for 80% I . overhead in LEDs overhead reg(SS) 3. I nonrepetitive pulse test. Pulse width t 300 sec. reg(P) 4. f = 1 MHz, 0.02 V RMS. Figure 1. CCR VoltageCurrent Characteristic