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LD1611 Folha de dados(PDF) 8 Page - LDT Co., Ltd |
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LD1611 Folha de dados(HTML) 8 Page - LDT Co., Ltd |
8 / 13 page Ver1.1 8 LDT Inc. WE bldg. 5F, 126-33 Han-dle 1ro, Seobuk-gu, Cheonan, Chungnam, korea, 331-220 Tel. +82 41 520 7300 Fax. +82 41 520 7337 www.ldt.co.kr LD1611 High Power LED Driver 11.2 Setting the Output Current with Resistor (R) If R pin voltage is below 0.2V then the switch is on. R pin voltage is over 0.2V then the switch is off. So, typical peak to peak ripple current in the inductor is 15% of LED current (if). if = 350mA setting ia = if + Δif/2 = 350mA + 350mA x 0.15/2 = 376.25mA Δif ≈ 15%x if Va = R x ia R = Va / ia = 0.2V / 376.25mA ≈ 533mΩ if = 800mA setting ia = if + Δif/2 = 800mA + 800mA x 0.15/2 = 860mA Δif ≈ 15%x if Va = R x ia R = Va / ia = 0.2V / 860mA ≈ 244mΩ if = 1500mA setting ia = if + Δif/2 = 1500mA + 1500mA x 0.15/2 = 1612.5mA Δif ≈ 15%x if Va = R x ia R = Va / ia = 0.2V / 1612.5mA ≈ 124mΩ 11.3 Inductor Selection Higher values of inductance are recommended at higher supply voltage in order to minimize errors due to switching delays, which results in increased ripple and low efficiency. High value of inductance also results in a smaller change in output current (if) over the supply voltage range. L = VLED x toff / Δif VLED = Vf x N N = # of LEDs in series Toff = 1.5us Δif = 15% x if If N = 3, if = 350mA, Vf = 3V L = 3V x 3 x 1.5us / ( 0.15 x 350mA ) ≈ 257uH |
Nº de peça semelhante - LD1611 |
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Descrição semelhante - LD1611 |
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