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MAX16840ATB+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX16840ATB+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 12 page The output voltage of the LED string is given by VLED. As a first-order approximation, the LED voltage is assumed constant. The duty cycle at the peak of the input voltage is, therefore: × = − = − + + × MIN LED LED 13.2V 2 18.66V D1 1 V 18.66V V 13.2V 2 The percentage P-P ripple is typically selected in the 30% to 60% range of the maximum input current. Assuming a 60% P-P inductor-current ripple, the maximum inductor current is given by: IP-P = 1.3IIN The minimum inductor value is given by: 2 MIN MIN IN 18.66V D L 0.6I 300kHz × = × where the switching frequency is 300kHz. The saturation current of the inductor should be higher than IP-P and the minimum value of the inductor at IP-P should exceed LMIN. Output Diode (D1) A Schottky diode must be used as rectifier diode D1 to reduce power dissipation. The voltage rating of diode D1 must be greater than the maximum peak input voltage plus the maximum output voltage. Choose a diode that minimizes dissipation at temperatures in the +90NC to +100NC range. The diode should be selected to minimize reverse leakage at the maximum output voltage while minimizing forward losses when the diode is conducting. Package Information For the latest package outline information and land patterns (foot- prints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 10 TDFN-EP T1033+1 21-0137 90-0003 MAX16840 LED Driver with Integrated MOSFET for MR16 and Other 12V AC Input Lamps www.maximintegrated.com MaximIntegrated│ 11 |
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