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TB62731FUG Fiches technique(PDF) 8 Page - Marktech Corporate

No de pièce TB62731FUG
Description  Step-up DC-DC Converter for White LED Driver
Download  17 Pages
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Fabricant  MARKTECH [Marktech Corporate]
Site Internet  http://www.marktechopto.com
Logo MARKTECH - Marktech Corporate

TB62731FUG Fiches technique(HTML) 8 Page - Marktech Corporate

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TB62731FUG
2004-09-14
8
Substitute the following conditions in formula 2.
Supply voltage VIN = 3.0~4.3 (V)
Output-side capacitor C2 = 1 (µF) . . . C2 is ignored in the calculation.
Where it is assumed that,
VfLED = 16 (V), Vf schottky = 0.3 (V), R_sens = 1.8 (Ω), Io = 20 (mA), K = 1.1
VfLED: LED Vf
Vf schottky: schottky diode Vf
R_sens: setting resistance
Io: set current
K: margin
L (µH) = ((1.1 × 16 × 0.02) − 3 × 0.02) × (1/275e3) × 2 × (1/(0.21 × 0.21)) = 48.1 (µH, VIN = 3.0 V)
43.8 (µH, VIN = 4.3 V)
Thus, 48.1 (µH) is selected when the input voltage is low, 3.0 V.
Note that the calculation does not consider fluctuations in inductance. Toshiba recommend selection of an
inductance of 1.2 times the calculated value.
The recommended inductance under the above conditions is L (µH) = 48.1 (µH) × 1.2 >= 57.7 (µH).


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