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## TB62731FUG Fiches technique(PDF) 9 Page - Marktech Corporate

 No de pièce TB62731FUG Description Step-up DC-DC Converter for White LED Driver Download 17 Pages Scroll/Zoom 100% Fabricant MARKTECH [Marktech Corporate] Site Internet http://www.marktechopto.com Logo

## TB62731FUG Fiches technique(HTML) 9 Page - Marktech Corporate

 9 / 17 pageTB62731FUG2004-09-149Selection of R_sensResistance between pin K and GND R_sens (Ω) is used for setting output current Io. The mean output current Iocan be set according to the resistance.The mean current Io (mA) to be set is roughly calculated as follows:Io (mA) = 36 (mV) ÷ R_sens (Ω)For example, when R_sens = 1.8 (Ω), Io = 20 (mA).Take a current error of ±10% (not including R_sens error) into consideration.The IC has a minimum output Po = 320 (mA, choke coil = 47 µH).At that time, if the product of mean current Io and output voltage Vo exceeds Po = 320 (mW), mean current Iomay become less than the desired value.If the IC is not connected to the output-side capacitor (for smoothing), the set current Io can be obtained.At that time, because the current flowing to the LED is a pulse current with a maximum peak value of 270 mA,make sure that surge current IFP (mA) does not flow to the LED.Toshiba recommend use of components with low reactance (parasitic inductance) and minimized PCB wiring.Toshiba also recommend allocating components in the application circuit diagram as near each other as possible.Figure 4Resistance for setting current R_sens (Ω)Relation between set current IO and setting resistance R_sens(typical value: VCC = 3.6 V, Ta = 25°C)010 9.1 8.2 6.8 5.6 4.73.3 2.7 2.2 2 1.8 1.51.2110203040: Io (mA)

## Numéro de composants électroniques

 No de pièce Description Html View Fabricant TB62732FU The step up type DC-DC converter only for white LED driver lighting 1  2  3  4  5  More Toshiba Semiconductor A8430 White LED Driver Constant Current Step-up Converter 1  2  3  4  5  More Allegro MicroSystems TB62750FTG Step Up Type DC-DC Converter for White LED 1  2  3  4  5  More Marktech Corporate LM3557 Step-Up Converter for White LED Applications 1  2  3  4  5  More National Semiconductor (TI) TB62733FTG Charge Pump type DC/DC Converter for White LED Driver 1  2  3  4  5  More Toshiba Semiconductor TCA62735AFLG Charge Pump type DC/DC Converter for White LED Driver 1  2  3  4  5  More Marktech Corporate MAX1582 High-Efficiency 26V Step-Up Converter for White LED Main and Subdisplay Backlighting 1  2  3  4  5  More Maxim Integrated Products LM3557 Step-Up Converter for White LED Applications 1  2  3  4  5  More National Semiconductor (TI) A8431 White LED Driver Constant Current Step-up Converter 1  2  3  4  5  More Allegro MicroSystems LM3501 Synchronous Step-up DC/DC Converter for White LED Applications 1  2  3  4  5  More National Semiconductor (TI)

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