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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
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Fabricant  MARKTECH [Marktech Corporate]
Site Internet  http://www.marktechopto.com
Logo MARKTECH - Marktech Corporate

TB62731FUG Fiches technique(HTML) 9 Page - Marktech Corporate

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TB62731FUG
2004-09-14
9
Selection of R_sens
Resistance between pin K and GND R_sens (Ω) is used for setting output current Io. The mean output current Io
can 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 Io
may 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 4
Resistance 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)
0
10 9.1 8.2 6.8 5.6 4.7
3.3 2.7 2.2 2 1.8 1.5
1.2
1
10
20
30
40
: Io (mA)


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