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TB62731FUG Fiches technique(PDF) 5 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) 5 Page - Marktech Corporate

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TB62731FUG
2004-09-14
5
Figure 1
Application Circuit
The basic TB62731FUG circuit uses a step-up DC-DC converter and burst control of the current pulse.
Basic Operation
The internal MOS transistor (NMOS) is turned on at fOSC = 350 kHz, charging energy to the inductor.
The inductance current IL increases from 0. When IL = ILpeak = 240 mA (typ.) or when 5/6 (83.3%) of fOSC (=
350 kHz) is reached, the transistor is turned off.
At that time, the coil maintains IL = ILpeak, the Schottky diode is turned on, and IL = Ic2 flows. Then, Ic2
decreases, reaching IL = 0.
The above operation repeats. When Ic2 is fully charged, the surplus current becomes Io, which flows to the
LED.
The graph below shows details of the basic pulse used for burst control.
Figure 2
Switching Waveform of Inductance
IL, ILpeak
Maximum duty: 83.3% of fOSC
With low inductance
With high inductance
T
= 1/fOSC, fOSC = 350 kHz (typ.)
VIN
OSC
S
Q
R
Buffer
350 kHz
STB
A
REF
i (add)
i (sub)
A
K
GND
R_sens
VCC
C1
NMOS
IL, ILpeak
Ic2
C2
Io
SHDN


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