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TB62732FU Fiches technique(PDF) 5 Page - Toshiba Semiconductor

No de pièce TB62732FU
Description  The step up type DC-DC converter only for white LED driver lighting
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Fabricant  TOSHIBA [Toshiba Semiconductor]
Site Internet  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TB62732FU Fiches technique(HTML) 5 Page - Toshiba Semiconductor

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TOSHIBA
T B 6 2 7 3 2 F U
27, Feb 2002 (Ver.04)
BASIC OPERATION
The step up type DC/DC converter is applied, and the basic circuit of the TB62732FU adopts peak control of
the current pulse.
The internal MOS transistor NMOS is turned on in the fixed frequency fOSC =1MHz, and the charge has the
energy in the inductance.
Inductance electric current IL turns off NMOS when it reaches 80% of 1/1MHz when it
increased from IL = 0 and it reached IL = ILpeak = 380 (mA, typ).
The shot key diode is turned on, and IL = Ic2 flows, because the coil may keep IL = ILpeak.
After that, Ic2 is decrease, and become IL = 0.
This operation is repeated, and Ic2 is fully done as to the charge, and it becomes Io, and flows to LED.
The details of a basic pulse to use for the current control are shown in Fig 3.
5
T = 1/fOSC, fOSC = 1MHz(typ)
Muximum duty 80 %
ILpeak=
380(mA, max)
When fitness inductance
IL = IL peak
When Un-fitness inductance
Fig 3 : the switching wave form of the inductance
Fig 2 : the application circuit (example)
K
A
GND
0 - 0.12V
OSC
Buffer
R
SQ
REF
A
0.35
i(sub)
i(add)
1.0 MHz
R_sens
IL, ILpeak
Io
Ic2
NMOS
C2
6.8 uH
Vcc
C1
SHDN
Vin
STB
IL becomes 0 in the time.
IL doesn't become 0 in the time.


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