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參數(shù)資料
| 型號(hào)： | TB62731FUG |
| 廠商： | Toshiba Corporation |
| 元件分類(lèi)： | LED驅(qū)動(dòng)器 |
| 英文描述： | Step-up DC-DC Converter for White LED Driver |
| 中文描述： | 升壓型DC - DC轉(zhuǎn)換器，用于白光LED驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 5/20頁(yè) |
| 文件大?。?/td> | 250K |
| 代理商： | TB62731FUG |
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TB62731FUG
2006-06-14
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 f
OSC
=
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 f
OSC
(
=
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 I
o
, which flows to the
LED.
The graph below shows details of the basic pulse used for burst control.
Figure 2 Switching Waveform of Inductance
I
=
IL, ILpeak
OSC
With low inductance
With high inductance
T
=
1/f
OSC
, f
OSC
=
350 kHz (typ.)
V
IN
OSC
S R
Buffer
350 kHz
STB
0
A
REF
i (add)
i (sub)
A
K
GND
R_sens
0
V
CC
C1
NMOS
IL, ILpeak
Ic2
C2
I
o
SHDN
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| TB62732FU | 制造商:TOSHIBA 制造商全稱(chēng):Toshiba Semiconductor 功能描述:The step up type DC-DC converter only for white LED driver lighting |
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| TB62733FTG | 制造商:TOSHIBA 制造商全稱(chēng):Toshiba Semiconductor 功能描述:Charge Pump type DC/DC Converter for White LED Driver |
| TB62734FMG | 制造商:MARKTECH 制造商全稱(chēng):Marktech Corporate 功能描述:Step Up Type DC-DC Converter for White LED |
| TB62736FUG | 制造商:MARKTECH 制造商全稱(chēng):Marktech Corporate 功能描述:Step-up Type DC-DC Converter for White LEDs |
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