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參數(shù)資料
| 型號： | TB62732FU |
| 廠商： | Toshiba Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | The step up type DC-DC converter only for white LED driver lighting |
| 中文描述： | 唯一的白光LED驅(qū)動器照明加強型DC - DC轉(zhuǎn)換 |
| 文件頁數(shù)： | 5/15頁 |
| 文件大?。?/td> | 177K |
| 代理商： | TB62732FU |
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 becomes 0 in the time.
IL = IL peak
When Un-fitness inductance
IL doesn't become 0 in the time.
Fig 3 : the switching wave form of the inductance
Fig 2 : the application circuit (example)
K
A
GND
0 - 0.12V
OSC
Buffer
R
S
Q
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
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TB62732FUG | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Step-up DC/DC Converter for White LED Driver |
| TB62733FTG | 制造商:TOSHIBA 制造商全稱: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: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:Marktech Corporate 功能描述:Step-up Type DC-DC Converter for White LEDs |
| TB62736FUG(O,EL) | 功能描述:LED照明驅(qū)動器 White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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