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參數(shù)資料
| 型號： | EL7641AILTZ-T7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD DC/DC with Integrated Amplifiers |
| 中文描述： | 0.15 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, MO-220, QFN-32 |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 458K |
| 代理商： | EL7641AILTZ-T7 |
15
FN6270.0
May 15, 2006
VOFF supplies. It can be appreciated that should a regular
supply of LX switching edges be interrupted, for example
during discontinuous operation at light boost load currents,
then this may affect the performance of VON and VOFF
regulation – depending on their exact loading conditions at
the time.
To optimize VON/VOFF regulation, the boundary of
discontinuous/continuous operation of the boost converter
can be adjusted, by suitable choice of inductor given VIN,
VOUT, switching frequency and the VBOOST current loading,
to be in continuous operation.
The following equation gives the boundary between
discontinuous and continuous boost operation. For
continuous operation (LX switching every clock cycle) we
require that:
I(VBOOST_load) > D*(1-D)*VIN/(2*L*FOSC)
where the duty cycle, D = (VBOOST – VIN)/VBOOST
For example, with VIN = 5V, FOSC = 1.2MHz and VBOOST =
12V we find continuous operation of the boost converter can
be guaranteed for:
L = 10H and I(VBOOST) > 51mA
L = 6.8H and I(VBOOST) > 74mA
L = 3.3H and I(VBOOST) > 153mA
Start-up Sequence
Figure 23 shows a detailed start-up sequence waveform. For
a successful power-up, there should be 6 peaks at VCDEL.
When a fault is detected, the device will latch off until either
EN is toggled or the input supply is recycled.
When the input voltage is higher than 2.4V, an internal
current source starts to charge CCDEL. During the initial slow
ramp, the device checks whether there is a fault condition. If
no fault is found during the initial ramp, CCDEL is discharged
after the first peak. VREF turns on at the peak of the first
ramp.
Initially the boost is not enabled so VBOOST rises to VIN-
VDIODE through the output diode. Hence, there is a step at
VBOOST during this part of the start-up sequence.
VBOOST soft-starts at the beginning of the third ramp, and is
checked at the end of this ramp. The soft-start ramp
depends on the value of the CDEL capacitor. For CDEL of
100nF, the soft-start time is ~7ms.
VOFF turns on at the start of the fourth peak.
VON is enabled at the beginning of the sixth ramp. VOFF and
VON are checked at end of this ramp.
EL7640A, EL7641A, EL7642A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7641ILTZ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7641ILTZ-T13 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7641ILTZ-T7 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7642 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD DC/DC with Integrated Amplifiers |
| EL7642AILTZ | 功能描述:LCD 驅(qū)動器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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