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參數(shù)資料
| 型號： | LM2622MM-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 600kHz/1.3MHz Step-up PWM DC/DC Converter |
| 中文描述： | 2.3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 429K |
| 代理商： | LM2622MM-ADJ |
Application Information
Triple Output TFT Bias
The circuit in Figure 3 shows how the LM2622 can be
configured to provide outputs of 8V, 8V, and 23V, conve-
nient for biasing TFT displays. The 8V output is regulated,
while the 8V and 23V outputs are unregulated.
The 8V output is generated by a typical boost topology. The
basic operation of the boost converter is described in the
OPERATION section. The output voltage is set with R
FB1
and R
FB2
by:
C
is placed across R
to act as a pseudo soft-start. The
compensation network of R
and C
are chosen to optimally
stabilize the converter. The inductor also affects the stability.
When operating at 600 kHz, a 10uH inductor is recom-
mended to insure the converter is stable at duty cycles
greater than 50%. Refer to the COMPENSATION section for
more information.
The -8V output is derived from a diode inverter. During the
second cycle, when the transistor is open, D2 conducts and
C1 charges to 8V minus a diode drop (
)
0.4V if using a
Schottky). When the transistor opens in the first cycle, D3
conducts and C1’s polarity is reversed with respect to the
output at C2, producing -8V.
The 23V output is realized with a series of capacitor charge
pumps. It consists of four stages: the first stage includes C4,
D4, and the LM2622 switch; the second stage uses C5, D5,
and D1; the third stage includes C6, D6, and the LM2622
switch; the final stage is C7 and D7. In the first stage, C4
charges to 8V when the LM2622 switch is closed, which
causes D5 to conduct when the switch is open. In the second
stage, the voltage across C5 is VC4 + VD1 - VD5 = VC4
)
8V when the switch is open. However, because C5 is refer-
enced to the 8V output, the voltage at C5 is 16V when
referenced to ground. In the third stage, the 16V at C5
10127308
FIGURE 3. Triple Output TFT Bias (600 kHz operation)
L
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2622MM-ADJ/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM2622MMX-ADJ | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Up 2V to 12V 8-Pin MSOP T/R |
| LM2622MMX-ADJ/NOPB | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| LM2623 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM2623_04 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:General Purpose, Gated Oscillator Based, DC/DC Boost Converter |
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