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參數(shù)資料
| 型號(hào)： | LM2700 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 600kHz/1.25MHz, 2.5A, Step-up PWM DC/DC Converter |
| 中文描述： | 600kHz/1.25MHz，包2.5a，升壓PWM型DC / DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/17頁(yè) |
| 文件大?。?/td> | 478K |
| 代理商： | LM2700 |
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Operation
Continuous Conduction Mode
The LM2700 is a current-mode, PWM boost regulator. A
boost regulator steps the input voltage up to a higher output
voltage. In continuous conduction mode (when the inductor
current never reaches zero at steady state), the boost regu-
lator operates in two cycles.
In the first cycle of operation, shown in Figure 1 (a), the
transistor is closed and the diode is reverse biased. Energy
is collected in the inductor and the load current is supplied by
C
OUT
.
The second cycle is shown in Figure 1 (b). During this cycle,
the transistor is open and the diode is forward biased. The
energy stored in the inductor is transferred to the load and
output capacitor.
The ratio of these two cycles determines the output voltage.
The output voltage is defined approximately as:
where D is the duty cycle of the switch, D and D' will be
required for design calculations.
Setting the Output Voltage
The output voltage is set using the feedback pin and a
resistor divider connected to the output as shown in Figure 3
The feedback pin voltage is 1.26V, so the ratio of the feed-
back resistors sets the output voltage according to the fol-
lowing equation:
Introduction to Compensation
20012302
FIGURE 1. Simplified Boost Converter Diagram
(a) First Cycle of Operation (b) Second Cycle Of Operation
20012305
FIGURE 2. (a) Inductor current. (b) Diode current.
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2700_04 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:600kHz/1.25MHz, 2.5A, Step-up PWM DC/DC Converter |
| LM2700LD-ADJ | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| LM2700LD-ADJ/NOPB | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| LM2700LDX-ADJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:600kHz/1.25MHz, 2.5A, Step-up PWM DC/DC Converter |
| LM2700LDX-ADJ/NOPB | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
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