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參數(shù)資料
| 型號(hào)： | LM3311SQ-HIOP/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 1280 kHz SWITCHING FREQ-MAX, QCC24 |
| 封裝： | LEAD FREE, LLP-24 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 2504K |
| 代理商： | LM3311SQ-HIOP/NOPB |
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GPM Transient Waveforms
20126398
VGH = 20V, VDPM = 3.3V, C
VGHM = 4.7nF, RE = 2.4k, CE = open, R1 = 13k,
R2 = 1.2k
, VFLK at 50% duty cycle and 30kHz
1) VFLK, 2V/div, DC
3) VGHM, 5V/div, DC
T = 4s/div
GPM Transient Waveforms
20126310
VGH = 20V, VDPM = 3.3V, C
VGHM = 4.7nF, RE = 750, CE = open, R1 = 13k,
R2 = 1.2k
, VFLK at 50% duty cycle and 64kHz
1) VFLK, 2V/div, DC
3) VGHM, 5V/div, DC
T = 2s/div
Operation
20126302
FIGURE 1. Simplified Boost Converter Diagram
(a) First Cycle of Operation (b) Second Cycle Of Operation
CONTINUOUS CONDUCTION MODE
The LM3311 contains 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 tran-
sistor 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 re-
quired for design calculations.
SETTING THE OUTPUT VOLTAGE (BOOST CONVERTER
AND LDO)
The output voltage is set using the feedback pin and a resistor
divider connected to the output as shown in the typical oper-
ating circuit. The feedback pin voltage is 1.263V for both the
17
www.national.com
LM3311
相關(guān)PDF資料 |
PDF描述 |
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| LM3311SQ-HIOP | 2.6 A SWITCHING REGULATOR, 1280 kHz SWITCHING FREQ-MAX, QCC24 |
| LM3354MM-3.7/NOPB | SWITCHED CAPACITOR REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| LM3354MMX-3.3/NOPB | SWITCHED CAPACITOR REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| LM3354MM-5.0/NOPB | SWITCHED CAPACITOR REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3311SQX | 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 |
| LM3311SQX/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 |
| LM3311SQX-HIOP | 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 |
| LM3311SQX-HIOP/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 |
| LM33164D | 制造商:Motorola Inc 功能描述:33164D |
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