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參數(shù)資料
| 型號： | LM5005MH |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Voltage 2.5 Amp Buck Regulator |
| 中文描述： | 4.25 A SWITCHING REGULATOR, 525 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大小： | 774K |
| 代理商： | LM5005MH |
Oscillator and Sync Capability
(Continued)
Error Amplifier and PWM
Comparator
The internal high gain error amplifier generates an error
signal proportional to the difference between the regulated
output voltage and an internal precision reference (1.225V).
The output of the error amplifier is connected to the COMP
pin allowing the user to provide loop compensation compo-
nents, generally a type II network, as illustrated in Figure 1.
This network creates a pole at unity frequency, a zero and a
noise reducing high frequency pole. The PWM comparator
compares the emulated current sense signal from the RAMP
generator to the error amplifier output voltage at the COMP
pin.
RAMP Generator
The ramp signal used in the pulse width modulator for cur-
rent mode control is typically derived directly from the buck
switch current. This switch current corresponds to the posi-
tive slope portion of the output inductor current. Using this
signal for the PWM ramp simplifies the control loop transfer
function to a single pole response and provides inherent
input voltage feed-forward compensation. The disadvantage
of using the buck switch current signal for PWM control is the
large leading edge spike due to circuit parasitics that must
be filtered or blanked. Also, the current measurement may
introduce significant propagation delays. The filtering, blank-
ing time and propagation delay limit the minimum achievable
pulsewidth. In applications where the input voltage may be
relatively large in comparison to the output voltage, control-
ling small pulsewidths and duty cycles is necessary for regu-
lation. The LM5005 utilizes a unique ramp generator, which
does not actually measure the buck switch current but rather
reconstructs the signal. Reconstructing or emulating the in-
ductor current provides a ramp signal to the PWM compara-
tor that is free of leading edge spike and measurement or
filtering delays. The current reconstruction is comprised of
two elements; a sample & hold DC level and an emulated
current ramp.
20161907
FIGURE 5. Simplified Oscillator Block Diagram and SYNC I/O Circuit
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 |
|---|---|
| LM5005MH/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2.5A Integrated Buck Regulator 75V RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM5005MHX | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM5005MHX/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM5006 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Evaluation Board provides the design engineer with a fully functional |
| LM5006EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM5006 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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