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參數資料
| 型號： | LM5000-3MTCX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.7 A SWITCHING REGULATOR, 840 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數： | 18/18頁 |
| 文件大?。?/td> | 388K |
| 代理商： | LM5000-3MTCX/NOPB |
Block Diagram
20031903
Boost Regulator Operation
The LM5000 utilizes a PWM control scheme to regulate the
output voltage over all load conditions. The operation can best
be understood referring to the block diagram and Figure 3. At
the start of each cycle, the oscillator sets the driver logic and
turns on the NMOS power device conducting current through
the inductor, cycle 1 of Figure 3 (a). During this cycle, the
voltage at the COMP pin controls the peak inductor current.
The COMP voltage will increase with larger loads and de-
crease with smaller. This voltage is compared with the sum-
mation of the SW volatge and the ramp compensation.The
ramp compensation is used in PWM architectures to eliminate
the sub-harmonic oscillations that occur during duty cycles
greater than 50%. Once the summation of the ramp compen-
sation and switch voltage equals the COMP voltage, the PWM
comparator resets the driver logic turning off the NMOS power
device. The inductor current then flows through the output
diode to the load and output capacitor, cycle 2 of Figure 3 (b).
The NMOS power device is then set by the oscillator at the
end of the period and current flows through the inductor once
again.
The LM5000 has dedicated protection circuitry running during
the normal operation to protect the IC. The Thermal Shutdown
circuitry turns off the NMOS power device when the die tem-
perature reaches excessive levels. The UVP comparator pro-
tects the NMOS power device during supply power startup
and shutdown to prevent operation at voltages less than the
minimum input voltage. The OVP comparator is used to pre-
vent the output voltage from rising at no loads allowing full
PWM operation over all load conditions. The LM5000 also
features a shutdown mode. An external capacitor sets the
softstart time by limiting the error amp output range, as the
capacitor charges up via an internal 10A current source.
The LM5000 is available in two operating frequency ranges.
The LM5000-3 is pin selectable for either 300kHz (FS
Grounded) or 700kHz (FS Open). The LM5000-6 is pin se-
lectable for either 600kHz (FS Grounded) or 1.3MHz (FS
Open)
9
www.national.com
LM5000
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| LM5000-3MYC | 制造商:Texas Instruments 功能描述: |
| LM5000EP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Enhanced Plastic High Voltage Switch Mode Regulator |
| LM5000EVAL | 功能描述:電源管理IC開發(fā)工具 LM5000 EVAL UNIT RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM5000EVAL/NOPB | 功能描述:EVALUATION BOARD FOR LM5000 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM5000SD-3 | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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