參數(shù)資料
型號(hào)： LM5000-3MTCXEP
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： High Voltage Switch Mode Regulator
中文描述： 2.7 A SWITCHING REGULATOR, 840 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 10/18頁(yè)
文件大小： 438K
代理商： LM5000-3MTCXEP
Block Diagram
20098303
Boost Regulator Operation
The LM5000EP 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 decrease with smaller. This voltage is compared
with the summation of the SW volatge and the ramp com-
pensation.The ramp compensation is used in PWM architec-
tures to eliminate the sub-harmonic oscillations that occur
during duty cycles greater than 50%. Once the summation of
the ramp compensation 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 LM5000EP 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 temperature reaches excessive levels. The UVP
comparator protects 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 prevent the output voltage from rising at no loads
allowing full PWM operation over all load conditions. The
LM5000EP 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
10μA current source.
The LM5000EP is available in two operating frequency
ranges. The LM5000-3EP is pin selectable for either 300kHz
(FS Grounded) or 700kHz (FS Open). The LM5000-6EP is
pin selectable for either 600kHz (FS Grounded) or 1.3MHz
(FS Open)
L
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(kāi)發(fā)工具 LM5000 EVAL UNIT RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)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(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)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?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):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(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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(fēng)格:SMD/SMT
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