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參數(shù)資料
| 型號： | LM20242 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| 中文描述： | 至36V，2A條的PowerWise㈢可調頻率同步降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 384K |
| 代理商： | LM20242 |
LM20242 tri-states the power FETs and resets soft-start. After
the junction cools to approximately 150°C, the part starts up
using the normal start up routine. This feature is provided to
prevent catastrophic failures from accidental device over-
heating.
LIGHT LOAD OPERATION
The LM20242 offers increased efficiency when operating at
light loads. Whenever the load current is reduced to a point
where the peak to peak inductor ripple current is greater than
two times the load current, the part will enter the diode emu-
lation mode preventing significant negative inductor current.
The point at which this occurs is the critical conduction bound-
ary and can be calculated by the following equation:
Several diagrams are shown in
Figure 1
illustrating continu-
ous conduction mode (CCM), discontinuous conduction
mode, and the boundary condition.
It can be seen that in diode emulation mode, whenever the
inductor current reaches zero the SW node will become high
impedance. Ringing will occur on this pin as a result of the LC
tank circuit formed by the inductor and the parasitic capaci-
tance. If this ringing is of concern, an additional RC snubber
circuit can be added from the switch node to ground.
At very light loads, usually below 100 mA, several pulses may
be skipped in between switching cycles, effectively reducing
the switching frequency and further improving light-load effi-
ciency.
30031464
FIGURE 1. Modes of Operation for LM20242
www.national.com
10
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM20242_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| LM20242EVAL | 功能描述:BOARD EVAL 2A POWERWISE LM20242 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 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 |
| LM20242EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM20242 EVAL BOARD 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 |
| LM20242MH | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 36V 20-Pin TSSOP EP Rail 制造商:Texas Instruments 功能描述:SWITCH REG, 36V, 2A, TSSOP20, POWERWISE 制造商:Texas Instruments 功能描述:SWITCH REG, 36V, 2A, TSSOP20, POWERWISE; Primary Input Voltage:36V; No. of Outputs:1; Output Voltage:32V; Output Current:2A; Voltage Regulator Case Style:TSSOP; No. of Pins:20; Operating Temperature Min:-40C; Operating Temperature ;RoHS Compliant: Yes |
| LM20242MH/NOPB | 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(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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