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參數(shù)資料
| 型號： | LM2743 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | N-Channel FET Synchronous Buck Regulator Controller for Conversion from 3.3V |
| 中文描述： | N溝道場效應(yīng)管同步降壓穩(wěn)壓控制器，用于從3.3V轉(zhuǎn)換 |
| 文件頁數(shù)： | 11/23頁 |
| 文件大小： | 653K |
| 代理商： | LM2743 |
Application Information
(Continued)
V
FB
= V
OUT2
*(R
FB2
/(R
FB1
+R
FB2
))
Since V
SS
= V
FB
=0.6V, then
Tracking Equation
The total value of the track resistor divider (
Figure 3
), R
and
R
, should be set below 10k
for better precision. Let
R4=1K, for V
OUT1
= 5V and V
OUT2
=1.8V, R
3
=136
.
Case 2: Rise together until V
OUT2
=1.8V
V
SS
= V
FB
= 0.6V,
V
OUT1
= V
OUT2
= 1.8V
For R
4
=1k
, R
3
=500
(from Tracking Equation).
The soft start reaches 0.6V at V
OUT1
equal 1.8V.
For V
OUT1
>
1.8V, V
OUT2
stays in regulation at 1.8V.
Case 3: V
OUT2
starts rising 3.0ms after V
OUT1
Assuming V
slew rate SR
VSD
= 1V/ms and voltage
divider ratio 1:3 (R
= 500
and R
= 1k
), the V
slew rate
equals SR
= 0.333V/ms. During the delay time V
raises to 1.0V (V
) as shown in
Figure 8
. The delay time
is calculated from :
t
DELAY
= V
SD-IH
/SR
VSD
t
DELAY
= 1.0(V) / 0.333(V/ms) = 3.0ms
20095208
FIGURE 4. Timing Behavior of Case 1
20095209
FIGURE 5. Block Diagram of Case 2
20095210
FIGURE 6. Timing Behavior of Case 2
20095214
FIGURE 7. Block Diagram of Case 3
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2743-19AEVAL | 功能描述:電源管理IC開發(fā)工具 LM2743 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 |
| LM2743EVAL | 功能描述:BOARD EVALUATION LM2743 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(chǎn)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(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM2743EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM2743 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 |
| LM2743MTC | 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 安裝風格: 封裝 / 箱體:CPAK |
| LM2743MTC/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 安裝風格: 封裝 / 箱體:CPAK |
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