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參數(shù)資料
| 型號： | LM2825N-3.3 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Integrated Power Supply 1A DC-DC Converter |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 150 kHz SWITCHING FREQ-MAX, PDIP24 |
| 封裝： | 1.250 X 0.540 INCH, 0.260 INCH HEIGHT, PLASTIC, DIP-24 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 633K |
| 代理商： | LM2825N-3.3 |
Test Circuit
Application Information
PROGRAMMING OUTPUT VOLTAGE
(Selecting R1 and R2 as shown in Figure 3)
The LM2825 is available in two adjustable output versions.
The LM2825-ADJ has been optimized for output voltages
between 1.23V and 8V, while the LM2825H-ADJ covers the
output voltage range of 7V to 15V. Both adjustable versions
are set in the following way.
Select a value for R1 between 240
and 1.5 k
. The lower
resistor values minimize noise pickup at the sensitive adjust
pin. (For lowest temperature coefficient and the best stability
with time, use 1% metal film resistors.)
Select R2 with the following equation.
When programming V
, keep in mind that V
IN
must be
greater than V
OUT
+ 2V for proper operation.
OPTIONAL EXTERNAL COMPONENTS
SOFT-START CAPACITOR
C
:
A capacitor on this pin provides the regulator with a
Soft-start feature (slow start-up). The current drawn from the
source starts out at a low average level with narrow pulses,
and ramps up in a controlled manner as the pulses expand
to their steady-state width. This reduces the startup current
considerably, and delays and slows down the output voltage
rise time.
DS012661-19
*
Optional—Required if package is more than 6" away from main filter or bypass capacitor.
*
*Optional Soft-start Capacitor
V
IN
= 40V (max)
V
OUT
= 3.3V or 5V
@
1A or 12V
@
0.75A
FIGURE 2. Standard Test Circuit
(Fixed Output Voltage Versions)
DS012661-30
*
Optional—Required if package is more than 6" away from main filter or bypass capacitor.
*
*Optional Soft-start Capacitor
***
Optional—See Application Information.
V
IN
= 40V (max)
V
OUT
= 1.23V to 8V (LM2825-ADJ)
7V to 15V (LM2825H-ADJ)
I
LOAD
= I
MAX
(See derating curves)
FIGURE 3. Standard Test Circuit
(Adjustable Output Voltage Versions)
7
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2825N-5.0 | Integrated Power Supply 1A DC-DC Converter |
| LM2825N-ADJ | Integrated Power Supply 1A DC-DC Converter |
| LM2825HN-ADJ | Integrated Power Supply 1A DC-DC Converter |
| LM2825-12 | Integrated Power Supply 1A DC-DC Converter(633.82 k) |
| LM2825-3.3 | Integrated Power Supply 1A DC-DC Converter(633.82 k) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2825N33 | 制造商:Texas Instruments 功能描述:SWITCHING REG 1A 3.3V 2825 DIP24 |
| LM2825N-5.0 | 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(fēng)格: 封裝 / 箱體:CPAK |
| LM2825N-5.0/NOPB | 功能描述:DC/DC 開關(guān)控制器 INTEGR PWR SUPPLY 1A DC-DC CONVERTER 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(fēng)格: 封裝 / 箱體:CPAK |
| LM2825N50 | 制造商:Texas Instruments 功能描述:NATIONAL 24 PIN DIP |
| LM2825N-50 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM2825 Integrated Power Supply 1A DC-DC Converter |
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