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參數(shù)資料
| 型號： | LM2825 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Integrated Power Supply 1A DC-DC Converter |
| 中文描述： | 第1A集成電源DC - DC變換器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 633K |
| 代理商： | LM2825 |
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 |
|---|---|
| LM285-1.2(中文) | Micropower Voltage References(1.2V基準(zhǔn)電壓源) |
| LM285-1.2D | MICROPOWER VOLTAGE REFERENCES |
| LM285LD-2.5 | Voltage Reference |
| LM385BMX-1.2 | Voltage Reference |
| LM385BSM-1.2 | Voltage Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2825-12 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Integrated Power Supply 1A DC-DC Converter(633.82 k) |
| LM2825-3.3 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Integrated Power Supply 1A DC-DC Converter(633.82 k) |
| LM2825-5.0 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Integrated Power Supply 1A DC-DC Converter(633.82 k) |
| LM2825-ADJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Integrated Power Supply 1A DC-DC Converter(633.82 k) |
| LM2825H-ADJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Integrated Power Supply 1A DC-DC Converter(633.82 k) |
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