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參數(shù)資料
| 型號(hào)： | LM2575 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 52kHz Simple 1A Buck Regulator(固定頻率為52kHz 輸出電流 1A 可調(diào)轉(zhuǎn)換電壓步降穩(wěn)壓器) |
| 中文描述： | 52kHz簡(jiǎn)單1A降壓穩(wěn)壓器（固定頻率為52kHz輸出電流1A條可調(diào)轉(zhuǎn)換電壓步降穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 1/7頁(yè) |
| 文件大小： | 90K |
| 代理商： | LM2575 |
August 1999
1
M2575
LM2575
Micrel
LM2575
52kHz Simple 1A Buck Regulator
General Description
The LM2575 series of monolithic integrated circuits provide
all the active functions for a step-down (buck) switching
regulator. Fixed versions are available with a 3.3V, 5V, 12V,
fixed output. Adjustable versions have an output voltage
range from 1.23V to 37V. Both versions are capable of driving
a 1A load with excellent line and load regulation.
These regulators are simple to use because they require a
minimum number of external components and include internal
frequency compensation and a fixed-frequency oscillator.
The LM2575 series offers a high efficiency replacement for
popular three-terminal adjustable linear regulators. It
substantially reduces the size of the heat sink, and in many
cases no heat sink is required.
A standard series of inductors available from several different
manufacturers are ideal for use with the LM2575 series. This
feature greatly simplifies the design of switch-mode power
supplies.
The feedback voltage is guaranteed to
±
2% tolerance for
adjustable versions, and the output voltage is guaranteed to
±
3% for fixed versions, within specified input voltages and
output load conditions. The oscillator frequency is guaranteed
to
±
10%. External shutdown is included, featuring less than
200
μ
A standby current. The output switch includes cycle-by-
cycle current limiting and thermal shutdown for full protection
under fault conditions.
870 20
Typical Applications
Features
3.3V, 5V, 12V, and adjustable output versions
Voltage over specified line and load conditions:
Fixed version:
±
3% max. output voltage
Adjustable version:
±
2% max. feedback voltage
Guaranteed 1A output current
Wide input voltage range:
4V to 40V
Wide output voltage range
1.23V to 37V
Requires only 4 external components
52kHz fixed frequency internal oscillator
Low power standby mode I
Q
typically < 200
μ
A
80% efficiency (adjustable version typically > 80%)
Uses readily available standard inductors
Thermal shutdown and current limit protection
100% electrical thermal limit burn-in
Applications
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter (inverting Buck-Boost)
Isolated Flyback Converter using minimum number of
external components
Negative Boost Converter
R2
R1
7V–40V
Unregulated
DC Input
LM2575
+
C
IN
100μF
+V
IN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330μH
+
D1
1N5822
C
OUT
330μF
R2 3.09k
R1 1k
V
OUT
= 1.23 1 +
( )
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
7V–40V
Unregulated
DC Input
LM2575-5.0
+
C
IN
100μF
+V
IN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330μH
+
D1
1N5822
C
OUT
330μF
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
Fixed Regulator in Typical Application
Adjustable Regulator in Fixed Output Application
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2576-12BT⒂ | 52kHz Simple 3A Buck Voltage Regulator |
| LM2576-3.3BU | 52kHz Simple 3A Buck Voltage Regulator |
| LM2576-5.0BT⒂ | 52kHz Simple 3A Buck Voltage Regulator |
| LM2576-5.0BU | 52kHz Simple 3A Buck Voltage Regulator |
| LM2576 | 52kHz Simple 3A Buck Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2575/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Easy Switcher? 1.0 A Step-Down Voltage Regulator |
| LM2575_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.0 A, Adjustable Output Voltage, Step−Down Switching Regulator |
| LM2575_06 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR |
| LM2575_09 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:52kHz Simple 1A Buck Regulator |
| LM2575-05IKC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR |
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