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參數(shù)資料
| 型號： | LM2576BUT&R |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封裝： | TO-263, 5 PIN |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 57K |
| 代理商： | LM2576BUT&R |
August 2005
1
M9999-082605-B
LM2576
Micrel, Inc.
LM2576
52kHz Simple 3A Buck Regulator
General Description
The LM2576 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, or 12V
fixed output. Adjustable versions have an output voltage
range from 1.23V to 37V. Both versions are capable of driving
a 3A 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 LM2576 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 LM2576 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
A standby current. The output switch includes cycle-by-
cycle current limiting and thermal shutdown for full protection
under fault conditions.
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 3A 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 < 200A
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
+
CIN
100F
+VIN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330H
+
D1
1N5822
COUT
330F
R2 3.09k
R1 1k
VOUT = 1.23 1 +
(
)
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
7V–40V
Unregulated
DC Input
LM2575-5.0
+
CIN
100F
+VIN
1
3
Gnd
5
On/Off
2
Output
4
Feedback
L1
330H
+
D1
1N5822
COUT
330F
+5V, 1A
Regulated
Output
Note: Pin numbers are for TO-220 Package
Fixed Regulator in Typical Application
Adjustable Regulator in Fixed Output Application
Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2576D2T-005 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5V 3A Buck PWM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2576D2T-005G | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5V 3A Buck PWM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2576D2T-012 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 12V 3A Buck PWM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2576D2T-012G | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 12V 3A Buck PWM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2576D2T-015 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 15V 3A Buck PWM RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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