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参数资料
| 型号： | LM2576-12WT |
| 厂商： | Micrel Inc |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 12V 3A TO220-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 12V |
| 输入电压： | 4 V ~ 40 V |
| 频率 - 开关： | 42kHz ~ 63kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-5 |
LM2576
Test Circuits and Layout Guidelines
FEEDBACK
Micrel, Inc.
+V IN
1
LM2575
4
OUTPUT
L1
V OUT
5.00V
C IN — 100μF, 75V Aluminum Electrolytic
C OUT — 470μF, 15V Aluminum Electrolytic
7V - 40V
UNREGULATED
DC INPUT
+
100 μF
C IN
GND 3
ON/OFF 5
2
330 μH
D1
MBR360
+
C OUT
470μF
R2
R1
L
O
A
D
D1 — Schottky, MBR360
L1 — 330μH, 415-0926 (AIE)
R1 — 1k, 0.01%
R2 — 3.065k, 0.01%
5-pin TO-220 socket — 2936 (Loranger Mfg. Co.)
4-pin TO-3 socket — 8112-AG7 (Augat Inc.)
FEEDBACK
+V IN
1
LM2575-5.0
4
OUTPUT
L1
V OUT
5.00V
C IN — 100μF, 75V Aluminum Electrolytic
C OUT — 330μF, 15V Aluminum Electrolytic
7V - 40V
UNREGULATED
DC INPUT
+
100 μF
C IN
GND 3
ON/OFF 5
2
330 μH
D1
11DQ06
+
C OUT
220μF
L
O
A
D
D1 — Schottky, 11DQ06
L1 — 100μH, 415-0926 (AIE)
5-pin TO-220 socket — 2936 (Loranger Mfg. Co.)
4-pin TO-3 socket — 8112-AG7 (Augat Inc.)
Note : Pin numbers are for TO-220 Package
Figure 1.
As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance generate voltage transients
which can cause problems. For minimal stray inductance and ground loops, the length of the leads indicated by heavy lines should be kept as
short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results.
Block Diagrams
V IN
1
INTERNAL
REGULATOR
ON/OFF
5
ON/OFF
V IN
1
INTERNAL
REGULATOR
ON/OFF
5
ON/OFF
FEED-
BACK
4
3.1k
FIXED GAIN
ERROR AMP
FIXED GAIN
ERROR AMP
1.0k
+
-
+
-
COMPARATOR
DRIVER
3 AMP
SWITCH
FEED-
BACK
4
+
-
+
-
COMPARATOR
DRIVER
3 AMP
SWITCH
1.23V
2
OUTPUT
1.23V
2
OUTPUT
BAND-GAP
REFERENCE
52 kHz
OSCILLATOR
RESET
THERMAL
SHUTDOWN
CURRENT
LIMIT
3
GND
BAND-GAP
REFERENCE
52 kHz
OSCILLATOR
RESET
THERMAL
SHUTDOWN
CURRENT
LIMIT
3
GND
Note: Pin numbers are for the TO-220 package
Fixed Regulator
Adjustable Regulator
M9999-082605-B
8
August 2005
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| LM2576-12WU | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2576-12WU TR | 功能描述:直流/直流开关调节器 3A Step-Down SMPS Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2576-15 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Easy Switcher 3.0A Step-Down Voltage Regulator |
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| LM2576-15BU | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller |
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