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| 型号： | LM22673MRX-5.0/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 11/27页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 3A 8PSOP |
| 产品培训模块： | SIMPLE SWITCHER® Regulators LM315x & LM2267x SIMPLE SWITCHER® and WEBENCH |
| 标准包装： | 2,500 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.5 V ~ 42 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-PSOP-EP |
| 配用： | 551600236-001-ND - WEBENCH BUILD IT LM2267X 8-PSOP LM22673EVAL/NOPB-ND - BOARD EVALUATION FOR LM22673 |
| 其它名称： | LM22673MRX-5.0 |
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5
0
-ADJ
-5.0
SNVS586N – SEPTEMBER 2008 – REVISED APRIL 2013
100
1k
10k 100k 1M
10M
FREQUENCY (Hz)
Figure 15. Compensator Gain
In general, hand calculations or simulations can only aid in selecting good power stage components. Good
design practice dictates that load and line transient testing should be done to verify the stability of the application.
Also, Bode plot measurements should be made to determine stability margins. Application note AN-1889
SNVA364 shows how to perform a loop transfer function measurement with only an oscilloscope and function
generator.
Application Information
TYPICAL BUCK REGULATOR APPLICATION
Figure 16 shows an example of converting an input voltage range of 5.5V to 42V, to an output of 3.3v at 3A. See
AN-1894 ( SNVA367 ) for more information.
R FBB
VIN 4.5V to 42V
976 :
VIN
C2
22 P F
+
C1
6.8 P F
C6
1 P F
SS BOOT
FB
LM22673-ADJ
IADJ SW
GND
C3
10 nF
L1
8.2 P H
R FBT
1.54 k :
VOUT 3.3V
GND
R3
D1
60V, 5A
C4
120 P F
+
GND
Figure 16. Typical Buck Regulator Application
EXTERNAL COMPONENTS
The following guidelines should be used when designing a step-down (buck) converter with the LM22673.
INDUCTOR
The inductor value is determined based on the load current, ripple current, and the minimum and maximum input
voltages. To keep the application in continuous conduction mode (CCM), the maximum ripple current, I RIPPLE ,
should be less than twice the minimum load current.
The general rule of keeping the inductor current peak-to-peak ripple around 30% of the nominal output current is
a good compromise between excessive output voltage ripple and excessive component size and cost. Using this
value of ripple current, the value of inductor, L, is calculated using the following formula:
Copyright ? 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM22673
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM22673MRX-ADJ | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Inv/Step Down 4.5V to 42V 8-Pin PSOP EP T/R |
| LM22673MRX-ADJ/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM22673QMR-5.0/NOPB | 制造商:Texas Instruments 功能描述:IC REG BUCK 5V 3A 8SOPWRPAD 制造商:Texas Instruments 功能描述:42V, 3A SIMPLE SWITCHER Step-Down Volta |
| LM22673QMR-ADJ/NOPB | 制造商:Texas Instruments 功能描述:IC REG BUCK ADJ 3A 8SOPWRPAD |
| LM22673QMRE-5.0/NOPB | 制造商:Texas Instruments 功能描述:IC REG BUCK 5V 3A 8SOPWRPAD 制造商:Texas Instruments 功能描述:42V, 3A SIMPLE SWITCHER Step-Down Volta |
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