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| 型号： | LM22674MR-ADJ/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.5A 8PSOP |
| 产品培训模块： | SIMPLE SWITCHER® Regulators LM315x & LM2267x SIMPLE SWITCHER® and WEBENCH |
| 标准包装： | 95 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1.285V |
| 输入电压： | 4.5 V ~ 42 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 500mA |
| 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： | 管件 |
| 供应商设备封装： | 8-PSOP-EP |
| 配用： | 551600236-001-ND - WEBENCH BUILD IT LM2267X 8-PSOP |
| 其它名称： | LM22674MR-ADJ LM22674MR-ADJ-ND |
SNVS590L – SEPTEMBER 2008 – REVISED APRIL 2013
(9)
The Q factor depends on the parasitic resistance of the power stage components and is not typically in the
control of the designer. Of course, loop compensation is only one consideration when selecting power stage
components; see the Application Information section for more details.
40
35
30
25
20
15
10
5
0
-ADJ
-5.0
100
1k
10k 100k 1M
10M
FREQUENCY (Hz)
Figure 14. 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 15 shows an example of converting an input voltage range of 5.5V to 42V, to an output of 3.3v at 0.5A.
See the application note for the LM22671, AN-1895 ( SNVA368 ), for more information.
R FBB
VIN 4.5V to 42V
976 :
VIN
BOOT
C2
22 P F
+
C1
2.2 P F
EN
FB
LM22674-ADJ
EN
SW
GND
C3
10 nF
L1
39 P H
R FBT
1.54 k :
VOUT 3.3V
D1
C4
+
GND
60V, 1A
22 P F
GND
Figure 15. Typical Buck Regulator Application
EXTERNAL COMPONENTS
The following guidelines should be used when designing a step-down (buck) converter with the LM22674.
10
Product Folder Links: LM22674
Copyright ? 2008–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM22674MRE-5.0 | 制造商:Texas Instruments 功能描述:SIMPLESWITCH 5.0V 4.5~42VIN 8PSOP 制造商:Texas Instruments 功能描述:SIMPLESWITCH, 5.0V 4.5~42VIN, 8PSOP 制造商:Texas Instruments 功能描述:SIMPLESWITCH, 5.0V 4.5~42VIN, 8PSOP, Primary Input Voltage:12V, No. of Outputs:1 |
| LM22674MRE-5.0/NOPB | 功能描述:直流/直流开关转换器 500MA,STEP-DOWN VLTG REG 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 |
| LM22674MRE-5.0/NOPB | 制造商:Texas Instruments 功能描述:Switching Regulator IC |
| LM22674MRE-ADJ | 制造商:Texas Instruments 功能描述:SIMPLESWITCH 0.5A 4.5~42VIN 8PSOP 制造商:Texas Instruments 功能描述:SIMPLESWITCH, 0.5A 4.5~42VIN, 8PSOP |
| LM22674MRE-ADJ/NOPB | 功能描述:直流/直流开关转换器 500MA,STEP-DOWN VLTG REG 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 |
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