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參數(shù)資料
| 型號： | LM27241MTC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronous Buck Regulator Controller for Mobile Systems |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 21/27頁 |
| 文件大小： | 1336K |
| 代理商： | LM27241MTC |
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Application Information
(Continued)
F
Z1
<
F
Z2
and F
Z1
<
F
P-COMPLEX
DESIGN EXAMPLE
V
IN
= 15V
V
OUT
= 1.5V
F
BW
= 300kHz
BW = = 30kHz
L
OUT
= 2.2μH
L
OUT
= 2x100μF Tantalum + 2x47μF Ceramic
R
ESR
Tantalum = 100m
R
ESR
Ceramic = 15m
C
OUT
total = 294μF
R
ESR
total = 13m
Notice that F-zero due to the R
is greater than the
cross-over frequency (F
SW
). TYPE III Compensation is re-
quired.
Φ
MAX
45
Pick C
2
to be 4700pF, and calculate R
2
. C
2
= 4700 pF, & R
2
=
5.6 k
C
1
= 190p F (use 220pF).
C
3
sets F
BW
:
R
3
= 1k
R
1
= 5k
Set output voltage:
R
4
= 3.32k
EVALUATION BOARD DETAILS
The Bill of Materials (BOM) is now provided for the LM27241
evaluation board. The schematic is the typical application
circuit. See
Layout Guidelines
for more guidance on pre-
ferred layout practices and also refer to Application Note
AN-1229. Note that a dual FET pack has been chosen for
the evaluation board.
The evaluation board has its output set to 1.5V. The rated
load 6A continuous, and 7A peak. A minimum load of 0.1mA
should be maintained on each output in SKIP mode, to
ensure regulation.
L
www.national.com
21
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM27241MTC/NOPB | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LM27241MTCX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Synchronous Buck Regulator Controller for Mobile Systems |
| LM27241MTCX/NOPB | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| LM27243A E WAF | 制造商:Texas Instruments 功能描述: |
| LM2724A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Speed 3A Synchronous MOSFET Driver |
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