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參數資料
| 型號： | SC4525A |
| 廠商： | Semtech Corporation |
| 英文描述： | 28V 3A Step-Down Switching Regulator |
| 中文描述： | 28V的第3A降壓型開關穩壓器 |
| 文件頁數： | 1/19頁 |
| 文件大小： | 722K |
| 代理商： | SC4525A |
POWER MANAGEMENT
Features
November 8, 2007
1MHz 10V-28V to 5V/3A Step-Down Converter (Front Page Schematic)
28V 3A Step-Down Switching Regulator
SC4525A
Typical Application Circuit
Wide input range: 8V to 28V
3A Output Current
200kHz to 2MHz Programmable Frequency
Precision V Feedback Voltage
Peak Current-Mode Control
Cycle-by-Cycle Current Limiting
Hiccup Overload Protection with Frequency Foldback
Soft-Start and Enable
Thermal Shutdown
Thermally Enhanced 8-pin SOIC Package
Fully RoHS and WEEE compliant
Applications
XDSL and Cable Modems
Set Top Boxes
Point of Load Applications
CPE Equipment
DSP Power Supplies
LCD and Plasma TVs
Description
The SC4525A is a constant frequency peak current-mode
step-down switching regulator capable of producing 3A
output current from an input ranging from 8V to 28V. The
switching frequency of the SC4525A is programmable
up to 2MHz, allowing the use of small inductors and
ceramic capacitors for miniaturization, and high input/
output conversion ratio. The SC4525A is suitable for
next generation XDSL modems, high-definition TVs and
various point of load applications.
Peak current-mode PWM control employed in the
SC4525A achieves fast transient response with simple loop
compensation. Cycle-by-cycle current limiting and hiccup
overload protection reduces power dissipation during
output overload. Soft-start function reduces input start-
up current and prevents the output from overshooting
during power-up.
The SC4525A is available in SOIC-8 EDP package.
Figure 1. 1MHz 10V -28V to 5V/3A Step-down Converter
Efficiency of the 1MHz 10V-28V to 5V/3A Step-Down Converter (Front Page)
Efficiency
40
50
60
70
80
90
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Load Current (A)
E
V
IN
= 24V
SC4525A
V
IN
= 12V
SC4525A
GND
IN
SW
BST
L1
5.2
m
H
C1
0.1
m
F
SS/EN
COMP
FB
D2
20BQ030
8.25k
R6
33.2k
10nF
C8
10pF
C5
1nF
L1: Coiltronics CD1-5R2
OUT
5V/3A
D1
1N4148
10V – 28V
ROSC
C2: Murata GRM31CR60J106K
C4: Murata GRM32ER71H475K
C4
4.7
m
F
VIN
C2
10
m
FX3
C7
R4
18.2k
R5
24.3k
R7
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SC4525AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:28V 3A Step-Down Switching Regulator |
| SC4525ASETRT | 功能描述:IC REG BUCK 3A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關:52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| SC4525C | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:28V 3A Step-Down Switching Regulator Thermal Shutdown |
| SC4525CSETRT | 功能描述:IC REG BUCK ADJ 3A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| SC4525D | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:18V, 3A, 350kHz Step-Down Switching Regulator |
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