欢迎访问ic37.com |
会员登录 免费注册
发布采购

A4447SLJTR-T 参数 Datasheet PDF下载

A4447SLJTR-T图片预览
型号: A4447SLJTR-T
PDF下载: 下载PDF文件 查看货源
内容描述: 降压稳压器的高电压,升压 [High Voltage Step Down Regulator]
分类和应用: 稳压器
文件页数/大小: 9 页 / 320 K
品牌: ALLEGRO [ ALLEGRO MICROSYSTEMS ]
 浏览型号A4447SLJTR-T的Datasheet PDF文件第2页浏览型号A4447SLJTR-T的Datasheet PDF文件第3页浏览型号A4447SLJTR-T的Datasheet PDF文件第4页浏览型号A4447SLJTR-T的Datasheet PDF文件第5页浏览型号A4447SLJTR-T的Datasheet PDF文件第6页浏览型号A4447SLJTR-T的Datasheet PDF文件第7页浏览型号A4447SLJTR-T的Datasheet PDF文件第8页浏览型号A4447SLJTR-T的Datasheet PDF文件第9页  
A4447
High Voltage Step Down Regulator
Features and Benefits
Wide input voltage range: 8 to 50 V
Integrated low R
DS(on)
DMOS switch
2 A continuous output current
Adjustable fixed off-time
Highly efficient
Adjustable output: 0.8 to 24 V
Small package with exposed thermal pad
Description
The A4447 is a 2 A, high efficiency general-purpose buck
regulator designed for a wide variety of applications. The output
voltage is adjustable from 0.8 to 24 V, based on a resistor divider
and the 0.8 V ± 2 % reference. External components include
an external clamping diode, inductor, and filter capacitor.
The off-time is determined by an external resistor to ground.
It operates in both continuous and discontinuous modes to
maintain light load regulation. An internal blanking circuit is
used to filter out transients due to the reverse recovery of the
external clamp diode. Typical blanking time is 200 ns.
This new device is ideal for various end products including
applications with 8 to 50 V input voltage range and require up
to 2 A output current, such as uninterruptible power supplies,
point of sale (POS) applications, and industrial applications
with 24 or 36 V bus.
Applications include:
Printer power supplies
Office automation equipment
POS thermal, laser, photo, and inkjet printers
Tape drives
Industrial applications
Package: 8 pin SOIC with exposed thermal
pad (suffix LJ)
Approximate Scale 1:1
Typical Application
+42
V
CBOOT
0.01
μF
CIN2
BOOT
VIN
CIN1
0.22
μF
Efficiency vs. Output Current
90
85
5
3.3
80
75
70
65
60
0
500
1000
1500
2000
1.8
1.5
V
OUT
(V)
ENB
A4447
TSET
RTSET
54 k
GND
LX
L1
VBIAS
R1
2.87 k
FB
R2
910
CBYP
0.22
μF
V
OUT
3.3 V
2A
ESR
COUT
220
μF
25 V
Efficiency %
D1
I
OUT
(mA)
Data is for reference only. Efficiency data from circuit shown in left panel.
A4447-DS, Rev. 1