参数资料
| 型号： | A4403GEUTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16QFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 9 V ~ 46 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 450kHz ~ 2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（4x4） |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1273-6 |
A4403
Valley Current Mode Control Buck Converter
In terms of grounding the power components, a star connection
should be made to minimize the ground loop impedances. Note
that, although a ground plane may be required to meet the ther-
mal characteristics of the solution, it is still imperative to imple-
ment a star ground connection for the power components.
Figures 5 and 6 illustrate the importance of keeping the ground
connections as short as possible and forming good star connec-
tions.
Figure 5 also illustrates the current conduction paths during the
on-cycle of the switching FET. The following points should be
noted:
? The capacitor C IN should be placed as close as possible to the
VIN terminal.
? The inductor L should placed as close as possible to the LX
terminal and to the output capacitors C OUT .
? Good separation should exist between the LX connection and
any adjacent components or traces.
Figure 6 shows the current conduction path during the off-cycle
of the switching FET. The following points should be noted:
? The diode D should be placed as close as possible to both the
switching FET and to the inductor. The resistor R should be
placed as close as possible to the diode D.
? The boostrap capacitor, C2, and the soft start capacitor, C5,
should be located as close as possible to their respective termi-
nal connections. The ground reference of the soft start capacitor
should be connected as close to the GND terminal as possible.
V IN
9 to 46 V
R1
100 k Ω
C1
2.2 μ F
100 V
VIN
BOOT
LX
C2
22 nF
L 1
6.3 μ H
V OUT
5.0 V
3A
D1
TON
DIS
SS
A 4403
ISEN
SGND
C7
1 nF
R2
47 Ω
R3
100 m Ω
C3
10 μ F
6.3 V
R4
100 m Ω
C4
10 μ F
6.3 V
R5
3.92 k Ω
C6
10 nF
C5
47 nF
FB
NC
GND
R6
750 Ω
Switching Frequency = 1 MHz
All capacitors are X5R or X7R ceramic
Resistors R3 and R4 should be surface mount, low inductance type, rated at 250 mW at 70°C
Figure 7. Typical application
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
14
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