参数资料
型号: A8447SLJTR-T
厂商: Allegro Microsystems Inc
文件页数: 7/9页
文件大小: 0K
描述: IC REG BUCK ADJ 3A 8SOIC
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: 0.8 V ~ 24 V
输入电压: 8 V ~ 50 V
PWM 型: 电流模式
电流 - 输出: 3A
同步整流器:
工作温度: -20°C ~ 85°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: 标准包装
供应商设备封装: 8-SOIC-EP
产品目录页面: 1142 (CN2011-ZH PDF)
其它名称: 620-1174-6
A8447
RTSET Selection. Correct selection of RTSET values will
ensure that minimum on time of the switcher is not violated
High Voltage Step Down Regulator
conditions the resistance on the TSET pin remains as close to the
curve as possible.
and prevent the switcher from cycle skipping. For a given V IN
to V OUT ratio, R TSET must be greater than or equal to the value
defined by the curve in the RTEST Value Selection graph below.
Note. The curve represents the minimum RTSET value. When
calculating R TSET , be sure to use V IN (max) / V OUT (min). Resistor
tolerance should also be considered, so that under all operating
RTSET Value Selection*
Selection Graph
The RTEST Selection table shows recommended R TSET values
based on common operating conditions. For other operating con-
ditions, refer to the RTSET Value Selection graph.
FB Resistor Selection. The impedance of the FB network
should be kept low to improve noise immunity. Large value resis-
tors can pick up noise generated by the inductor, which can affect
voltage regulation of the switcher.
Recommended Common Values
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
V IN
(V)
42
42
42
42
24
24
24
24
12
12
V OUT
(V)
5
3.3
1.8
1.5
5
3.3
1.8
1.5
5
3.3
V IN / V OUT
8.4
12.7
23.3
28
4.8
7.3
13.3
16
2.4
3.6
R TSET Value
(k Ω )
37.4
54.9
90.9
105
20.0
32.4
54.9
66.5
7.68
13.7
0
15
30
45
60
75
90 105 120
R TSET (k Ω )
135
150
165
180
195
210
12
12
1.8
1.5
6.6
8
30.1
37.4
*The R TSET resistor should be not smaller than 7.65 k Ω ±2% to prevent very short off-times from violating the minimum on-time of
the switcher.
Recommended Components
Component
L1
D1
CBYP
CBOOT
CIN
Description
Sumida 68 μ H
NIEC Schottky Barrier Diode 60 V TO-252AA
Ceramic X7A 0.22 μ F 100 V
Ceramic X7A 0.01 μ F 100 V
Electrolytic 100 μ F 50 V; must be able to handle worst case ripple curent
Ceramic X7A 0.22 μ F 50 V
United Chemi-Con PXA 220 μ F 16 V Low ESR
Part Number
RCH1216BNP-680K
NSQ03A06
Generic
Generic
Generic
Generic
PXA16VC221MJ12TP
COUT
Rubycon ZL 220 μ F 25 V Low ESR
(Option 1)
25ZL220M8x11.5
Panasonic FM 220 μ F 25 V Low ESR (Option 2)
V OUT
EEUFM1E221
1.5 V
1.8 V
3.3 V
5V
R1
R2
1.3 k Ω
1.47 k Ω
2.55 k Ω
2 k Ω
2.87 k Ω
0.910 k Ω
6.3 k Ω
1.2 k Ω
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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