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| 型号： | MCZ34652EFR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 21/26页 |
| 文件大小： | 1802K |
| 描述： | IC HOTSWAP CTRLR 2A NEG 16SOIC |
| 标准包装： | 2,500 |
| 类型： | 热交换开关 |
| 应用： | 通用 |
| 内部开关： | 是 |
| 电流限制： | 2A |
| 电源电压： | 15 V ~ 80 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC N |
| 包装： | 带卷 (TR) |
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
34652
TYPICAL APPLICATIONS
rchived by Freescale Semiconductor, Inc., 2008
The low charging current value of I
CHG
is intended to limit
the temperature increase during the load capacitor charging
process, and the gradual rise to I
CHG
is to prevent transient
dips in the input voltage due to sharp increases in the limit
current. This prevents the input voltage from drooping due to
current steps acting on the input line inductance, and that in
turn prevents a premature activation of the UV detection
circuit.
Choosing the External Resistor R
ICHG
Value
The user can change the value of the charging current limit
by adding a resistor (R
ICHG
) between the ICHG and VIN pins,
as shown in Figure 19
, page 18
. The charging current value
ranges between 50 mA and 500 mA, with a default value of
100 mA. Table 7
lists examples of R
ICHG
for different values
of I
CHG
and Figure 21
shows a plot of R
ICHG
versus I
CHG
. It is
recommended that the closest 1% standard resistor value to
the actual value be chosen.
Note Accuracy requirements are application dependent.
To calculate the value of the R
ICHG
resistor we use the
following equations:
I
CHG
(A)
= [ R
ICHG
(k? + 1.4 k / 335
R
ICHG
(k? = 335
*
I
CHG
(A)
- 1.4 k?/DIV>
Table 7. R
ICHG
Values for Some Desired I
CHG
Values
Figure 21. External Resistor (R
ICHG
) Value Versus
Charging Current Limit Value (I
CHG
)
Choosing the External Capacitor C
ICHG
Value
The user can also change the charging current rise time by
adding a capacitor (C
ICHG
) between the ICHG and VIN pins,
as shown in Figure 19
, page 18
. The charging current rise
time ranges between 1.0 ms (default value) and a
recommended maximum of 10 ms. Table 8
lists examples of
C
ICHG
for different values of t
ICHGR
and Figure 22
shows a
plot of C
ICHG
versus t
ICHGR
.
To calculate the value of the C
ICHG
capacitor we use the
following equation:
C
ICHG
(nF) = 1000
*
t
ICHGR
(ms) / [ 3
*
R
ICHG
(k? ]
I
CHG
(A) R
ICHG
(k?/SPAN>)
0.05
15.35
0.1
32.10
0.15
48.85
0.2
65.60
0.25
82.35
0.3
99.10
0.35
115.85
0.4
135.60
0.45
149.35
0.5
166.10
Table 8. C
ICHG
Values for Some Desired t
ICHGR
Values
at a Specific I
CHG
Value
t
ICHGR
(ms)
C
ICHG
(nF)
I
CHG
= 0.05 A
C
ICHG
(nF)
I
CHG
= 0.1 A
C
ICHG
(nF)
I
CHG
= 0.5 A
1.0
21.72
10.38
2.01
2.0
43.43
20.77
4.01
3.0
65.15
31.15
6.02
4.0
86.86
41.54
8.03
5.0
108.58
51.92
10.03
6.0
130.29
62.31
12.04
7.0
152.01
72.69
14.05
8.0
173.72
83.07
16.05
9.0
195.44
93.46
18.06
10
217.16
103.84
20.07
0
20
40
60
80
100
120
140
160
180
0 0.1 0.2 0.3 0.4 0.5 0.6
ICHG (A)
I
CHG
(A)
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| MCZ34652EFR2SCALE | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:2.0 A Negative Voltage Hot Swap Controller with Enhanced Programmability |
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| MCZ34653EFR2 | 功能描述:热插拔功率分布 Hot Swap Controller 1.0 Neg Vltg RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MCZ34670EG | 功能描述:热插拔功率分布 POWER OVER ETHERNET RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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