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參數資料
| 型號： | MCZ34652EFR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數： | 21/26頁 |
| 文件大小： | 1802K |
| 描述： | IC HOTSWAP CTRLR 2A NEG 16SOIC |
| 標準包裝： | 2,500 |
| 類型： | 熱交換開關 |
| 應用： | 通用 |
| 內部開關： | 是 |
| 電流限制： | 2A |
| 電源電壓： | 15 V ~ 80 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SOIC N |
| 包裝： | 帶卷 (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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