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MC34653EF/R2 Datasheet(PDF) 19 Page - Freescale Semiconductor, Inc

Part # MC34653EF/R2
Description  1.0 A Negative Voltage Hot Swap Controller
PDF  24 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34653EF/R2 Datasheet(HTML) 19 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
19
34653
TYPICAL APPLICATIONS
Table 6. RICHG Values for Some Desired ICHG Values
Figure 20. External Resistor (RICHG) Value Versus
Charging Current Limit Value (ICHG)
Choosing the External Capacitor CICHG Value
The user can also change the charging current rise time by
adding a capacitor (CICHG) between the ICHG and VIN pins,
as shown in Figure 19, page 17. The charging current rise
time ranges between 1.0 ms (default value) and a
recommended maximum of 10 ms. Table 7 lists examples of
CICHG for different values of tICHGR and Figure 21 shows a
plot of CICHG versus tICHGR.
To calculate the value of the CICHG capacitor we use the
following equation:
CICHG(nF) = 1000 * tICHGR(ms) / [3 * RICHG(kΩ)]
Figure 21. Charging Current External Capacitor (CICHG)
Versus Charging Current Rise Time tICHGR
ICHG(A)
RICHG(kΩ)
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
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)
ICHG (A)
Table 7. CICHG Values for Some Desired tICHGR Values
at a Specific ICHG Value
t ICHGR(ms)
CICHG(nF)
ICHG = 0.05 A
CICHG(nF)
ICHG = 0.1 A
CICHG(nF)
ICHG = 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
200
220
01
23
45
67
89
10
11
TICHGR (m s)
ICHG = 0.05 A
ICHG = 0.1 A
ICHG = 0.5 A
ICHG
ICHG
ICHG
tICHGR (ms)



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