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| 型号： | MC34652EFR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 22/26页 |
| 文件大小： | 1802K |
| 描述： | IC CTRLR HOT SWAP NEG V 16-SOIC |
| 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
22
Freescale Semiconductor
34652
TYPICAL APPLICATIONS
rchived by Freescale Semiconductor, Inc., 2008
Figure 22. Charging Current External Capacitor (C
ICHG
)
Versus Charging Current Rise Time (t
ICHGR
)
OVERCURRENT LIMIT
When in normal operation mode, the 34652 monitors the
load and compares (with a hysteresis) the current going
through a Sensor MOSFET with a reference current value
generated in reference to the current limit value I
LIM
. If the
current going through the Sensor MOSFET becomes larger
than the reference current for more than 100 約, the
overcurrent signal is asserted, the gate of the Power
MOSFET is discharged fast (in less than 10 約) to try to
regulate the current, and the 34652 is in overcurrent mode for
3.0 ms. If after a 3.0 ms filter time the device is still in
overcurrent mode, the device turns off the Power MOSFET
and deactivates the power good output signals. The 34652
then initiates another start-up timer and goes back through
the enhancement process. If during the 3.0 ms timer the fault
was cleared where the load current was less than I
LIM
minus
the hysteresis value, which is 12% of I
LIM
value, then the
34652 goes back to the normal operation mode and the
power good output signals stay activated. This way the
device overcomes temporary overcurrent situations and at
the same time protects the load from more severe
overcurrent situations.
When the device passes the UVLO threshold, it checks if
there is any external resistor connected to the ILIM pin. If
there is, it determines the value of the overcurrent limit. If
there is not, it uses the default overcurrent limit value of 1.0 A.
It then uses the Sensor MOSFET to monitor the load for any
overcurrent conditions during operation as explained in the
previous paragraph.
Choosing the External Resistor R
ILIM
Value
The user can change the current limit by adding a resistor
(R
ILIM
) between the ILIM
and VIN pins, as shown in
Figure 19
, page 18
. This way the 34652 device is adaptable
to different requirements and operating environments. The
overcurrent value ranges between 0.35 A and 2.25 A, with a
default value of 1.0 A. Table 9
lists examples of R
ILIM
for
different values of I
LIM
and Figure 23
shows a plot of R
ILIM
versus I
LIM
. 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
ILIM
resistor we use the
following equations:
I
LIM
(A) = 129 / [ R
ILIM
(k? + 1.4 k?]
R
ILIM
(k? = [ 129 / I
LIM
(A)] - 1.4 k?/DIV>
Figure 23. External Resistor (R
ILIM
) Value Versus
Current Limit Value (I
LIM
)
0
20
40
60
80
100
120
140
160
180
200
220
0 1 2 3 4 5 6 7 8 9 10 11
TICHGR (ms)
ICHG = 0.05 A
ICHG = 0.1 A
ICHG = 0.5 A
I
CHG
I
CHG
I
CHG
t
ICHGR
(ms)
Table 9. R
ILIM
Values for Some Desired I
LIM
Values
I
LIM
(A) R
ILIM
(k?/SPAN>) I
LIM
(A) R
ILIM
(k?/SPAN>)
0.35
367.65
1.5
84.71
0.4
321.52
1.6
79.33
0.5
256.93
1.7
74.58
0.6
213.88
1.8
70.36
0.7
183.12
1.9
66.58
0.8
160.06
2.0
63.18
0.9
142.12
2.1
60.11
1.0
127.77
2.2
57.31
1.1
116.02
2.25
56.01
1.2
106.24
1.3
97.96
1.4
90.86
0
50
100
150
200
250
300
350
400
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
ILIM (A)
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