參數(shù)資料
型號(hào)： MCZ34653EFR2
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 20/24頁(yè)
文件大?。?/td> 1649K
描述： IC HOTSWAP CTRLR 1A NEG 8-SOIC
標(biāo)準(zhǔn)包裝： 2,500
類型： 熱交換開(kāi)關(guān)
應(yīng)用： 通用
內(nèi)部開(kāi)關(guān)： 是
電流限制： 1A
電源電壓： 36 V ~ 80 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOICN
包裝： 帶卷 (TR)
Analog Integrated Circuit Device Data
20
Freescale Semiconductor
34653
TYPICAL APPLICATIONS
rchived by Freescale Semiconductor, Inc., 2008
OVERCURRENT LIMIT
When in normal operation mode, the 34653 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 34653 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 34653
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
34653 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 17
. This way the 34653 device is adaptable
to different requirements and operating environments. The
overcurrent value ranges between 0.15 A and 1.25 A, with a
default value of 1.0 A. Table 8
 lists examples of R
ILIM
 for 
different values of I
LIM
 and Figure 22
 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>
Table 8. R
ILIM
 Values for Some Desired I
LIM
 Values
 Figure 22. External Resistor (R
ILIM
) Value Versus
Current Limit Value (I
LIM
)
SHORT CIRCUIT DETECTION
If the current going through the load becomes > 5.0 A, the
Power MOSFET is discharged very fast (in less than 10 約)
to try to regulate the current, and the 34653 is in the
overcurrent mode for 3.0 ms. Then it follows the pattern
outlined in the Overcurrent Limit
 paragraph above.
I
LIM
 (A)    R
ILIM
 (k?/SPAN>)
0.15
859.71
0.2
644.43
0.3
429.15
0.4
321.52
0.5
256.93
0.6
213.88
0.7
183.12
0.8
160.06
0.9
142.12
1.0
127.77
1.1
116.02
1.2
106.24
1.25
101.93
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
850
900
0.0  0.2  0.4  0.6  0.8  1.0  1.2  1.4
ILIM (A)
I
LIM
 (A)
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