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參數(shù)資料
| 型號： | MCZ34653EFR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 1649K |
| 描述： | IC HOTSWAP CTRLR 1A NEG 8-SOIC |
| 標準包裝： | 2,500 |
| 類型： | 熱交換開關(guān) |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(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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| MCZ34701EW | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.5A Sw-Mode Power Supply w/Linear Reg RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MCZ34701EWR2 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 1.5A Sw-Mode Power Supply w/Linear Reg RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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