參數(shù)資料
型號(hào)： MCZ34652EFR2
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 13/26頁(yè)
文件大?。?/td> 1802K
描述： IC HOTSWAP CTRLR 2A NEG 16SOIC
標(biāo)準(zhǔn)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： 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(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 帶卷 (TR)
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
34652
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
rchived by Freescale Semiconductor, Inc., 2008
 Figure 7. Power MOSFET Turn-On and the Gradual
Increase in the Charging Current from 0 A to I
CHG
 
(2.0 ms in Example)
The I
CHG
 current charges up the load capacitor relatively
slowly. When the load capacitor is fully charged, the Power
MOSFET reaches its full enhancement, which triggers the
current limit detection to change from I
CHG
 to I
LIM
 and the load 
current to decrease (Point C in Figure 6
, page 12
). The
current spike at Point C in Figure 6
 is better displayed in
Figure 8
. We can see that when the 淰
OUT
 - V
IN
 ? 0.5 V, the
Power MOSFET fully turns on to reach its full enhancement,
charging the capacitor an additional 0.5 V with a higher
current value that quickly ramps down. This eliminates the
need for a current slew rate control because the hazard for a
voltage change is less than 0.5 V. The power good output
signals activate after a 20 ms delay (Point D in Figure 6
),
which in turn enables the load. The 34652 is now in normal
operation mode and the retry counter resets.
 Figure 8. Full Power MOSFET Turn-On and Current
Spike Associated with It. End of Charging Process
NORMAL MODE
If one of the start-up conditions (list on page 
12
) is violated
any time from the start of the Power MOSFET enhancement
process and thereafter during normal operation, the Power
MOSFET turns off and the power good output signals
deactivate, disabling the load, and a new timer cycle starts as
explained previously. The 34652 also monitors the load
current to prevent any overload or short circuit conditions
from happening in order to protect the load from damage.
LOAD CURRENT CONTROL
When in normal operation mode, the 34652 monitors the
load and provides two modes of current control as explained
in the paragraphs below.
Overcurrent Mode
The 34652 monitors the load for overcurrent conditions. If
the current going through the load becomes larger than the
overcurrent limit for longer than the overcurrent limit filter
timer of 100 約, the overcurrent signal is asserted and the
gate of the Power MOSFET is discharged to try to regulate
the current at the I
LIM
value
 
(Point A in Figure 9
). The 34652
is in overcurrent mode for 3.0 ms. If after a 3.0 ms filter timer
the device is still in overcurrent mode, the device turns off the
Power MOSFET and deactivates the power good output
signals (Point B in Figure 9
). 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, then
the 34652 goes back to the normal operation mode and the
power good output signals stay activated as shown in
Figure 10
, page 14
. This way the device overcomes
temporary overcurrent situations and at the same time
protects the load from a more severe overcurrent situation.
 Figure 9. Overcurrent Mode for More Than 3.0 ms
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