參數(shù)資料
型號： MCZ34652EFR2
廠商： Freescale Semiconductor
文件頁數(shù)： 15/26頁
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
15
34652
FUNCTIONAL DEVICE OPERATION
PROTECTION FEATURES
rchived by Freescale Semiconductor, Inc., 2008
BOARD REMOVAL
When the board is removed, its power ramps down. As
soon as the 34652s input voltage reaches the undervoltage
turn-off threshold, the undervoltage detection circuit activates
and the Power MOSFET turns off for having violated one of
the start-up conditions (list on page 
12
).
34652 STATE MACHINE DIAGRAM
Figure 13
 is a representation of the 34652 behavior in
different modes of operation.
 Figure 13. State Diagram
PROTECTION FEATURES
UNDERVOLTAGE
When the voltage on the UV pin drops below the
undervoltage falling threshold for more than 1.0 ms, an
undervoltage fault is detected and one of the start-up
conditions (list on page 
12
) is violated. The 34652 turns off
the Power MOSFET and deactivates the power good output
signals, disabling the load (Point A in Figure 14
). The 34652
stays in this state until the voltage on the UV pin rises above
the undervoltage rising threshold for more than 1.0 ms,
signaling that the supply voltage is in the normal operation
range (Point B in Figure 14
). Then a new start-up sequence
initiates as described on page 
12
. The undervoltage
detection circuit is also equipped with a 1.0 V hysteresis
when in default mode. The hysteresis value depends on the
undervoltage detection threshold and can be calculated as
follows:
V
UVHY
= V
UV (RISING)
*
 [1 - (1.3 V - V
UVCHY
) / 1.3 V ]
 Figure 14. Undervoltage Fault Followed by a
New Start-Up Sequence
MOSFET ?OFF
PG = 0
Undervoltage
MOSFET ?OFF
PG = 0
Power Off
Temp < 135癈
Filter = 12約
V
PWR
< V
UVLOF
Filter = 1.0ms
 
 
A signal set is generated to check
resistors on UV, ILIM, ICHG, and
TIMER pins and 128約 later
the OV pin
Retry Fault
STOP
Toggle DISABLE
or cycle Power Off
then On to clear fault
Power
Good Check
and V
DS
 < 500mV
for 20ms
Charging Mode
N d 10
Turn Off
MOSFET ?OFF
PG = 0
PG = 1
N = 0
V
PWR
 > V
UVLOR
 
Filter = 1.0 ms
 
Filter = 3.0 ms
I
LOAD
 > I
LIM
I
LOAD
 < I
LIM
 - I
LIMHY
Short Circuit
Detection
Fast Gate Discharge
< 10約
I
LOAD
 > I
SHORT
Overcurrent
for > 3.0 ms
Pass PG
Check
Fail PG
Check
N > 10
 
 
for 100 約
V
PWR
< V
UV(OFF)
Filter = 1.0ms
MOSFET ?OFF
PG = 0
Overvoltage
V
PWR
 < V
OV(ON)
V
PWR
> V
OV(OFF)
Filter = 1.0ms
Filter = 1.0ms
PG = 0
MOSFET ?OFF
Temp > 160癈
Filter = 12約
Thermal
Shutdown
Ext. Resistor Check
POR is generated
N = 0
MOSFET ?OFF
PG = 0
DISABLE
POR is generated
N = 0
DISABLE = 1
Filter = 1.0ms
DISABLE = 0
Filter = 1.0 ms
V
PWR
 > V
UV(ON)
Filter = 1.0ms
If I
LOAD
 < I
LIM
Overcurrent Mode
Normal Operation
V
DS
 < 500mV
Start-Up Conditions
" Thermal Shutdown < 160癈
Filter = t
TIMER
" V
PWR
 > V
UV(OFF)
" V
PWR
 < V
OV(OFF)
N = N + 1
" DISABLE = 0
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