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參數(shù)資料
| 型號： | MCZ34653EFR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 17/24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
Freescale Semiconductor
17
34653
TYPICAL APPLICATIONS
rchived by Freescale Semiconductor, Inc., 2008
TYPICAL APPLICATIONS
The 34653 resides on the plug-in board (see Figures 18
and 19
), allowing the board to be safely inserted or removed
without damaging electrical equipment. The 34653 can be
operated with no external components other than the power
good output signal pull-up resistor if the default mode was
selected for all the programmable features. This is one of the
great advantages of the 34653: it operates with minimal user
interface and minimal external component count and still
offers complete hot swapping functionality with all the
necessary protection features, from undervoltage/
overvoltage detection, to current limiting, to short circuit
protection and power good output signaling. The default
values were chosen to be sufficient for many standard
applications.
Figure 18
is a typical application diagram depicting the
default mode and using the power good output signal pullup
resistor. Refer to the static and dynamic electrical
characteristics tables on pages 5
through 7
for the various
default values.
Figure 18. Typical Application Diagram with Default
Settings and Minimal External Components
The 34653 can be also programmed for different values of
the Overcurrent Limit and the Charging Current Limit using
external components connected to the device. Figure 19
shows the 34653 with the required external components that
allow access to all programmable features in the device.
Figure 19. Typical Application Diagram with External
Components Necessary to Program the Device
UNDERVOLTAGE AND OVERVOLTAGE
DETECTION
The 34653 monitors the input voltage to ensure that it is
within the operating range and that there are no overvoltage
or undervoltage conditions, and to quickly turn off the Power
MOSFET if there are. Internal comparators connected to an
internal resistor divider between the VPWR and VIN input
pins compare the supply voltages with a reference voltage.
The typical default values of 37 V for the UV turn-off threshold
(falling threshold) and 78 V for the OV turn-off threshold
(rising threshold) will give a typical operating range of 38 V to
76 V. This range is suitable for telecom industry standards.
When the device passes the UVLO threshold, it uses the
UV/OV detection circuits to check the input supply levels
before turning on the Power MOSFET during the start-up
Timer delay and thereafter. As long as the voltage is above
the undervoltage falling threshold and below the overvoltage
rising threshold, the supply is within operating range and the
Power MOSFET is allowed to turn on and stay on. If the input
voltage falls below its undervoltage falling threshold or rises
above its overvoltage rising threshold, then one of the start-
up conditions (list on page
10
) is violated and the Power
MOSFET turns off, the power good signal deactivates, and a
new start-up timer initiates. The undervoltage and
overvoltage detection circuits are equipped with a 1.0 ms
filter to filter out momentary input supply dips.
TIMER
The Timer function on the 34653 provides the time base
used to generate the timing sequences at start-up. The same
timer controls the retry delay when the device experiences
any fault. The Timer function has a default timer value of
VPWR
VIN
ICHG ILIM
VOUT
PG
PG
33653
GND
-48 V
DC/DC
Converter
Application
Dependent
Enable/Enable
C
LOAD
44 k?/DIV>
PLUG-IN CARD
VPWR
VIN
ICHG ILIM
VOUT
PG
33653
GND
-48 V
DC/DC
Converter
Application
Dependent
Enable/Enable
C
LOAD
44 k?/DIV>
PLUG-IN CARD
DISABLE
PG
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|---|---|
| MCZ34670EG | 功能描述:熱插拔功率分布 POWER OVER ETHERNET RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MCZ34670EG/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:IEEE 802.3af PD With Current Mode Switching Regulator |
| MCZ34670EGR2 | 功能描述:熱插拔功率分布 POWER OVER ETHERNET RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| 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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