參數(shù)資料
型號： MAX5955BEEE+
廠商： Maxim Integrated
文件頁數(shù)： 11/15頁
文件大?。?/td> 354K
描述： IC DUAL HOT-SWAP CTRLR 16-QSOP
產(chǎn)品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 100
類型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開關(guān)： 無
電源電壓： 1 V ~ 13.2 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 管件
Setting the Startup Period, R
TIM
The startup period (t
START
) is adjustable from 0.45ms to
50ms. The adjustable startup period feature allows sys-
tems to be customized for MOSFET gate capacitance
and board capacitance (C
BOARD
). The startup period is
adjusted with the resistance connected from TIM to GND
(R
TIM
). R
TIM
must be between 4k& and 500k&. The
startup period has a default value of 9ms when TIM is left
floating. Calculate R
TIM
with the following equation:
where t
START
is the desired startup period.
Startup Sequence
There are two ways of completing the startup sequence.
Case A describes a startup sequence that slowly turns
on the MOSFETs by limiting the gate charge. Case B
uses the current-limiting feature and turns on the
MOSFETs as fast as possible while still preventing a high
inrush current. The output voltage ramp-up time (t
ON
) is
determined by the longer of the two timings, case A and
case B. Set the startup timer t
START
to be longer than t
ON
to guarantee enough time for the output voltage to settle.
Case A: Slow Turn-On (Without Current Limit)
There are two ways to turn on the MOSFETs without
reaching the fast-comparator current limit:
"  If the board capacitance (C
BOARD
) is small, the
inrush current is low.
"  If the gate capacitance is high, the MOSFETs turn
on slowly.
In both cases, the turn-on time is determined only by the
charge required to enhance the MOSFET. The small
gate-charging current of 100礎(chǔ) effectively limits the out-
put voltage dV/dt. Connecting an external capacitor
between GATE and GND extends turn-on time. The time
required to charge/discharge a MOSFET is as follows:
where:
C
GATE
is the external gate to ground capacitance
(Figure 4).
V
GATE
is the change in gate voltage.
Q
GATE
is the MOSFET total gate charge.
I
GATE
is the gate-charging/discharging current.
In this case, the inrush current depends on the MOSFET
gate-to-drain capacitance (C
rss
) plus any additional
capacitance from GATE to GND (C
GATE
), and on any
load current (I
LOAD
) present during the startup period.
Example: Charging and Discharging Times Using
the Fairchild FDB7030L MOSFET
If V
IN1
= 5V then GATE1 charges up to 10.4V (V
IN1
+
V
DRIVE
); therefore V
GATE
= 10.4V. The manufacturers
data sheet specifies that the FDB7030L has approxi-
mately 60nC of gate charge and C
rss
= 600pF. The
MAX5955/MAX5956 have a 100礎(chǔ) gate-charging cur-
rent and a 3mA strong discharging current.
I
C
C
C
I
I
INRUSH
BOARD
rss
GATE
GATE
LOAD
=
+
?/DIV>
+
 
 
 
t
C
V
Q
I
GATE
GATE
GATE
GATE
=
?
+
R
t
pF
TIM
START
=
?/DIV>
128  800
Low-Voltage, Dual Hot-Swap Controllers with
Independent On/Off Control
______________________________________________________________________________________   11
COMPONENT
MANUFACTURER
PHONE
WEBSITE
Dale-Vishay
402-564-3131
www.vishay.com
Sense Resistors
IRC
704-264-8861
www.irctt.com
Fairchild
888-522-5372
www.fairchildsemi.com
International Rectifier
310-233-3331
www.irf.com
MOSFETs
Motorola
602-244-3576
www.mot-sps.com/ppd
Table 3. Component Manufacturers
GATE
SENSE
GND
ON_
*
* REQUIRED COMPONENTS. SEE THE ON_ COMPARATORS SECTION.
R
SENSE
V
OUT
C
GATE
C
BOARD
V
IN
IN_
R
PULLUP
PGOOD_
MAX5955
MAX5956
0.1礔
Figure 4. Operating with an External Gate Capacitor
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參數(shù)描述
MAX5955BEEE+ 功能描述:熱插拔功率分布 Dual Hot-Swap Controller 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5955BEEE+T 功能描述:熱插拔功率分布 Dual Hot-Swap Controller 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5955BEEE-T 功能描述:熱插拔功率分布 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5955BUEE 功能描述:熱插拔功率分布 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5955BUEE+ 功能描述:熱插拔功率分布 Dual Hot-Swap Controller 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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