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參數(shù)資料
| 型號： | MAX5955BEEE+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 8/15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 |
| 應用： | 通用 |
| 內部開關： | 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） |
| 供應商設備封裝： | 16-QSOP |
| 包裝： | 管件 |
Startup Period
R
TIM
sets the duration of the startup period from 0.45s
to 50ms (see the Setting the Startup Period, RTIM sec-
tion). The default startup period is fixed at 9ms when
TIM is floating. The startup period begins after the fol-
lowing three conditions are met:
1) V
IN1
or V
IN2
exceeds the UVLO threshold (2.4V) for
the UVLO to startup delay (37.5ms).
2) V
ON1
and V
ON2
exceed the ON threshold (0.875V).
3) The device is not latched or in its autoretry delay (see
the Latched and Autoretry Overcurrent Fault
Management section).
The MAX5955/MAX5956 limit the load current if an
overcurrent fault occurs during startup instead of com-
pletely turning off the external MOSFETs. The slow
comparator is disabled during the startup period and
the load current can be limited in two ways:
1) Slowly enhancing the MOSFETs by limiting the
MOSFET gate-charging current.
2) Limiting the voltage across the external current-
sense resistor.
During the startup period the gate-drive current is limit-
ed to 100礎 and decreases with the increase of the
gate voltage (see the Typical Operating Characteris-
tics). This allows the controller to slowly enhance the
MOSFETs. If the fast comparator detects an overcur-
rent, the MAX5955/MAX5956 regulate the gate voltage
to ensure that the voltage across the sense resistor
does not exceed V
SU,TH
. This effectively regulates the
inrush current during startup. Figure 2 shows the start-
up waveforms. PGOOD_ goes high impedance 0.75ms
after the startup period if no fault condition is present.
VariableSpeed/BiLevel Fault Protection
VariableSpeed/BiLevel fault protection incorporates two
comparators with different thresholds and response
times to monitor the load current (Figure 3). During the
startup period, protection is provided by limiting the
load current. Protection is provided in normal operation
(after the startup period has expired) by discharging
both MOSFET gates with a strong 3mA pulldown cur-
rent in response to a fault condition. After a fault,
PGOOD_ is pulled low, the MAX5955B and MAX5956B
stay latched off and the MAX5955A and MAX5956A
automatically restart.
Slow-Comparator Startup Period
The slow comparator is disabled during the startup
period while the external MOSFETs are turning on.
Disabling the slow comparator allows the device to
ignore the higher-than-normal inrush current charging
the board capacitors when a card is first plugged into a
live backplane.
Low-Voltage, Dual Hot-Swap Controllers with
Independent On/Off Control
8 _______________________________________________________________________________________
t
ON
4.3V TO 5.8V
V
GATE
V
GATE
PGOOD
ON
V
TH
V
OUT
V
OUT
I
LOAD
t
START
+ t
PGDLY
C
BOARD
= LARGE
C
BOARD
= 0
V
SU,TH
R
SENSE
Figure 2. Startup Waveform
SENSE VOLTAGE (V
IN
- V
SENSE
)
V
SC,TH
V
FC,TH
(4 x V
SC,TH
)
3ms
110祍
260ns
SLOW
COMPARATOR
FAST
COMPARATOR
Figure 3. VariableSpeed/BiLevel Response
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相關代理商/技術參數(shù) |
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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