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channel outputs, auxiliary and main. A fault condition
occurs when the output voltage falls below the set
undervoltage threshold or the output current reaches the
overcurrent threshold. When a fault occurs, all supplies
of the affected channel are disabled after a time period
t
DELAY
. All outputs are automatically restarted after a
time equal to t
RESTART
. This reset is built into all devices.
Current Limits
All supplies are protected against output overcurrent or
short-circuit conditions. The MAX5915/MAX5915A and
MAX5916/MAX5916A employ a
“
brickwall
”
current limit
on the +3.3V and +5V supplies and a current-foldback
scheme on the ±12V and +3.3V auxiliary supplies.
Brickwall
A brickwall current limit protects the +3.3V and +5V
main supplies by limiting the load current. The external
sense resistors and the current-limit threshold set the
brickwall current limits. A fault occurs when the load
current reaches the brickwall limit. The main outputs
shut down after t
DELAY
if the fault remains. The brick-
wall feature limits inrush current caused by positive
supply voltage steps.
Foldback
The ±12V and +3.3V auxiliary supplies employ an
internal current-foldback scheme. The MAX5915/
MAX5915A/MAX5916/MAX5916A gradually limit the load
current once the current-foldback threshold is reached. If
the overcurrent condition lasts longer than a fast tran-
sient, the output current is reduced to the foldback cur-
rent limit and remains at that level for t
DELAY
unless the
overcurrent condition is cleared. See the
Typical
Operating Characteristics
.
M
Dual PCI 2.2 Hot-Swap Controllers
______________________________________________________________________________________
13
t
START
ON_
+12VIN
3.3VAUX UVLO THRESHOLD
3.3VAUXIN
PGOOD_
TIMING NOT TO SCALE
AUXON_
+12V
UVLO THRESHOLD
+12VO_
-12VO_
5VO_
3.3VO_
3.3VAUXO_
Figure 1. Startup Waveforms
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5917BESE | +65V Simple Swapper Hot-Swap Switches |
| MAX5910 | +65V Simple Swapper Hot-Swap Switches |
| MAX5910ESA | +65V Simple Swapper Hot-Swap Switches |
| MAX5919AEEE | Low-Voltage, Dual Hot-Swap Controllers with Independent ON/OFF Control |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5916EUI+ | 功能描述:熱插拔功率分布 Dual PCI 2.2 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916EUI+T | 功能描述:熱插拔功率分布 Dual PCI 2.2 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916EUI-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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916UUI+ | 功能描述:熱插拔功率分布 Dual PCI 2.2 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916UUI+T | 功能描述:熱插拔功率分布 Dual PCI 2.2 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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