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參數(shù)資料
| 型號： | MAX5978ETJ+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 17/38頁 |
| 文件大?。?/td> | 2412K |
| 描述： | IC CTLR HOT-SWAP 32TQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 類型： | 熱交換控制器 |
| 應用： | 刀峰式服務器，網(wǎng)絡應用設備 |
| 內部開關： | 無 |
| 電流限制： | 可調 |
| 電源電壓： | 2.7 V ~ 16 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 32-TQFN-EP（5x5） |
| 包裝： | 管件 |
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0 to 16V, Hot-Swap Controller with 10-Bit
Current, Voltage Monitor, and 4 LED Drivers
17
Setting Circuit-Breaker Thresholds
To select and set the device slow-trip and fast-trip com-
parator thresholds, use the following procedure:
1) Select one of four ratios between the fast-trip thresh-
old and the slow-trip threshold: 200%, 175%, 150%,
or 125%. A system that experiences brief but large
transient load currents should use a higher ratio,
whereas a system that operates continuously at high-
er average load currents might benefit from a smaller
ratio to ensure adequate protection. The ratio is set by
writing to the ifast2slow register. (The default setting
on power-up is 200%.)
2) Determine the slow-trip threshold V
TH,ST
based on the
anticipated maximum continuous load current during
normal operation, and the value of the current-sense
resistor. The slow-trip threshold should include some
margin (possibly 20%) above the maximum load cur-
rent to prevent spurious circuit-breaker shutdown and
to accommodate passive component tolerances:
V
TH,ST
= R
SENSE
x I
LOAD,MAX
x 120%
3) Calculate the necessary fast-trip threshold V
TH,FT
based on the ratio set in step 1:
V
TH,FT
= V
TH,ST
x (ifast2slow ratio)
4) Select one of the three maximum current-sense
ranges: 25mV, 50mV, or 100mV. The current-sense
range is initially set upon power-up by the state of the
IRNG input, but can be altered at any time by writ-
ing to the status2 register. For maximum accuracy
and best measurement resolution, select the lowest
current-sense range that is larger than the V
TH,FT
value calculated in step 3.
5) Program the fast-trip and slow-trip thresholds by writ-
ing an 8-bit value to the dac_fast register. This 8-bit
value is determined from the desired V
TH,ST
value
that was calculated in step 2, the threshold ratio from
step 1, and the current-sense range from step 4:
DAC = V
TH,ST
x 255 x (ifast2slow ratio)/
(IRNG current-sense range)
The device provides a great deal of system flexibil-
ity because the current-sense range, DAC setting, and
threshold ratio can be changed on the fly for systems
that must protect a wide range of interchangeable
load devices, or for systems that control the allocation
of power to smart loads. Table 5 shows the specified
ranges for the fast-trip and slow-trip thresholds for all
combinations of current-sense range and threshold ratio.
When an overcurrent event causes the device to shut
down the power channel, the open-drain FAULT output
alerts the system. Figure 2 shows the operation and fault-
management flowchart.
Table 4a. ifast2slow Register Format
Table 4b. Setting Fast-Trip to Slow-Trip Threshold Ratio
Description:
Current threshold fast-to-slow setting bits
Resister Title:
ifast2slow
Register Address:
0x30
RESET
VALUE
R
R
R
R
R/W
R/W
R/W
R/W
Unused
Unused
FS1
FS0
0x0F
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
FS1
FS0
FAST-TRIP TO SLOW-TRIP RATIO (%)
0
0
125
0
1
150
1
0
175
1
1
200
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5978ETJ+ | 功能描述:熱插拔功率分布 0-16V 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 |
| MAX5978ETJ+T | 功能描述:熱插拔功率分布 0-16V 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 |
| MAX5980EVKIT# | 功能描述:電源開關 IC - POE / LAN MAX5980 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 開關數(shù)量:Single 開關配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關閉時間（最大值）:20 ns 切換電壓（最大）: 工作電源電壓:8 V to 26 V 最大工作溫度:+ 125 C 安裝風格:Through Hole 封裝 / 箱體:TO-220F-6 |
| MAX5980EVKIT+ | 功能描述:電源開關 IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關數(shù)量:Single 開關配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關閉時間（最大值）:20 ns 切換電壓（最大）: 工作電源電壓:8 V to 26 V 最大工作溫度:+ 125 C 安裝風格:Through Hole 封裝 / 箱體:TO-220F-6 |
| MAX5980GTJ+ | 功能描述:電源開關 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 開關數(shù)量:Single 開關配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關閉時間（最大值）:20 ns 切換電壓（最大）: 工作電源電壓:8 V to 26 V 最大工作溫度:+ 125 C 安裝風格:Through Hole 封裝 / 箱體:TO-220F-6 |
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