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參數(shù)資料
| 型號(hào)： | MAX5984AETI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTRLR PD IEEE W/MOSFT 28TQFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
______________________________________________________________________________________ 15
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
PD Classification
During the PD classification mode, the MAX5984 forces
a probe voltage (-18V typ) at DET and measures the
current into DET. The measured current determines the
class of the PD. If the ILIM1 and ILIM2 pins are both left
unconnected, the MAX5984 classifies the PD based on
Table 33.9 of the IEEE 802.3at standard (Table 2). If the
measured current exceeds 51mA, the MAX5984 does
not power the PD, but returns to the idle state before
attempting a new detection cycle.
Class 5 PD Classification
The MAX5984 supports high power beyond the IEEE
802.3at standard by providing an additional classifica-
tion (Class 5) if needed. To enable Class 5 detection
and select the corresponding current-limit/overcurrent
thresholds, ILIM1 and ILIM2 must be set based on
the combinations detailed in Table 3. Once Class 5 is
enabled, during classification, if the MAX5984 detects
currents in excess of the Class 4 upper limit threshold,
the PD is classified as a Class 5 PD. The PD is guar-
anteed to be classified as a Class 5 device for any
classification current from 51mA up to the classification
current-limit threshold.
The Class 5 overcurrent threshold and current limit is
set with ILIM1 and ILIM2. ILIM1 and ILIM2 are both
referenced to VEE and are internally pulled up to the
digital supply. Leave ILIM1 and ILIM2 unconnected to
disable Class 5 detection and to be fully compliant to
IEEE 802.3at standard classification. Class 5 detection
is enabled, and the corresponding overcurrent threshold
and current limit is adjusted, by connecting one or both
to VEE (Table 3).
2-Event PD Classification
If the result of the first classification event is Class 0
through Class 3, then only a single classification event
occurs, as shown in Figure 1. However, if the result is
Class 4 or Class 5 (when enabled), the device performs
a second classification event, as shown in Figure 2.
Between the classification cycles, the MAX5984 per-
forms a first and second mark event as required by the
IEEE 802.3at standard, forcing a -9.0V probing voltage
at DET. The 2-Event function is disabled by default in the
MAX5984A/MAX5984B/MAX5984E. However, it is not
pin-selectable in the MAX5984E.
Powered State
When the MAX5984 enters a powered state, the tFAULT
and tDISC timers are reset. When the startup timer has
timed out, the device enters a normal powered condition,
allowing power delivery to the PD.
Table 2. PSE Classification of a PD (Table
33.9 of the IEEE 802.3at Standard)
Table 3. Class 5 Overcurrent Threshold and Current-Limit Settings
MEASURED ICLASS (mA)
CLASSIFICATION
0 to 5
Class 0
> 5 and < 8
Can be Class 0 or 1
8 to 13
Class 1
> 13 and < 16
Either Class 1 or 2
16 to 21
Class 2
> 21 and < 25
Either Class 2 or 3
25 to 31
Class 3
> 31 and < 35
Either Class 3 or 4
35 to 45
Class 4
> 45 and < 51
Either Class 4 or Invalid
ILIM1
CONFIGURATION
ILIM2
CONFIGURATION
OVERCURRENT
THRESHOLD (mA)
CURRENT
LIMIT (mA)
Unconnected
Class 5 disabled
VEE
Unconnected
748
850
Unconnected
VEE
792
900
VEE
836
950
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| MAX5984BETI+ | 制造商:Maxim Integrated Products 功能描述:SINGLE-PORT 40W IEEE 802.3AF/AT PSE CONTROLLER WITH INTEGRAT - Rail/Tube |
| MAX5984CETI+ | 制造商:Maxim Integrated Products 功能描述:SINGLE-PORT 40W IEEE 802.3AF/AT PSE CONTROLLER WITH INTEGRAT - Rail/Tube |
| MAX5984DETI+ | 功能描述:其他電源管理 1-Port 40W IEEE 802.3af/at PSE Ctlr RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX5984DETI+T | 功能描述:其他電源管理 1-Port 40W IEEE 802.3af/at PSE Ctlr RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX5986AETE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 IEEE802.3 af PD w/ DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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