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參數(shù)資料
| 型號： | SI3452MS8-KIT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 34/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR SI3452 |
| 特色產(chǎn)品： | Si3452 Quad High-Voltage Port Controller for PoE and PoE+PSEs |
| 標準包裝： | 1 |
| 主要目的： | 特殊用途 DC/DC，以太網(wǎng)供電（POE） |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | Si3452 |
| 其它名稱： | 336-1836 |
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Si3452
Rev. 1.3
7
Table 6. VOUT Drive and Power-on Specifications
Description
Symbol
Test Conditions
Min
Typ
Max
Unit
Max Output Resistance
(Port On)
RON
IPort ≤ 720 mA
—
0.3
0.6
Current Limit
ILIM
1x mode, Vport =VEE + 1 V
400
425
450
mA
Change in Current Limit
ILIM
–2
—
2
%
Current Limit
ILIM
2x mode, Vport =VEE + 1 V
800
860
920
mA
Change in Current Limit
ILIM
–2
—
2
%
Current Limit
ILIM
1x mode or 2x mode, Vport =–10 V
60
—
mA
Overload Current
Threshold
ICUT
Class 0
Class 1 (class policing enabled)3
Class 2 (class policing enabled)3
Class 3
Class 44
350
91
160
350
600
—
mA
Over Current Time
Limit5
TOVLD
Load current ≥ ICUT or ILIM
50
—
75
ms
VOUTn Turn-on Slew
TRISE
10% to 90%
15
70
—
s
Power Turn On Timing
TPON
Time from end of valid detect to
power on
——
400
ms
VOUTn Leakage Cur-
rent
IOUT_LEAK
Port in shutdown
—
10
A
Notes:
1.
TJ >25 °C, –35 V over the full temperature range.
2.
1x mode current limit is enforced during the 60 ms TSTART time.
3.
In auto mode, class policing is automatically enabled. In manual mode, ICUT must be programmed manually.
See "5.4. Port Configuration (Registers 0x0A–0x11)" on page 18 for more information.
4.
600 mA is consistent with the IEEE 802.3at draft standard. ICUT is user-programmable in 3.2 mA increments to over
800 mA for non-standard applications.
5.
For 2x mode and extreme overload or short-circuit events, TOVLD will dynamically decrease to prevent excessive FET
heating. This is consistent with the 802.3at draft.
Table 7. dV/dt Disconnect Specifications
Description
Symbol
Test Conditions
Min
Typ
Max
Unit
Load Current to Prevent
Disconnect
ION
10
—
mA
Load Current to
Guarantee Disconnect
IOFF
dV/dt disconnect
—
2
mA
Disconnect Delay
TDCDV_DLY
Time from IOFF load current to port
turn off
300
—
400
ms
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