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參數(shù)資料
| 型號： | PD64012 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 12-channel PoE Manager |
| 中文描述： | 12通道供電管理 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 496K |
| 代理商： | PD64012 |
PD64012
12-CHANNEL PoE MANAGER
P
main
= V
main
x I
main
P
main
typ. = 48 VDC x 10 mA = 0.480 W
.
P
main
max. = 57 VDC x 15 mA = 0.855 W
Device Power Dissipation
– the PD64012 incorporates 12 power MOSFETs, each characterized by:
Resistance from drain-source R
ds(on)
= 0.3
typ. ; 0.5
max.
Drain-source current I
ds
= 360 mA max.
Maximum power dissipation P
MOSFET
max. of a single PD64012 device (for 12 MOSFETs) :
[(I
ds
)
2
x R
ds(on)
]
x 12 = [(0.36 A)
2
x 0.5
]
x 12 = 0.78 W
Charge pump (see Analog Section of Block Diagram Description, hereafter) power dissipation P
CP
is 0.21 W.
Total power dissipation P
total
by device, under maximum conditions:
P
total
= P
main
max. + P
MOSFET
max. + P
CP
= 0.855 W + 0.78 W + 0.21 W = 1.845 W
I
lim
I
cut
I
min
T
min
UDL_S
UDL
Port off
OVL
T
cut
OVL_S
I
channel
Port 1
Port 2
Figure 2: Power Limits
Protection Mechanism
The PD64012 includes internal thermal protection to avoid junction overheat. Three types of temperature sensors
are integrated into the device: two are used for protection and one for temperature monitoring.
Hi-temp protection
– the device contains thermal shutdowns. This protection system is activated in extreme
conditions.
Lo-temp protection
– there are thermal sensors that are intended to protect the functionality of the device, in
cases of temperature rise.
Indicator sensors
– four temperature sensors monitor the local temperature in the device. Their average is also
calculated by the PD64012. All values are stored in internal registers for data retrieval. The register values are
calculated by:
Decimal value = 684 - 1.514 x [(T
junc
)+ 40
°
C].
www.powerdsine.com
06-0003-058 (Rev. 2.8) / 5 August 2004
PowerDsine 2003
Information in this document subject
to change without prior notice.
5
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