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參數(shù)資料
| 型號： | DC917A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR LTC4267 |
| 設(shè)計資源： | DC917A Design Files DC917A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 電源管理，以太網(wǎng)供電（POE） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LTC4267 |
| 已供物品： | 板 |
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LTC4267
1
4267fc
Power over Ethernet
IEEE 802.3af PD Interface with
Integrated Switching Regulator
The LTC
4267 combines an IEEE 802.3af compliant Pow-
ered Device (PD) interface with a current mode switching
regulator, providing a complete power solution for PD
applications. The LTC4267 integrates the 25kΩ signature
resistor, classication current source, thermal overload pro-
tection, signature disable and power good signal along with
an undervoltage lockout optimized for use with the IEEE-
required diode bridge. The precision dual level input current
limit allows the LTC4267 to charge large load capacitors
and interface with legacy PoE systems.
The current mode switching regulator is designed for
driving a 6V rated N-channel MOSFET and features pro-
grammable slope compensation, soft-start, and constant
frequency operation, minimizing noise even with light
loads. The LTC4267 includes an onboard error amplier
and voltage reference allowing use in both isolated and
nonisolated congurations.
The LTC4267 is available in space saving, low prole
16-pin SSOP or DFN packages.
■
IP Phone Power Management
■
Wireless Access Points
■
Security Cameras
■
Power over Ethernet
■
Complete Power Interface Port for IEEE 802
.3af
Powered Device (PD)
■
Onboard 100V, 400mA UVLO Switch
■
Precision Dual Level Inrush Current Limit
■
Integrated Current Mode Switching Regulator
■
Onboard 25kΩ Signature Resistor with Disable
■
Programmable Classication Current (Class 0-4)
■
Thermal Overload Protection
■
Power Good Signal
■
Integrated Error Amplier and Voltage Reference
■
Low Prole 16-Pin SSOP and 3mm × 5mm DFN
Packages
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
Class 2 PD with 3.3V Isolated Power Supply
PVCC
PWRGD
NGATE
SENSE
ITH/RUN
VFB
PGND
POUT
VPORTP
RCLASS
SIGDISA
VPORTN
LTC4267
+
RCLASS
68.1
1%
5F
MIN
10k
470
100k
60.4k
PVCC
4.7F
320F
MIN
22nF
PA1133
PS2911
BAS516
TLV431
SBM1040
SMAJ58A
3.3V
1.5A
CHASSIS
HD01
+
–
+
–
HD01
–48V
FROM
DATA PAIR
–48V
FROM
SPARE PAIR
4267 TA01
Si3440
0.1
6.8k
10k
0.1F
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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