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| 型号： | MAX5965BUAX+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | High-Power, Quad, Monolithic, PSE Controllers for Power over Ethernet; Package: SSOP;36 pin;163 mm² ; Temperature: 0°C to +85°C |
| 中文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封装： | ROHS COMPLIANT, SSOP-36 |
| 文件页数： | 15/54页 |
| 文件大小： | 1525K |
| 代理商： | MAX5965BUAX+ |
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MAX5965A/MAX5965B
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
22
______________________________________________________________________________________
Table 3. Automatic ICUT Programming
CL_DISC
PORT
CLASSIFICATION
RESULT
ENx_CL6 EN_HP_ALL EN_HP_CL6
EN_HP_CL5
EN_HP_CL4
RESULTING ICUT
REGISTER BITS
0
Any
X
User programmed
1
X
ICUT = 110
1
2
X
ICUT = 111
1
0, 3
X
ICUT = 000
1
4, 5
X
0
X
ICUT = 000
1
5
X
1
X
1
X
ICUT = R24h[6:4]
1
5
X
1
X
0
X
ICUT = 000
1
4
X
1
X
x
1
ICUT = R24h[6:4]
1
4
X
1
X
0
ICUT = 000
1
6 or Illegal
0
X
—
1
6 or Illegal
1
X
(See Table 35a)
1
6 or Illegal
1
0
X
ICUT = 000
1
6 or Illegal
1
0
X
ICUT = 000
MOSFET Gate Driver
Connect the gate of the external n-channel MOSFET to
GATE_. An internal 50A current source pulls GATE_ to
(VEE + 10V) to turn on the MOSFET. An internal 40A
current source pulls down GATE_ to VEE to turn off the
MOSFET.
The pullup and pulldown current controls the maximum
slew rate at the output during turn-on or turn-off. Use
the following equation to set the maximum slew rate:
where CGD is the total capacitance between GATE and
DRAIN of the external MOSFET. Current limit and the
capacitive load at the drain control the slew rate during
startup.
During
current-limit
regulation,
the
MAX5965A/MAX5965B manipulate the GATE_ voltage
to control the voltage at SENSE_ (VRS). A fast pulldown
activates if VRS overshoots the limit threshold
(VSU_LIM). The fast pulldown current increases with the
amount of overshoot. The maximum fast pulldown cur-
rent is 100mA.
During turn-off, when the GATE_ voltage reaches a
value lower than 1.2V, a strong pulldown switch is acti-
vated to keep the MOSFET securely off.
V
t
I
C
OUT
GATE
GD
=
Figure 3a. Foldback Current Characteristics
48V
28V
VSU_LIM
VSU_LIM / 3
(VRS - VEE)
(VOUT_ - VEE)
Figure 3b. Foldback Current Characteristics for High-Power Mode
48V
10V
VSU_LIM
VTH_FB
(VRS - VEE)
(VOUT_ - VEE)
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| MAX5965BUAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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