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參數資料
| 型號： | MAX5969DETE+T |
| 廠商： | Maxim Integrated |
| 文件頁數： | 11/16頁 |
| 文件大小： | 1236K |
| 描述： | IC CTRLR INTERFCE W/MOSFT 16TQFN |
| 標準包裝： | 2,500 |
| 類型： | 以太網供電控制器 PD 開關（PoE） |
| 應用： | 遠程外設（工業控制，相機，數據訪問） |
| 內部開關： | 是 |
| 電流限制： | 720mA 至 880mA |
| 電源電壓： | 60V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WQFN 裸露焊盤 |
| 供應商設備封裝： | 16-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
IEEE 802.3af/at-Compliant, Powered Device Interface
Controller with Integrated Power MOSFET
______________________________________________________________________________________ 11
Detailed Description
Operating Modes
Depending on the input voltage (V
IN
= V
DD
- V
SS
), the
MAX5969D operates in four different modes: PD detec-
tion, PD classification, mark event, and PD power. The
device enters PD detection mode when the input voltage
is between 1.4V and 10.1V. The device enters PD clas-
sification mode when the input voltage is between 12.6V
and 20V. The device enters PD power mode once the
input voltage exceeds V
ON
.
Detection Mode (1.4V d V
IN
d 10.1V)
In detection mode, the power source equipment (PSE)
applies two voltages on V
IN
in the 1.4V to 10.1V range
(1V step minimum) and then records the current measure-
ments at the two points. The PSE then computes DV/DI
to ensure the presence of the 24.9k?signature resistor.
Connect the signature resistor (R
DET
) from V
DD
to DET for
proper signature detection. The MAX5969D pulls DET low
in detection mode. DET goes high impedance when the
input voltage exceeds 12.5V. In detection mode, most of
the MAX5969D internal circuitry is off and the offset cur-
rent is less than 10礎.
If the voltage applied to the PD is reversed, install pro-
tection diodes at the input terminal to prevent internal
damage to the MAX5969D (see the Typical Application
Circuit). Since the PSE uses a slope technique (DV/DI) to
calculate the signature resistance, the DC offset due to
the protection diodes is subtracted and does not affect
the detection process.
Classification Mode (12.6V d V
IN
d 20V)
In the classification mode, the PSE classifies the PD based
on the power consumption required by the PD. This allows
the PSE to efficiently manage power distribution. Class
05 is defined as shown in Table 1. (The IEEE 802.3af/at
standard defines only Class 04 and Class 5 for any spe-
cial requirement.) An external resistor (R
CLS
) connected
from CLS to V
SS
sets the classification current.
The PSE determines the class of a PD by applying
a voltage at the PD input and measuring the current
sourced out of the PSE. When the PSE applies a volt-
age between 12.6V and 20V, the MAX5969D exhibits a
current characteristic with a value shown in Table 1. The
PSE uses the classification current information to classify
the power requirement of the PD. The classification cur-
rent includes the current drawn by R
CLS
and the supply
current of the MAX5969D so the total current drawn by
the PD is within the IEEE 802.3af/at standard figures. The
classification current is turned off whenever the device is
in power mode.
2-Event Classification and Detection
During 2-event classification, a Type 2 PSE probes PD
for classification twice. In the first classification event, the
PSE presents an input voltage between 12.6V and 20.5V
and the MAX5969D presents the programmed load
I
CLASS
. The PSE then drops the probing voltage below
the mark event threshold of 10.1V and the MAX5969D
presents the mark current (I
MARK
). This sequence is
repeated one more time.
When the MAX5969D is powered by a Type 2 PSE, the
2-event identification output 2EC asserts low after the
internal isolation n-channel MOSFET is fully turned on.
2EC current sink is turned off when V
DD
goes below the
UVLO threshold (V
OFF
) and turns on when V
DD
goes
above the UVLO threshold (V
ON
), unless V
DD
goes
below V
THR
to reset the latched output of the Type 2 PSE
detection flag.
Table 1. Setting Classification Current
*V
IN
is measured across the MAX5969D input V
DD
to V
SS
.
CLASS
MAXIMUM
POWER USED
BY PD
(W)
R
CLS
(I)
V
IN
*
(V)
CLASS CURRENT SEEN AT
V
IN
(mA)
IEEE 802.3at PD
CLASSIFICATION CURRENT
SPECIFICATION (mA)
MIN
MAX
MIN
MAX
0
0.44 to 12.95
615
12.6 to 20
0
4
0
5
1
0.44 to 3.94
117
12.6 to 20
9
12
8
13
2
3.84 to 6.49
66.5
12.6 to 20
17
20
16
21
3
6.49 to 12.95
43.7
12.6 to 20
26
30
25
31
4
12.95 to 25.5
30.9
12.6 to 20
36
44
35
45
5
> 25.5
21.3
12.6 to 20
54
64
51
68
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