MAX5922AEUI+【PDF 4/21 页】IC NETWORK PWR SW +48V 28-TSSOP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录43

1页 2页 3页 [4页]5页 6页 7页 8页

+48V, Single-Port Network Power Switch

For Power-Over-LAN

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= 48V, V

DIG

= 3.3V, AGND_S = AGND = DGND = 0V, R

SENSE

= 0.5& ?%, UVLO = open, EN = V

DIG

, R

RCL

= 150& ?%, R

RDT

= 18.2k& ?%, T

= -40癈 to +85癈, unless otherwise noted. Typical values are at T

= +25癈.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

PD DETECTION (See Figure 3, PD Detection Section)

Detection Probe Voltage Phase I

PBI

= 19k& to 26.5k&

3.6

4.4

Detection Probe Voltage Phase II

PBII

= 19k& to 26.5k&

7.2

8.8

Detection Short-Circuit Current

SC_DET

OUT shorted to AGND

0.68

1.50

Valid PD Detected Lower-Limit

Threshold

PDL

(Note 9)

Valid PD Detected Upper-Limit

Threshold

PDH

(Note 9)

26.5

33.0

Total Detection Time

det

170

196

Reject Capacitance During

Detection

PDH

= 19k& to 26.5k&

礔

Allowable Capacitance During

Detection

PDL

= 19k& to 26.5k&

0.6

礔

PD CLASSIFICATION (See PD Classification Mode Section)

OUT

= 0.5mA to 45mA

Classification Probe Voltage

CLASS

No load

Classification Short-Circuit

Current

SC_CLASS

Shorted to AGND

Classification Time Duration

CLASS

From detection completion

21.3

Total Detection and Classification

Delay Time

TOT

From channel-enabled to power delivered

at the OUT pin

191

230

Class 0 to Class 1 Threshold

CLASS_1L

5.5

6.5

7.5

Class 1 to Class 2 Threshold

CLASS_1-2

14.5

Class 2 to Class 3 Threshold

CLASS_2-3

Class 3 to Class 4 Threshold

CLASS_3-4

Default To Class 0 High-Current

Lower-Limit Threshold

CLASS_4-0

46.5

Collision Detection Delay Time

(MAX5922A/MAX5922C Only)

DCA

DCA = high, R

= 15k&

2.38

2.8

3.22

Note 1: All specifications are 100% production tested at T

= +25癈, unless otherwise noted. All temperature limits are guaranteed by

design.

Note 2: This is the time from an output overcurrent or short-circuit condition until the output goes into regulated current limit.

Note 3: OUT voltage above which the output current limit is at its full value (see Figure 8).

Note 4: To be consistent with the IEEE 802.3af standard, choose R

SENSE

= 0.5& ?%.

Note 5: This is the time the part stays in current-limit mode during overload condition. After t

elapses (or when the junction temperature

hits +150癈) the part shuts down.

Note 6: See the Typical Operating Characteristics and Figure 6.

Note 7: This is the delay from I

OUT

falling below the zero-current threshold until ZC goes low and the IC shuts down (see the Zero-Current

Detection section).

Note 8: See the Fault Management section.

Note 9: PD is detected by the procedures specified by the IEEE 802.3af standard. A probe voltage V

PBI

(+4V typically) is forced at OUT

and the current I

is measured after t

DET

/2. A second probe voltage V

PBII

(+8V typically) is then forced and I

measured after

DET

/ 2 again. The voltage increment is then divided by the difference of the two currents (I

- I

). This is the PD resistance value.

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式