MAX5965AEAX+【PDF 36/54 页】IC PSE CTRLR FOR POE 36SSOP

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

32页 33页 34页 35页 [36页]37页 38页 39页 40页

High-Power, Quad, Monolithic, PSE Controllers

for Power over Ethernet

36 ______________________________________________________________________________________

Table 20a. Timing Configuration Register

ADDRESS = 16h

SYMBOL

BIT

R/W

DESCRIPTION

RSTR[1]

R/W

Restart timer programming bit 1

RSTR[0]

R/W

Restart timer programming bit 0

TSTART[1]

R/W

Startup timer programming bit 1

TSTART[0]

R/W

Startup timer programming bit 0

TFAULT[1]

R/W

Overcurrent timer programming bit 1

TFAULT[0]

R/W

Overcurrent timer programming bit 0

TDISC[1]

R/W

Load disconnect timer programming bit 1

TDISC[0]

R/W

Load disconnect timer programming bit 0

Table 20b. Startup, Fault, and Load Disconnect Timer Values for Timing Register

BIT [1:0]

(ADDRESS = 16h)

RSTR

DISC

START

FAULT

16 x t

FAULT

DISC

nominal (350ms, typ)

START

nominal (60ms, typ)

FAULT

nominal (60ms, typ)

32 x t

FAULT

x t

DISC

nominal

x t

START

nominal

x t

FAULT

nominal

64 x t

FAULT

x t

DISC

nominal

2 x t

START

nominal

2 x t

FAULT

nominal

0 x t

FAULT

2 x t

DISC

nominal

4 x t

START

nominal

4 x t

FAULT

nominal

TSTART[1,0] (Table 20a) programs the startup timers.

Startup time is the time the port is allowed to be in cur-

rent limit during startup. TFAULT[1,0] programs the

fault time. Fault time is the time allowed for the port to

be in current limit during normal operation. RSTR[1,0]

programs the discharge rate of the TFAULT_ counter

and effectively sets the time the port remains off after

an overcurrent fault. TDISC[1,0] programs the load dis-

connect detection time. The device turns off power to

the port if it fails to provide a minimum power mainte-

nance signal for longer than the load disconnect detec-

tion time (t

DISC

Set the bits in R16h to scale the t

START

, t

FAULT

, and

DISC

to a multiple of their nominal value specified in the

Electrical Characteristics table.

When the MAX5965A/MAX5965B shut down a port due

to an extended overcurrent condition (either during

startup or normal operation), if RSTR_EN is set high, the

part does not allow the port to power back on before

the restart timer (Table 20b) returns to zero. This effec-

tively sets a minimum duty cycle that protects the exter-

nal MOSFET from overheating during prolonged output

overcurrent conditions. A reset sets R16h = 00h.

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