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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： | 30/54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
36
______________________________________________________________________________________
Table 20a. Timing Configuration Register
ADDRESS = 16h
SYMBOL
BIT
R/W
DESCRIPTION
RSTR[1]
7
R/W
Restart timer programming bit 1
RSTR[0]
6
R/W
Restart timer programming bit 0
TSTART[1]
5
R/W
Startup timer programming bit 1
TSTART[0]
4
R/W
Startup timer programming bit 0
TFAULT[1]
3
R/W
Overcurrent timer programming bit 1
TFAULT[0]
2
R/W
Overcurrent timer programming bit 0
TDISC[1]
1
R/W
Load disconnect timer programming bit 1
TDISC[0]
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
tDISC
tSTART
tFAULT
00
16 x tFAULT
tDISC nominal (350ms, typ)
tSTART nominal (60ms, typ)
tFAULT nominal (60ms, typ)
01
32 x tFAULT
1/4 x tDISC nominal
1/2 x tSTART nominal
1/2 x tFAULT nominal
10
64 x tFAULT
1/2 x tDISC nominal
2 x tSTART nominal
2 x tFAULT nominal
11
0 x tFAULT
2 x tDISC nominal
4 x tSTART nominal
4 x tFAULT 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 (tDISC).
Set the bits in R16h to scale the tSTART, tFAULT, and
tDISC 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.
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