Rainbow-electronics MAX5965B Manual de usuario descargar pdf (Pagina 4)

MAX5965A/MAX5965B

High-Power, Quad, Monolithic, PSE Controllers

for Power over Ethernet

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

AGND

= 32V to 60V, V

= 0V, V

to V

DGND

= +3.3V, all voltages are referenced to V

, unless otherwise noted. Typical values are at

AGND

= +48V, V

DGND

= +48V, V

= (V

DGND

+ 3.3V), T

= +25°C. Currents are positive when entering the pin and negative other-

wise.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SUPPLY MONITORS

Undervoltage Lockout V

EEUVLO

AGND - V

, AGND - V

increasing 28.5 V

Undervoltage Lockout

Hysteresis

EEUVLOH

P or ts shut d ow n i f AGN D - V

E E

< V

U V L O

E E U V L OH

Overvoltage Lockout V

EE_OV

event bit sets and ports shut down if

AGND - V

> V

EE_OV

, AGND increasing

62.5 V

Overvoltage Lockout

Hysteresis

OVH

Undervoltage V

EE_UV

E E _ U V

event b i t i s set i f AGN D - V

E E

< V

E E _ U V

E E

i ncr easi ng

40 V

Overvoltage V

DD_OV

event bit is set if V

- V

DGND

DD_OV

; V

increasing

3.82 V

Undervoltage V

DD_UV

is set if V

- V

DGND

> V

DD_UV

, V

decreasing

2.7 V

Undervoltage Lockout V

DDUVLO

Device operates when V

- DGND >

DDUVLO

, V

increasing

Undervoltage Lockout

Hysteresis

DDHYS

120 mV

Thermal Shutdown Threshold T

SHD

Ports shut down and device resets if its

junction temperature exceeds this limit,

temperature increasing (Note 5)

+150 °C

Thermal Shutdown Hysteresis T

SHDH

Thermal hysteresis, temperature decreasing

(Note 5)

20 °C

OUTPUT MONITOR

OUT_ Input Current I

BOUT

OUT

= AGND, all modes 2 µA

Idle Pullup Current at OUT_ I

DIS

OUT_ discharge current, detection and

classification off, port shutdown,

OUT_

= AGND - 2.8V

200 265 µA

PGOOD High Threshold PG

OUT_

- V

, OUT_ decreasing 1.5 2.0 2.5 V

PGOOD Hysteresis PG

HYS

220 mV

PGOOD Low-to-High Glitch

Filter

PGOOD

Minimum time PGOOD has to be high to set

bit in register 10h

3ms

1 2 3 4 5 6 7 8 9 ... 51 52

MAX5965A/MAX5965B 1

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Rainbow-electronics MAX5965B Manual de usuario Pagina 4

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