Rainbow-electronics MAX5945 Manual de usuario descargar pdf (Pagina 3)

MAX5945

Quad Network Power Controller

for Power-Over-LAN

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(AGND = +32V to +60V, V

= 0V, V

to DGND = +3.3V, all voltages are referenced to V

, unless otherwise noted. Typical

values are at AGND = +48V, DGND = +48V, V

= (DGND + 3.3V), T

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

negative otherwise.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Minimum Foldback Current-

Limit Threshold

TH_FB

OUT_

= V

AGND

64 mV

SENSE_ Input Bias Current V

SENSE_

= V

-2 µA

SUPPLY MONITORS

Undervoltage Lockout V

EEUVLO

AGND

- V

, (V

AGND

- V

) increasing 27 28.5 30 V

Undervoltage-Lockout

Hysteresis

EEUVLOH

Overvoltage V

EE_OV

AGND

- V

)

> V

EE_OV

, V

AGND

increasing 61 62.5 64 V

Overvoltage Hysteresis V

OVH

Undervoltage V

EE_UV

AGND

- V

) < V

EE_UV

, V

AGND

decreasing 39 40 41 V

Overvoltage V

DD_OV

- V

DGND

)

> V

DD_OV

, V

increasing 3.57 3.71 3.90 V

Undervoltage V

DD_UV

- V

DGND

) < V

DD_UV

, V

decreasing 2.55 2.82 2.97 V

Undervoltage Lockout V

DDUVLO

Device operates when (V

- V

DGND

) >

DDUVLO

, V

increasing

1.7 V

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

+150 °C

Thermal-Shutdown Hysteresis T

SHDH

20 °C

OUTPUT MONITOR

OUT_ Input Current I

BOUT

OUT

= V

AGND

, all modes 2 µA

Idle Pullup Current at OUT_ I

DIS

OUT_ discharge current, detection and

classification off, port shutdown,

OUT_

= V

AGND

- 2.8V

200 260 µA

PGOOD High Threshold PG

OUT_

- V

, OUT_ decreasing 1.8 2.0 2.2 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

24ms

LOAD DISCONNECT

DC Load Disconnect

Threshold

DCTH

Minimum V

SENSE

allowed before disconnect (DC

disconnect active), V

OUT_

= V

345mV

1 2 3 4 5 6 7 8 ... 43 44

Quad Network Power Controller 1

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Rainbow-electronics MAX5945 Manual de usuario Pagina 3

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