Rainbow-electronics MAX5943 Manual do Utilizador descarregar pdf (Página 3)

MAX5943

FireWire Current Limiter and Low-Drop

ORing Switch Controller

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= 7.5V to 37V, GND = 0V, and T

= -40°C to +85°C, unless otherwise noted. Typical values are at V

= 12V, T

= +25°C.)

(Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GATE2 Pulldown Current During

Any GATE2 Turn-Off Condition

G2OFF

GATE2

= V

OUT

+ 4.5V (Note 4) 80 125 200 mA

GATE1 (ORing control)

OR_ADJ = GND 3 5 7

OR_ADJ = floating 5.5 7.5 9.5

ORing Switch Turn-On Current

Threshold Voltage

- V

SENSE

) rising

OR_ADJ = IN 8.5 10.5 12.8

ORing Switch Turn-On Current

Threshold Voltage Hysteresis

SENSE

) falling 0.5 mV

GATE1 Pullup Current I

G1U

(Note 5) 36 45 54 µA

7.5V ≤ V

≤ 8V 4.25 5.5 6.5

GATE1 High Voltage V

GATE1

- V

SENSE

8V ≤ V

≤ 37V 4.5 5.5 6.5

GATE1 Turn-Off Switch On-

Resistance

Measured between GATE1 and SENSE

when (V

- V

SENSE

) < V

23Ω

LOGIC INPUTS

Current into or out of input for tri-state logic

condition

-3 +3

IXL

Current out of input for logic low 20

ILIM, OR_ADJ Input-Logic

Tristate Current Tolerance

(Note 6)

Current into input for logic high 20

µA

> V

ON_REF

0.7 V

LATCH, ONQ1 Input-Logic Low

Voltage

LATCH, ONQ1 = GND, V

> V

ON_REF

1µA

LATCH, ONQ1 Input-Logic High

Voltage

> V

ON_REF

1.8 V

LATCH, ONQ1 Input Current I

All voltages = V

, V

> V

ON_REF

1µA

TIM, ILIM, LATCH, OR_ADJ,

OUT, ONQ1 Shutdown Mode

Input Current

IH_SD

All voltages = V

, V

≤ 0.4V 1 µA

FAULT Output Low Voltage V

Low-impedance state, I

FAULT

= 5mA 0.12 0.25 V

FAULT Output High Leakage

Current

High-impedance state, V

FAULT

= 37V 1 µA

TIMING

TIM = IN 1.78 2.02 2.26 ms

TIM

= 4kΩ 0.87 1.04 1.21 ms

TIM

= 50kΩ 9.2 11.05 12.9 ms

Current-Limit Timeout

(MAX5943A)

ILIM

Current-limit mode

(Note 7)

TIM = floating 120 175 225 ms

1 2 3 4 5 6 7 8 ... 19 20

ORing Switch Controller 1

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