Rainbow-electronics MAX14523C Instrukcja Użytkownika Pobierz pdf (Strona 3)

MAX14523A/MAX14523AL/MAX14523B/MAX14523C

250mA to 1.5A, Adjustable

Current-Limit Switches

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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

FLAG OUTPUT

FLAG Output Logic-Low Voltage I

SINK

= 1mA 0.4 V

FLAG Output Leakage Current V

= V

FLAG

= 5.5V, FLAG deasserted 1 μA

DYNAMIC

Turn-On Time t

Time from ENABLE signal to V

OUT

= 90%

of V

= 3.3V, Figure 1

1 ms

Turn-Off Time t

OFF

Time from DISABLE signal to V

OUT

= 10%

of V

= 3.3V, R

= 20, Figure 1

250 μs

Current-Limit Reaction Time t

LIM

= 3.3V, R

SETI

= 91.78k to 563.12k,

output high and then short-circuit applied

3 μs

Blanking Time t

BLANK

(Note 3) 10 14.5 25 ms

Retry Time t

RETRY

MAX14523A/MAX14523AL (Note 3) 320 875 ms

THERMAL PROTECTION

Thermal Shutdown Low-to-high +170 °C

Thermal Shutdown Hysteresis 15 °C

ELECTRICAL CHARACTERISTICS (continued)

= +1.7V to +5.5V, R

SETI

= 94.2kΩ, C

= C

OUT

= 1µF, and T

= T

= -40°C to +125°C, unless otherwise noted. Typical values

are at V

= +3.3V, T

= +25°C.) (Note 2)

Note 2: All devices are 100% tested at 125°C. Electrical limits across the full temperature range are guaranteed by design and correlation.

Note 3: Blanking time and retry time are generated by the same oscillator. Therefore, the ratio of is a constant value of 32.

See Figures 2 and 3.

RETRY

BLANK

OFF

OUT

10% V

90% V

ON(ON)*

*( ) THE POLARITY OF THE SIGNAL IS REVERSED FOR THE MAX14523AL ONLY.

Figure 1. Timing Diagram for Measuring Turn-On Time (t

) and Turn-Off Time (t

OFF

)

1 2 3 4 5 6 7 8 9 10

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