Rainbow-electronics MAX4981 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX4978–MAX4981

Overvoltage Protector with

Active Current Limit

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ELECTRICAL CHARACTERISTICS (continued)

= 5.0V, V

= 0V, T

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

= +25°C.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Thermal-Shutdown Hysteresis 10 °C

EN Input High Voltage V

1.5 V

EN Input Low Voltage V

0.6 V

EN Input Leakage Current I

LKGE

= 5.5V or 0V -1 +1 µA

SDT Output Low Voltage V

MAX4978/MAX4979, I

SINK

= 20mA 1 V

SDT Leakage Current I

LKGS

MAX4978/MAX4979, V

SDT

= 28V, SDT

deasserted

1µA

DYNAMIC (Note 3)

IN Debounce Time t

DEB

UVLO

< V

OVLO

to charge-pump

enable, Figure 1

120 160 200 ms

Switch Turn-On Time t

Time from V

OUT

= 10% of V

to V

OUT

= 90%

of V

, R

= 10Ω, C

= 10µF

1.5 ms

Switch Turn-Off Time t

OFF

< V

UVLO

or V

> V

OVLO

to internal

switch off, R

= 1kΩ

515µs

Current-Limit Blanking Time t

BLANK

Short circuit applied, Figure 1 15 20 25 ms

Current-Limit Reaction Time t

REAC

Short circuit applied 5 µs

Overcurrent Autoretry Time t

RETRY

Figure 1 120 160 200 ms

Note 2: All devices are 100% production tested at T

= +25°C. Specifications over -40°C to +85°C are guaranteed by design.

Note 3: All timing is measured using 10% and 90% levels, unless otherwise noted.

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