Rainbow-electronics MAX4995 Manual do Utilizador descarregar pdf (Página 3)

MAX4995A/AF/AL/MAX4995B/MAX4995C

50mA to 600mA Programmable

Current-Limit Switches

_______________________________________________________________________________________ 3

Note 3: I

LIM

is forward current limit.

Note 4: Turn-on time and turn-off time are defined as the difference in the time between when the output crosses 10% and 90%

of the final output voltage.

Note 5: 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

I (mA)

R(k 2.48k

LIM

SETI

9042( )

)()

ΩΩ

ELECTRICAL CHARACTERISTICS (continued)

= +1.7V to +5.5V, R

SETI

= 94.3kΩ, C

= 1µF, and T

= T

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

= +3.3V,

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

DYNAMIC

Turn-On Time t

= 3.3V, C

OUT

= 1µF, R

= 20Ω, Figure 1,

(Note 4)

120

µs

Turn-Off Time t

OFF

S w i tch fr om on to off, V

I N

= 3.3V , C

OU T

= 1µF,

= 20Ω, Figure 1 (Note 4)

120

µs

MAX4995A/AL/B/C

Current-Limit Reaction Time t

LIM

= 3.3V, R

SETI

578kΩ, output high

and then short-circuit

applied

MAX4995AF 1.5

µs

Blanking Time

BLANK

(Note 5) 10

16.3 22.6

Retry Time

RETRY

M AX 4995A/M AX 4995AF/M AX 4995AL ( N ote 5) 320 723.2

THERMAL PROTECTION

Thermal Shutdown

+150

°C

Thermal-Shutdown Hysteresis 15 °C

10%

90%

10%

90%

OFF

OUT

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

) and Turn-Off Time (t

OFF

1 2 3 4 5 6 7 8 ... 11 12

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