Rainbow-electronics MAX4995 Bedienungsanleitung PDF herunterladen (Seite 8)

MAX4995A/AF/AL/MAX4995B/MAX4995C

50mA to 600mA Programmable

Current-Limit Switches

8 _______________________________________________________________________________________

continues beyond the blanking time. Reset the switch

by either toggling the control logic (ON) or cycling the

input voltage. If the thermal power rating of the pack-

age is exceeded during t

BLANK

, the MAX4995B goes

into thermal shutdown.

Continuous Current Limit (MAX4995C)

When the forward current reaches the forward current-

limit threshold, the MAX4995C limits the output current

to the programmed current limit. FLAG asserts if the

current limit is present for t

BLANK

and deasserts when

the overload condition is removed. In this mode, if the

thermal power rating of the package is exceeded, the

MAX4995C goes into thermal shutdown.

Switch-On/Off Control

The ON input for the MAX4995_/MAX4995AF and ON

input for the MAX4995AL control the switch; see Table

1. Toggle ON for the MAX4995B to reset the fault condi-

tion once the short current is detected and the device

shuts down.

Reverse-Current Protection

The MAX4995 features a reverse-current protection cir-

cuit that limits the backflow current to 10µA when the

output voltage exceeds the input voltage by 110mV

(typ). The switch turns off and FLAG asserts without

waiting for t

BLANK

to elapse. The switch turns back on

and FLAG deasserts when the output voltage drops

below the detecting threshold by 10mV (typ).

OUT

SETI

MAX4995A/MAX4995AF/

MAX4995AL/MAX4995B/

MAX4995C

CONTROL

LOGIC

REVERSE-

CURRENT

PROTECTION

THERMAL

SHUTDOWN

CURRENT

LIMIT

BANDGAP

REFERENCE

BUFFER

TIMING

CIRCUITRY

BUFFER

N.C.

FLAG

SOFT-START

ON (ON)*

UVLO

*( ) FOR THE MAX4995AL ONLY.

GND

Functional Diagram

MAX4995_/

MAX4995AF

MAX4995AL

ON ON

SWITCH

STATUS

0 1 Off

10On

Table 1. Switch Truth Table

1 2 3 4 5 6 7 8 9 10 11 12

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