Rainbow-electronics MAX835 Bedienungsanleitung PDF herunterladen (Seite 7)

MAX834/MAX835

Micropower, Latching Voltage Monitors

in SOT23-5

_______________________________________________________________________________________ 7

Monitoring Voltages Other than V

The typical operating circuit for the MAX834/MAX835

monitors V

. Voltages other than V

can easily be

monitored, as shown in Figure 4. Calculate V

TRIP

in the section

Programming the Trip Voltage.

When

monitoring voltages other than V

, ensure that the

maximum value for V

MON

is not exceeded:

MON

(MAX)

= (V

- 1)(R1 + R2) / R2

Load-Disconnect Switch

The circuit in Figure 5 is designed to prevent a lead-

acid battery or a secondary battery such as an NiCd,

from sustaining damage through deep discharge. As

the battery reaches critical undervoltage, OUT switches

low. Q1 and Q2 turn off, disconnecting the battery from

the load. The MAX835’s latched output prevents Q1 and

Q2 from turning on again as the battery voltage relaxes

to its open-circuit voltage when the load disconnects.

CLEAR can be connected to a pushbutton switch, an

RC network, or a logic gate to reset the latch when the

battery is recharged or replaced.

CLEAR 

LATCH

OUT

MON

0.1µF

OUT

CLEAR

GND

MAX834

MAX835

TRIP

= (1.204)

(UNITS ARE OHMS AND VOLTS)

MAX834 ONLY

R1 + R2

Figure 4. Monitoring Voltages Other than V

CLEAR

LATCH

LOAD

BATT

OUT

CLEAR

GND

Q2

MAX835

0.1µF

Figure 5. Load-Disconnect Switch

TRANSISTOR COUNT: 74

___________________Chip Information

1 2 3 4 5 6 7 8

MAX834/MAX835 1

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