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dc2423af

DEMO MANUAL DC2423A

OPERATING PRINCIPLES

OVERVIEW

The LTM9100 contains an isolated DC/DC converter, deliv-

transients can exist without affecting the operation of the

LTM9100. The logic side ON pin enables or shuts down

the LTM9100. The isolated side GATE pin and MOSFET

turn on are controlled by the logic side EN input. The logic

side also has two status pins, PG for power good and

ALERT to indicate an internal fault. LEDs indicate if either

pin has been activated.

All logic side signals are referenced to the logic supply

by jumper (JP2) selection.

The DC2423A is designed to be used either stand-alone

or interfaced directly with a DC590 isolated serial control-

may be used with either the DC590 or DC2026 (when

running the DC590 Arduino code). Example Arduino

code specifically for the DC2423A is also available for the

for communication to its isolated side control and status

functions,aswellasADCresults.Theisolatedsideincludes

The isolated side of the LTM9100 controls the turn-on of

an external MOSFET. The MOSFET leads are connected by

screw terminal block, and its body is screw mounted to

a heatsink and PCB. This allows the MOSFET to be easily

interchanged or replaced. The design can accommodate

TO-247 (default), TO-264, and TO-220 packages.

The demo board can be connected for either high side or

lowsideapplications.Bananajacksareprovidedandclearly

labeled for voltage input and load connection depending

on the selected configuration. The line monitor jumper

(JP7) must also be configured for the same configuration

so that the LTM9100 ADC reports the proper input voltage.

LEDs indicate the presence of line voltage in blue and load

voltage in yellow once the MOSFET has been turned on.

An optional capacitive load with banana connections has

been provided on the demo board. It may be used by

externally wiring to the proper load terminals.

Transient suppression is included to protect the MOSFET

and on board load capacitor for the –B version of the

external overvoltage/overcurrent protection in the event

the MOSFET shorts either drain to gate or drain to source,

protecting the LTM9100.

The DC2423A may be configured for other input voltages

and load currents by changing a handful of components.

The assembly table located on the demo board schematic

lists the component variations between the –A and –B

versions.

JUMPERS

DC2423A contains 7 jumpers, and a 14-pin connector

function configuration, a description of jumper follows.

JP1: EEPROM Program (PG) or Write Protect (WP). For

factory use only in programming the demo board ID for

QuickEval. Default position: Not Populated.

JP3: ON Jumper. Enables the LTM9100 in the ON (default)

position, and disables operation in the OFF position. The

ON terminal either monitors the state of the ON jumper,

or if the ON jumper is removed, allows the ON terminal

to be externally driven.

JP4:ENJumper.EnablestheLTM9100GATEpin,provided

both UV and OV functions are satisfied, in the ON (default)

position, and disables GATE in the OFF position. Operation

of the GATE pin may be subsequently controlled via the

EN terminal either monitors the state of the EN jumper,

or if the EN jumper is removed, allows the EN terminal to

be externally driven.