Microchip LX7714 Manual

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LX7714 Evaluation Board User's Manual

Introduction

The LX7714 is a quad 14V to 46V power switch with line protection that is radiation-hardened by design and is used for

spacecraft power distribution. It provides a means to turn on and off four independent DC loads with continuous currents

up to 2.5A. Power switch sections can be paralleled to increase load current capability. The internal power switches use

slew limiting when turning on and off to manage switch on into capacitive loads, and manage switch off to inductive loads.

A power switch automatically opens the circuit in the event of an overload condition. Overload triggering is a function of

fault current over time; more severe fault conditions cause the switch to open faster. Each power switch has an individual

differential On/Off control input pair which directly interfaces to single-ended logic or an RS-422 type bus. Power switches

default to the on state with open-circuit control inputs.

Kit Contents

• LX7714 evaluation board

• FP-20+8×3-2_54-01Q-01c ZIF socket

• XSD1705-008 heatsink 37 x 37 x 12.5mm plus 6x C9161 plastic sprung rivets 3 x 12.5mm (2 for heatsink, 4 spares)

• T62 thermal pad 37 x 37mm for heatsink

Ordering Information

Product Order Number

LX7714 Evaluation Board LX7714-EVB

Figure 1. LX7714 Evaluation Board

Preliminary

LX7714 Evaluation Board User's Manual

LX7714 Evaluation Board Overview

1 LX7714 Evaluation Board Overview

The LX7714 evaluation board (EVB) does not include an LX7714 part. For general purpose evaluation, order an LX7714-

25MFB-ES to evaluate the quad 2.5A version, or an LX7714-12MFB-ES to evaluate the quad 1.25A version.

When fitting an LX7714 part, the im fitted upside down with pin 1 at the bottom left. The EVB portant point is that it is

architecture provides two alternative methods for fitting LX7714 devices:

• Fit the ZIF socket supplied with the EVB, allowing LX7714 parts to be interchanged quickly and reliably

 Forced air cooling will need to be provided when switching higher current loads

• Directly solder a LX7714 part to the board

 Fit the included heatsink and thermal pad (or alternative thermal management) when switching higher current

loads. The heatsink mounts on the top side of the EVB (onto the LX7714 package base) using two spring-loaded

plastic rivets. To remove the heatsink, squeeze each rivet's barb to release it from the PCB hole. Extra rivets are

included as they are easy to damage

The LX7714 EVB supports the following evaluation scenarios:

• Configuration of the LX7714's 4 sections as independent or paralleled blocks

 Independent power switch sections are galvanically isolated, and do not share power or ground rails unless wired

that way externally

• Power switch on/off control is provided by on-board switches for manual control, and/or by remote signals

 Plug-in configuration boards allow a single on-board switch to manually control multiple power switches together

• Optional status LEDs on the open-drain PWR_GOOD_x and IN_RESET_x outputs, which can be switched out to

allow the status outputs to be pulled up to alternate supplies

2 Independent Power Switch Sections

Since each power switch section is independent and galvanically isolated, they can be operated with different GND and/or

LINE input potentials. The EVB provides each of the 4 power switch sections with an individual ~5-6V voltage regulator

powered by the section's 14V to V rails are used to generate local control signals and to 46V LINE input supply. The ~5-6

operate the status LEDs.. Each regulator input is protected again LINE voltage fluctuations and possible high dV/dt rise

times by a series diode and resistor. Regulator outputs are protected against inadvertent overloads by series resistors,

and draw about 1mA from each LINE per lit LED.

Each power switch section has its own pair of 4mm LINE and GND input sockets on the left, and 4mm LOAD and GND

output sockets on the right. The GND connections are straight through, so a load output can be connected directly to the

LOAD and GND output sockets (4-wire connection) if convenient. Alternatively, the high current wiring from supply GND

to load GND can run external to the EVB. In this case, a single (low current) GND wire to either the input or the output

GND socket is also required to provide the supply GND reference to the power switch.

Cautionary Note: The LOAD A and GND A outputs are in reverse order compared with the other power connections.

2.1 LINE and GND Power Input Switches, LOAD Power Output Switches

Three power slide switches on the left side of the board connect or isolate the LINE and GND power inputs between

sections. Three power slide switches on the right side of the board connect or isolate the LOAD power outputs between

sections. The 4 GND connectors on the left route to the 4 GND connectors on the right, so power switching can be

through the board (4-wire) or 3-wire, where just one of the GND sockets is wired up to provide the necessary GND

reference for the LX7714.

Switch positions select between one permutation of the five combinations for paralleling power switch sections (Table 1

on page 3). The switches serve to connect LINE and GND between power switch sections, but don't disconnect

connections from the 4mm LINE and GND input sockets.

2.2 Operating The LX7714 As Four Independent Power Switches

Follow the first row in Table 1 on page 3 to configure four independent and galvanically isolated power switches. Set the 3

LINE and GND switches to their leftmost positions and the 3 LOAD switches to their rightmost positions, marked 'x is

independent'. If the LX7714 evaluation board is used to switch upplies, be aware that an several different LINE input s

inadvertent change of these switch positions can short external rails together.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	LX7714

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