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dc1674aafb

DEMO MANUAL DC1674A-A

QUICK START PROCEDURE

1. Ensure that JP1 and JP2 are in their default positions,

as shown in Figure 1. Set PS3 to 3.6V and turn on. The

DC590B board to one of the following settings: 3.3V,

5V, removed for 2.7V or set to external if an external

2. Start the Linear Technology QuickEval™ program.

Download and install the latest version of the QuikEval

programfromthefollowingweblink:http://www.linear.

com/designtools/software/. This program should au-

tomatically detect the presence of the LTC4155EUFD

demoboard(DC1674A-A)andactivatetheappropriate

GUI, as seen in Figure 3.

3. Set PS1 to 5V, and turn on. The “WALL Input Power

Available”and“ExternalPowerAvailable”indicatorson

the GUI should turn green. The current on PS1 should

indicate approximately 80mA.

sense resistance of IM1, adjust PS3 such that VM3

reads 3.6V. PS1 should now read approximately 2A,

and IM1 should read approximately 2.4A.

5. Set PS2 to 5V, and turn on. The only change should

be the “USB Input Power Available” indicator should

turn green.

radio button in the “Input Power Priority” frame. PS1

should now read 0A, PS2 should read approximately

2A, and IM1 should be unchanged at 2.4A

7. Set LD1 to 1A, and turn on. PS2 should now read ap-

proximately 3A, and IM1 should be unchanged.

proximately 2A, and IM1 should be 1.2A.

9. Turn off and disconnect PS1, VM1, and PS2.

10. Select the “Force OTG Boost On” radio button. VM2

should now read approximately 5V.

USING THE LTC4155EUFD SOFTWARE

Introduction

The DC1674A-A GUI provides control of most aspects

of operation of the LTC4155EUFD. The DC1674A-A GUI

continuously reads back the LTC4155EUFD registers and

updates the displayed status accordingly. The DC1674A-A

GUI also provides a means to change the value of the

CLPROGx and PROG resistors, as well as the b of the NTC

device. The user is responsible for ensuring that these

values match the values on the physical Demo Board.

The DC1674A-A GUI will remember these values from

session to session, and they can be reset to the default

values at any time.

The DC1674A-A GUI is composed of three forms, the

LTC4155 form (Figure 3) that is brought up by the Quick-

Eval program, the Manage Current Limit Resistors form

(Figure 4), that is brought up by pressing the “Change

Resistors” button on the LTC4155 form, and the Manage

b Value form (Figure 5) that is brought up by pressing the

“Change b” button on the LTC4155 form.

Any changes made in the Manage Current Limit Resistors

orManagebValueformswillbereflectedonthemainform

as soon as “Apply” is pressed. All changes made in these

two forms will be remembered from session to session.

The values can be set to default at any time.

View LTC4155EUFD Product Page

This button opens your default internet browser, and

searches the Linear Technology Corporation web site for

information on the LTC4155EUFD when an internet con-

nection is available.

These sections allow control over the WALL and USB

input current limit.

These sections should default to 100mA at power-up,

when the USB/USER (JP1) is in the “USB” position. They