Maxim-integrated MAX6876 Power-Supply Tracker/Sequencer Manuel d'utilisateur télécharger pdf (Page 1)

Maxim > Design Support > Technical Documents > User Guides > APP 3917

Keywords: sequencer, sequencing, monitor, eeprom, tracking,

USER GUIDE 3917

The MAX6876 Power-Supply Tracker/Sequencer User

Guide

By: Eric Schlaepfer, Applications Engineer

Sep 20, 2006

Abstract: This application note provides a step-by-step tutorial for configuring the MAX6876. The tutorial

describes how to set thresholds, timing delays, current measurements, and sequencing/tracking order.

Overview of the MAX6876's Key Features

Tracks and sequences up to four voltages

Closed-loop tracking control with programmable slew rate

Mixed tracking and sequencing

I²C programmable

Overcurrent sensing

Separate power-good (PG) outputs

Introduction

The MAX6876 tracks and sequences up to four voltages using parameters programmed over I²C and stored in

the internal EEPROM; these parameters include voltage thresholds, slew rates, timing delays, and the

sequencing order. The parameters are set within the user-friendly MAX6876 Evaluation Kit software. The part

may be programmed in-circuit using four wires: V

, SDA, SCL, and GND. In-circuit programming makes

experimentation during prototyping very easy since no resistors or capacitors need to be replaced to change the

thresholds or timing delays. In this circuit, power during normal operation comes from IN1 (the highest of the

input voltages), and power during programming comes from V

. This configuration allows the main DC-DC

power supplies on the board to remain off during programming.

Several passive components are required for operation. The ABP connection needs to be connected to a 1µF

ceramic capacitor to filter the internal power supply. All of the status outputs are open drain and, accordingly,

require pullup resistors. These resistors can be connected to any power-supply voltage under +6V. To filter

noise on the IN_ connections, 0.1µF capacitors can be connected, but they are not absolutely necessary.

Figure 1 illustrates the basic connections and key features of the MAX6876.

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Page 1 - Introduction

Maxim > Design Support > Technical Documents > User Guides > APP 3917Keywords: sequencer, sequencing, monitor, eeprom, tracking, USER GUID

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Figure 1. A diagram of the MAX6876's basic connections.To create a basic design with the MAX6876, use the following steps:1. Download and instal

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>Connect from the menu, and choose OK.5. To enable a channel, click the checkbox in the upper left corner of each channel window; next, set theund

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Figure 4. This screen capture illustrates how to configure the MAX6876 for mixed-modetracking/sequencing.7. Consult Table 1 and select the appropriat

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8. To set the slew rate, click the Slew Rate selection on the upper left portion of the screen.9. Set the power-up delay by clicking Power-Up Delay

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assert the OC output.13. The Reset Timer setting determines the RESET pulse width. Set the Reset Timer to a value that isguaranteed to reset the micr

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