MCP1630-ESLASHMS datasheet(16/26 Pages) MICROCHIP

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MCP1630/MCP1630V

DS21896B-page 16

5.0

APPLICATION

CIRCUITS/ISSUES

5.1

Typical Applications

The MCP1630/V high-speed PWM can be used for any

circuit topology and power-train application when

combined with a microcontroller. Intelligent, cost-

effective power systems can be developed for applica-

tions that require multiple outputs, multiple phases,

adjustable

outputs,

temperature

monitoring

and

calibration.

5.2

NiMH Battery Charger Application

A typical NiMH battery charger application is shown in

the “Typical Application Circuit – MCP1630” of this

data sheet. In that example, a Single-Ended Primary

Inductive Converter (SEPIC) is used to provide a

constant charge current to the series-connected

batteries. The MCP1630 is used to regulate the charge

current by monitoring the current through the battery

sense resistor and providing the proper pulse width.

The PIC16F818 monitors the battery voltage to provide

a termination to the charge current. Additional features

(trickle charge, fast charge, overvoltage protection,

etc.) can be added to the system using the programma-

bility of the microcontroller and the flexibility of the

MCP1630.

5.3

Bidirectional Power Converter

A bidirectional Li-Ion charger/buck regulator is shown

in the “Typical Application Circuit” of the this data

sheet. In this example, a synchronous, bidirectional

power

converter

example

shown

using

the

MCP1630V. In this application, when the ac-dc input

power is present, the bidirectional power converter is

used to charge 4-series Li-Ion batteries by boosting the

input voltage. When ac-dc power is removed, the

bidirectional power converter bucks the battery voltage

down to provide a dc bus for system power. By using

this method, a single power train is capable of charging

4-series cell Li-Ion batteries and efficiently converting

the battery voltage down to a low, usable voltage.

5.4

Multiple Output Converters

By using additional MCP1630 devices, multiple output

converters can be developed using a single MCU. If a

two-output converter is desired, the MCU can provide

two PWM outputs that are phased 180° apart. This will

reduce the input ripple current to the source and

eliminate beat frequencies.

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