MCP1630 datasheet(12/18 Pages) MICROCHIP

12 / 18 page

MCP1630

DS21896A-page 12

 2004 Microchip Technology Inc.

5.0

APPLICATION CIRCUITS/

ISSUES

5.1

Typical Applications

The MCP1630 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” on page 3 of this

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

Inductive Converter (SEPIC) is used to provide a con-

stant 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

Multiple Output Converters

By using additional MCP1630 devices, multiple output

converters can be developed using a single microcon-

troller. If a two-output converter is desired, the micro-

controller 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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