ZXCT1010 데이터 시트보기 (PDF) - Zetex => Diodes

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ZXCT1010

Enhanced high-side current monitor

Zetex => Diodes 

Typical circuit application

Where RLOAD represents any load including DC

motors, a charging battery or further circuitry

that requires monitoring, RSENSE can be

selected on specific requirements of accuracy,

size and power rating.

ZXCT1010

Li-Ion charger circuit

The figure below shows the ZXCT1010 supporting the Benchmarq bq2954 charge management

IC. Most of the support components for the bq2954 are omitted for clarity. This design also uses

the Zetex FZT789A high current Super-␤ PNP as the switching transistor in the DC-DC step down

converter and the FMMT451 as the drive NPN for the FZT789A. The circuit can be configured to

charge up to four Li-Ion cells at a charge current of 1.25A. Charge can be terminated on maximum

voltage, selectable minimum current, or maximum time out. Switching frequency of the PWM

loop is approximately 120kHz.

Charger Input

FZT789A 140µH

0.2Ω

To Battery +

BC81725

1kΩ

ZHCS1000

Vin

Load

BAS16

100Ω

10µH

5V

+-

bq2954 MOD pin

FMMT451

220Ω

SNS pin

ZXCT1010

Iout

support components omitted for clarity

100Ω

Issue 9 - July 2006

6

© Zetex Semiconductors plc 2006

www.zetex.com

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