Active-semi ACT4910EVK1-121 Manual del usuario - Página 4

Navegue en línea o descargue pdf Manual del usuario para Microcontroladores Active-semi ACT4910EVK1-121. Active-semi ACT4910EVK1-121 16 páginas.

UG-106

Rev 1.0, 16-November-2017

Jumpers and Connectors

J1 – Input voltage to the EVK.

J2 – Output power from the EVK. This is the system load.

J3 – Additional storage capacitor connector. This connector allows additional storage capacitors to be easily

added for evaluation

J4 – I2C connector. Connect to the Active Semi USB-TO-GPIO dongle or to any other I2C communication

device.

J5 – PLI output. This allows easy access the PLI or PG_STR pin.

J6 – I2C pullup voltage source. Place a shorting jumper across J6 to pullup the I2C lines to the IC REF

voltage. An external voltage may be applied to J6-2 if desired.

J7 – eFuse Rdson measurement. This connector provides easy to access Kelvin connections to measure the

eFuse Rdson. Do not use J7 to apply power to the EVK or as an output connector for the load.

EVK Operation

Turn on

The EVK is preconfigured and ready to use. Apply the 12V input voltage and the EVK automatically powers,

charges the storage capacitors, and delivers power to the load. No modifications are needed to start evaluating

the ACT4910's many functions such as supplement mode, ADC measurements, current limiting, etc.

Modifications

The EVK is designed to allow the user to immediately start evaluating the ACT4910 functionality. After the user

becomes familiar with the EVK functionality and has verified that they can reproduce the performance data, they

can easily modify the EVK to match their specific system level requirements. Refer to the ACT4910 datasheet

for detailed design equations.

PLI vs PG_STR Functionality

The ACT4910 default setting for pin 2 is for the PLI functionality. If the user changes this functionality to the

PG_STR function, populate R8 with a 2.2kohm resistor to enable LED1 to turn on when PG_STR goes low.

Input Snubber

The EVK contains a non-populated input snubber. If testing with long, inductive cables, populating the snubber

with the appropriate values will reduce overshoot when the input is hot plugged. 1nF and 10Ω are good starting

points.

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