onsemi NCP81428 User Manual

NCP81428 + NCP81418 Evaluation Board User's
Manual
EVBUM2928/D
This user manual is intended to assist those using the
NCP81428 + NCP81418 Evaluation Board. It will provide
useful tips and procedures for powering up and using the
Evaluation Board (EVB). It is intended as a quick-start guide
rather than a comprehensive manual.
Description
The NCP81428 + NCP81418 Evaluation Board is a test
vehicle for the PMBus-compatible NCP81428 and Slave
only NCP81418 Smart Fuses in a dual phase design. The
printed circuit board assembly (PCBA) contains all the
circuitry and connections necessary to evaluate the
performance of the NCP81428 + NCP81418 under various
load and system conditions, including PMBus operation.
Features
Power Features

Up to 160 A Peak Output Current, 100 A Continuous

V Operating Range: 4.5 to 18 V
IN

Up to 30 V Standby (PowerFet Off) Operation

0.65 mW Smart Fuse R
ds on
Control Features

Enabled by Pin Assertion and/or Through PMBus

Output Pulldown Selection Via PMBus

External Soft-Start Programming

Programmable VIN Under Voltage Warning and Over
Voltage Fault

3 OCPs with Programmable Levels and Timers

Soft Start Current Balancing Between Parallel Units

Co-packaged Power Switch, Hotswap Controller and
NVM

(TWI) Two Wire Interface between Master and Slave(s)
 Semiconductor Components Industries, LLC, 2025
April, 2025 − Rev. 1
EVAL BOARD USER'S MANUAL

PMBus 1.4 Compliant for Telemetry

10-bit ADC for IOUT, VIN, IOUT_PK, VOUT, VTEMP

Parallel Operation for High Current Applications

Excellent Current Balancing in Parallel Operations

Over-temperature Shutdown

FAULT#_C& FAULT#_D Multi-purpose Pins

Internal FET Health Diagnostics

Excessive Soft-start Duration Protection

Fault Event and Peak Current Recording

Programmable Auto Retry/Latch Off Options

5 mm x 5 mm QFN32 Package

Operating Temperature: −40 C to 125 C
Quick Start Connection Guide
1. Connect the power supplies to the connectors shown
in the table below.
T5, T6
T2, T4
2. Enable the device through the Enable Switch (SW1)
3. PMBus interface:
a. Connect the PMBus Interface Module with the
NCP81428 EVB through the I2C Interface
Header JP1, as shown in Figure 2.
4. Start up the GUI application. If not installed, install
GUI with setup.exe, which is located in the 'Full
Installer' folder of the GUI file provided.
5. Connect the external load either or both pairs of
screw terminals (T1/T3 and T5/T6). Leave the load
disconnected or OFF until the board has been
powered up successfully.
1
www.onsemi.com
Input Power Ground
Input Power: 4.5 V to 18 V (12 V typ.)
Publication Order Number:
EVBUM2928/D