ACS704ELC-015 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

ACS704ELC-015

Fully Integrated, Hall Effect-Based Linear Current Sensor with Voltage Isolation and a Low-Resistance Current Conductor

Allegro MicroSystems 

ACS704ELC-015

The Effect of PCB Layout on ACS704 Electrical Performance

Eight different PC boards were fabricated to characterize the effect of PCB design on the operating junction temperature of the

Hall-effect IC inside of the ACS704. These PC boards are shown in the figure below.

2 oz. Cu on one side of board

2 oz. Cu on both sides of board

An ACS704 device was soldered onto each PC board before beginning the thermal testing. Thermal management tests

were conducted with the following test conditions:

Tests were conducted at ambient temperature, Ta = 20°C. All tests were conducted in still air.

14 gauge wires were used to connect a power supply to a single PC board. These wires carry the 15 A dc primary current during

the tests.

A 15 A dc primary current was applied to a single PC board containing an ACS704 device. This current flowed from pins 1 and 2

to pins 3 and 4 of the ACS704 package.

A 1 mA current was forced from the GND pin to the VCC pin by a Fluke 179 True RMS Multimeter. This was the only power

applied to pins 5-8 of the ACS704 package during testing.

The voltage required to force the 1 mA current from the GND pin to the VCC pin was measured after applying the 15 A primary

current for approximately 25 minutes. A graph similar to the graph below was used to determine the junction temperature of the

ACS704.

Voltage vs. Temperature Curve used to Determine Die Junction Temperature

ACS704ELC015-DS, Rev. 6

17

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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