January 2017

DocID030275 Rev 1

1/4

For further information contact your local STMicroelectronics sales

office

www.st.com

STEVAL-IHT003V2

Low loss e-starter evaluation board for compressor starter

circuits based on the ACST6

Data brief

Features



Suitable for refrigerator and freezer

compressor applications



Reduces PTC resistor power losses



RoHS compliant

Description

The STEVAL-IHT003V2 evaluation board

represents an innovative solution patented by

STMicroelectronics to reduce the power losses

caused by positive temperature coefficient (PTC)

resistors in compressor starter circuits.

The solution features an ACST6 AC switch

device to turn off the PTC current after motor

start-up; note that the traditional PTC is still used

in the electronic starter circuit as it increases

circuit safety for AC switch short-circuits or diode

mode failure (ref. EN60335-1).

The design reduces starter standby losses from

(typ.) 2.5 W to 380 mW for 230 V applications, or

2.5 W to 40 mW for 100 V applications.

Before using the board with a compressor, the

PTC behavior must be checked (especially

VPTC1 and VPTC2 levels) and different R4

resistor values may be required.