ST UM0575 User Manual

UM0575
User manual
STEVAL- IHT003V1, e-STARTER demonstration board
based on the ACST6 and X02
Introduction
The e-STARTER demonstration board (Figure 1) presents an innovative solution, patented
by STMicroelectronics, to reduce the power losses due to the positive thermal coefficient
(PTC) resistors in compressor starter circuits.
This solution features an ACST6 device which is used to turn off the PTC current after the
motor startup. It should be noted that the traditional PTC is still used in the electronic starter
circuit because it increases safety in case of ACST short-circuit or diode-mode failure (ref.
EN60335-1). This solution allows the starter standby losses to be decreased from typically
2.5 W to 380 mW or 40 mW, respectively for 230 V and 100 V applications.
The e-STARTER operation principle along with detailed schematics are given as well as
demonstration board performances and the method to adapt the circuit to a dedicated
compressor.
It should be noted that this board is not a "plug and play" solution. First, the PTC behavior
has to be checked (especially V & V levels as explained in Section 3.1) and then
PTC1 PTC2
the R4 resistor value has to be chosen before using the board with a compressor.
Figure 1. STEVAL- IHT003V1, e-STARTER demonstration board
AM01038v1
February 2009 Rev 1 1/20
www.st.com