October 2013
DocID024503 Rev 1
1/27
UM1631
User manual
STEVAL-IHT005V2 - 3.3 V control of ACS
®
/Triac with STM32™
Introduction
The STEVAL-IHT005V2 demonstration board is designed for the home appliance market,
with a focus on the demonstration of a robust solution with a 3.3 V supplied 32-bit MCU.
Targeted applications are mid-end and high-end washing machines, dishwashers and
dryers with different kinds of ACS
®
/Triacs.
The demonstration board is based on the recently introduced 48-pin, 32-bit
STM32F100C4T6B MCU running at 24 MHz (RC user-trimmable internal RC clock),
featuring 16 kBytes of Flash memory, 12-bit A/D converter, 5 timers, communication
interfaces, and 4 kBytes of SRAM.
The power supply circuitry is based on the VIPer
®
16L, an offline converter with an 800 V
avalanche rugged power section, operating at 60 kHz. The power supply provides negative
6 V in buck-boost topology.
The STEVAL-IHT005V2 can control 2 high power loads up to 2830 W thanks to the T1635H,
a 16 A, 600 V high temperature Triac and up to 2050 W thanks to the ACST1635-8FP
a 16 A, 800 V high temperature overvoltage protected ACST device. The high power load
control is based on phase angle control. In order to limit the inrush current and possible
current peaks, the demonstration board features a soft-start routine and a smooth power
change function for the high power loads.
The STEVAL-IHT005V2 can also control 4 low power loads up to 100 W thanks to
3 ACS108-8S, 0.8 A, 800 V overvoltage protected ACS devices and a Z0109, 1 A standard
4 quadrant 600 V Triac.
The demonstration board passed the precompliance tests for EMC directives
IEC 61000-4-4 (burst up to 8 kV) and IEC 61000-4-5 (surge up to 2 kV).
When put in standby mode, the STEVAL-IHT005V2 has an overall standby power
consumption below 500 mW at 264 V/50 Hz.
Figure 1. STEVAL-IHT005V2
