Data brief

For further information contact your local STMicroelectronics sales office.

December 2010

Doc ID 18344 Rev 1

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STEVAL-IHT005V1

3.3 V control of ACS/Triac with STM32

Features

based on the Viper16L in buck-boost topology

lower than 0.3 W for 264 V / 50 Hz

STM32F100C4T6B MCU as main controller

synchronize MCU events with voltage mains

control of high power loads

for phase angle controlled devices

of low power loads

robustness

mains

show the device is turned on

(burst up to 8 kV)

(surge up to 2 kV)

Description

The STEVAL-IHT005V1 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. Target

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 48-pin 32-bit

STM32F100C4T6BMCU, 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 VIPer16L,

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-IHT005V1 can control two

high power loads up to 2640 W, thanks to the

T1235H, a 12 A 600 V high temperature Triac,

and up to 1840 W ACST12-7C, 12 A 700 V

overvoltage protected ACSTTM device. The high

power load control is based on phase angle

control. To limit the in-rush 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-

IHT005V1 can also control 4 low power loads up

to 100 W, thanks to 3 ACS108-6S, 0.8 A 600 V

overvoltage protected ACSTM devices and a

Z0109, 1 A standard 4 quadrant 600 V Triac. The

demonstration board passed the pre-compliance

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-

IHT005V1 has an overall standby power

consumption below 300 mW at 264 V / 50 Hz.

STEVAL-IHT005V1

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