August 2013

DocID025092 Rev 1

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www.st.com

STEVAL-IHT005V2

Demonstration board with full 3.3 V ACS/Triac control using the

STM32F100

Data brief

Features

•

Complete solution for -3.3 V control

•

Input voltage range: 90-265 VAC 50/60 Hz

•

Negative 6 V/3.3 VDC aux power supply

based on the VIPer16L in buck-boost

topology

•

Total power consumption in standby mode

lower than 0.5 W for 264 V/50 Hz

•

48-pin, 32-bit value line family

STM32F100C4T6B MCU as main controller

•

Zero voltage switching (ZVS) interrupt to

synchronize MCU events with voltage mains

•

1 x T1635H-6T and 1 x ACST1635-8FP for

phase control of high power loads

•

5 discrete power level states with soft

change for phase-angle controlled devices

•

1 x Z0109 and 3 x ACS108 for full wave

control of low power loads

•

Relay to demonstrate board noise

robustness

•

Red LED to indicate board mains supply

•

Green LED for each ACS/ACST/Triac to

indicate device on/off status

•

JTAG programming connector

•

External wire loop for gate current

measurement

•

I

•

IEC 61000-4-4 pre-compliance test passed

(burst up to 8 kV)

•

IEC 61000-4-5 pre-compliance test passed

(surge up to 2 kV)

•

RoHS compliant

Description

The STEVAL-IHT005V2 is designed as a

complete solution proposal for home appliance

applications based on STMicroelectronics™

components. Special emphasis is placed on

demonstration of a robust full 3.3 V solution,

based on 4 kV level in class A during an IEC-

61000-4-4 (burst) test. The board also allows

designers to evaluate the feasibility of AC switch

control with a 3.3 V supply. Gate currents can be

measured and compared to the information given

in application note AN2986. STEVAL-IHT005V2

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 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-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 using 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. To limit inrush current and possible

current peaks, the 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.