UM0277 datasheet(10/32 Pages) STMICROELECTRONICS

10 / 32 page

Functional description

UM0277

10/32

In order to reduce the surge current, a R6 resistor is used in series with the C3 capacitor.

The power dissipation of this resistor is limited to ½ Watt. In this case, with a 30 mA output

DC average current, a 47

Ω resistor value can be used on the board for typical application

conditions (100/230 VRMS line voltage and 50/60 Hz mains frequency).

Appendix G defines, in typical application conditions (nominal capacitor value, nominal RMS

line voltage), the C3 capacitor value for a 30mA output DC current versus different AC mains

and frequency values used in different countries. Moreover, the typical and minimal (nominal

capacitor value -10%, minimum RMS line voltage) output DC current capabilities are given

for information.

One particularity of the STEVAL-ITH001V1 board power supply is to be a “negative” one.

Indeed, the VDD terminal is connected to Neutral. This means that the GND voltage is 5V

below Neutral. Such a connection is mandatory for driving ACS devices. Indeed, ACSs can

only be triggered by a negative current (i.e. sourced from the gate).

2.4

Graphic user interface (GUI)

A Graphic User Interface (GUI) is provided to set ST7LITE39F2 Microcontroller parameters

and to access MCU information through the Serial Communication Interface (SCI). The GUI

provides the following features (refer to the “Help” menu of the GUI software for more

information):

●

Sliding buttons to change MCU parameters:

–

temperature hysteresis

–

evaporator temperature order

–

gate current pulse widths and delays

–

time before defrost activation and defrost duration

–

ZVS delay (synchronization of MCU commands with the mains voltage)

●

Virtual graduated potentiometer to set the evaporator temperature between low,

medium or high levels

●

Virtual switch to force the loads to ON or OFF states (Light, Defrost, Compressor) for

easier board validation

●

Measurement and storage of several parameters during operation (duty cycle and

running period of the compressor, evaporator temperature evolution, mains frequency

and loads status)

Table 3.

Maximum output DC average currents

capacitor

Max. output DC current for typical

application conditions

Max. output DC current for worst

application case

220nF

7.1mA

5.5mA

330nF

10.7mA

8.3mA

470nF

15.2mA

11.8mA

680nF

22.1mA

17.1mA

1µF

32.5mA

25.2mA

1.5µF

48.8mA

37.8mA

UM0277 Datasheet(PDF) 10 Page - STMicroelectronics

UM0277 Datasheet(HTML) 10 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Datasheet Download

Link URL