UM0277 datasheet(11/32 Pages) STMICROELECTRONICS

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UM0277

Getting started

11/32

Getting started

3.1

Load power

Initially, there is no heat sink mounted on the TO220-AB of the ACST6-7ST device. In this

case, Figure 2.1 of their datasheet shows that the maximum permanent allowed current is

1.5 A RMS, for an ambient temperature lower than 40 °C. If the ACST6-7ST must sink a

higher current, or works at a higher temperature, a heat sink can be added. Also refer to

AN1354 for more information on single-phase compressor control.

The ACS102-6TA, in a TO-92 package, can withstand a 0.2 A RMS permanent current up to

an ambient temperature of 90 °C. The ACS102-6TA can drive the common light bulbs found

in Fridge or Freezer without any problem. Indeed, a 25 W bulb will always sink a current

lower than 150 mA. The ACS110-7SB2, in DIL-8 package, can withstand a 1 A RMS

permanent current up to an ambient temperature of 90 °C. In this case, the ACS102-6TA

can drive a maximum 200W defrost resistor. Moreover, this AC switch can drive a fan (with a

RMS current lower than 1 A) instead of a defrost resistor without any additional snubber.

3.2

Measure points

Figure 5 shows the GND map and where the test points are placed on the board. Table 4

defines the measurement points.

Figure 5.

Measurement points (top layer view)

UM0277 Datasheet(PDF) 11 Page - STMicroelectronics