UM0277
Getting started
3 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
shows the GND map and where the test points are placed on the board.
defines the measurement points.
Figure 5.
Measurement points (top layer view)
