STEVAL-IHT003V1
Low-loss e-STARTER demonstration board for compressor
starter circuits based on the ACST6
Data Brief
Features
■
Suitable for refrigerator and freezer
compressor applications
■
Reduces PTC resistor power losses
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Description
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The e-STARTER demonstration board represents
an innovative solution patented by
STMicroelectronics to reduce the power losses
caused by positive temperature coefficient (PTC)
resistors in compressor starter circuits.
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The solution features an ACST6 AC switch device
which is used to turn off the PTC current after
motor start-up. It should be noted that the
traditional PTC is still used in the electronic
starter circuit, as it increases the safety of the
circuit in cases of AC switch short-circuit or diode
mode failure (ref. EN60335-1).
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The design allows the starter standby losses to be
reduced from (typ) 2.5 W to 380 mW for 230 V
applications, or 2.5 W to 40 mW for 100 V
applications.
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Because this board is not a “plug and play”
solution, prior to using the board with a
compressor the PTC behavior must be checked
(especially VPTC1 & VPTC2 levels), and different
R4 resistor value may be required.
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July 2008
Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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Schematic diagram
Schematic diagram
VC2
1 MΩ
x nF(1)
0
10 nF
R8
C2
C3
M1
GND
X0205N
T2
R7
220 Ω
22 nF
1
RUN
J18
3
VAK
PTC
1
3
J17
1
START
J16
3
T1
ACST6
–
IA
47 Ω
C4
2
R6
3
1
DF06
D7
4
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AM00202
VC1
A BZX55C
R4
30 kΩ
C1
DZ1
10 kΩ
R5
D2
MMBF170
R2
470 kΩ
R1
620 Ω
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Q2
1N4148PMBT2222A
C
PMBT2907A
Q1
1N4007
D1
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10 nF
e-STARTER circuit schematic
R3
Figure 1.
510 kΩ
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1. Capacitor C3 is not soldered on the board, but can be added in order to evaluate its impact on board
immunity.
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Revision history
Revision history
Table 1.
Document revision history
Date
Revision
08-Jul-2008
1
Changes
Initial release.
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Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
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