ST IHT003V1 User Manual

Low-loss e-STARTER demonstration board for compressor
Features
compressor applications
Reduces PTC resistor power losses
Description
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.
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).
STEVAL-IHT003V1
starter circuits based on the ACST6
Data Brief
STEVAL-IHT003V1
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.
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.
July 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
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Schematic diagram STEVAL-IHT003V1

1 Schematic diagram

Figure 1. e-STARTER circuit schematic

C1
10 nF
BZX55C
A
1 M
V
C2
V
AM00202
D1
1N4007
R3
R4
30 k
510 k
R5
Q1
PMBT2907A
D2
C1
10 k
DZ1
C
Q2
R8
1N4148PMBT2222A
R7
C2
10 nF
(1)
C3
x nF
GND
220
1
3
0
R2
470 k
R1
620
1
D7
+
4
1
3
DF06
2
R6
1
3
MMBF170
M1
T2
X0205N
3
22 nF
C4
47
A
I
ACST6
T1
AK
V
J16
START
J17
1. Capacitor C3 is not soldered on the board, but can be added in order to evaluate its impact on board immunity.
2/4
PTC
J18
RUN
STEVAL-IHT003V1 Revision history

2 Revision history

Table 1. Document revision history

Date Revision Changes
08-Jul-2008 1 Initial release.
3/4
STEVAL-IHT003V1
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