data brief for further information contact your local stmicroelectronics sales office. july 2008 rev 1 1/4 4 STEVAL-IHT003V1 low-loss e-starter demonstration board for compressor starter circuits based on the acst6 features suitable for refrigerator and freezer 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 compresso r 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). 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. STEVAL-IHT003V1 www.st.com
schematic diagram STEVAL-IHT003V1 2/4 1 schematic diagram figure 1. e-starter circuit schematic 1. capacitor c3 is not soldered on the board, but c an be added in order to evaluate its impact on board immunity. r7 220 ? c1 10 nf r3 r4 30 k ? 0 t1 dz1 a c c2 q1 r5 10 k ? t2 m1 r2 470 k ? r1 620 ? d2 q2 j16 start 1 3 j17 ptc 1 3 j18 run 1 3 + d7 df06 2 4 d1 1n4007 r8 1 m ? c3 gnd r6 47 ? c4 22 nf v c2 v ak 510 k ? 10 nf ? 1 3 x nf (1) i a v c1 am00202 acst6 x0205n mmbf170 1n4148pmbt2222a pmbt2907a bzx55c
STEVAL-IHT003V1 revision history 3/4 2 revision history table 1. document revision history date revision changes 08-jul-2008 1 initial release.
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