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TR204 
DTA114EKA 
VL18V 
G2 
VCC 
Y A 
GND 
G2 
U38 
MC74HCT14ADTR2G 
R246 
11k 
R243 
29.4k 
VL5V 
R246: 11k is to big for U38 
input, change to value less 
than 2.2k 
Technical Memo 
Equivalent Circuit 
11OCT2014 
Tsuyoshi Horigome
G2 
C130 
G2 
VL18V 0.1uF 
R138 
47k 
R139 
11k 
VL5V 
G2 
V 
V 
V-INV 
NINV 
OUT 
V+ 
U100 
LM2903 
0s 5ms 10ms 15ms 20ms 25ms 30ms 35ms 40ms 
T i m e 
V(U101:1) V(R139:1) 
1.0V 
0.8V 
0.6V 
0.4V 
0.2V 
0V 
In normal condition OUT = 1, but it 
should be 0 for the circuit to work, 
change INV with NINV then the circuit 
can switch in normal condition

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Equivalent Circuit MEMO(12OCT2014)

  • 1. TR204 DTA114EKA VL18V G2 VCC Y A GND G2 U38 MC74HCT14ADTR2G R246 11k R243 29.4k VL5V R246: 11k is to big for U38 input, change to value less than 2.2k Technical Memo Equivalent Circuit 11OCT2014 Tsuyoshi Horigome
  • 2. G2 C130 G2 VL18V 0.1uF R138 47k R139 11k VL5V G2 V V V-INV NINV OUT V+ U100 LM2903 0s 5ms 10ms 15ms 20ms 25ms 30ms 35ms 40ms T i m e V(U101:1) V(R139:1) 1.0V 0.8V 0.6V 0.4V 0.2V 0V In normal condition OUT = 1, but it should be 0 for the circuit to work, change INV with NINV then the circuit can switch in normal condition