NCS37020
Table 5. RECOMMENDED EXTERNAL COMPONENTS
Component Type
Controller
SCR
Instance
U1
Value
−
Note
NCS37020DTBR2G
Q1A, Q1B
Q2
−
0.8 A, 400 V
MMBTA42
NPN
−
Diode Bridge
Diode
D1−D4
D5
−
MB4S
−
1 A, 300 V
Diode
D6, D8, D9
D7
−
15 mA, 300 V
LED for EOL Indicator
LED
−
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
C1
2.2 mF
1 mF
SUP pin holding capacitor, Ceramic 25 V
REF filter capacitor, 6.3 V
C2
C3
100 nF
1 nF
SCR gate filter capacitor
C4
Dynamic V filter capacitor
OS
C5
33 nF
CT filter capacitor
C6
2.2 nF
22 to 56 nF
49.9kW
49.9kW
1 MW
CTB bias capacitor
C7
IDF filter capacitor
R1A
R1B
R2
Shunt regulator current limit resistor, ¼W
Shunt regulator current limit resistor, ¼W
AC zero cross current limit resistor
IDF filter resistor
Resistor
Resistor
Resistor
R4
4.7 to 20 kW
31.6 kW
243 W
10 kW
3.3 kW
4.7 kW
15 kW
4.7 kW
3.3 kW
4.7 kW
1 kW @ 100 MHz
1 kW @ 100 MHz
800 turns
Resistor
R5
Precision resistor (1%), Sets the differential trip level at 5 mA
Precision resistor (1%), Differential burden/CT low pass filter
Sets the self−test GF current
Current limit resistor for LED bias
Current limit resistor for Q2 bias
Sets the manual GF test current
Current limit resistor for Q1A bias
Current limit resistor for Q1B bias
SCR gate bleeder resistor
RMS
Resistor
R7
Resistor
R8
Resistor
R9
Resistor
R10
R11
Resistor
Resistor
R12A
R12B
R13
L1
Resistor
Resistor
Ferrite Bead
Ferrite Bead
Current Transformer
CIM05U102, CT RF filter
L2
CIM05U102, CT RF filter
Sense Coil
C5029−01C
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