NCS37012MNG 데이터 시트보기 (PDF) - ON Semiconductor
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NCS37012MNG Datasheet PDF : 9 Pages
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NCS37012
RECOMMENDED EXTERNAL COMPONENTS:
Component Type
Instance
Value
SCR
Q1
-
Diode
Dx
-
NPN
Q2
-
LED
Lx
-
Capacitor
CapSUP
3.3 mF
Capacitor
CapGN
1-10 nF
Capacitor
CapIDF
220 nF
Capacitor
CapBias
10 nF
Capacitor
CapCT
2.2 - 10 nF
Capacitor
CapSCR
-
Resistor
ResD
40 - 80k
Resistor
ResGN
100 - 400k
Resistor
ResMLD
400 - 800k
Resistor
ResTI
400 - 800k
Resistor
ResMAIN
10k
Resistor
ResGFTST
15k
Resistor
ResLED
1-5k
TVS
T1
-
Note
ON-MCR08
ON-1N4007
MMBT6517LT1G
LED pins drive opposite polarities
For a full bridge rectifier
Matched to current transformer
Sets the differential corner frequency at 1 kHz
Filtering component for CTbias voltage
Filtering and resonant capacitor for CT
Filtering component
Matched to current transformer
Matched to current transformer
Limiting resistor for the Mains Level Detector (MLD) input
Limiting resistor for the Trip Indicator (TI) input
For a full bridge rectifier
Sets the external differential test current (8 mA)
Sets the brightness of the LEDs
250-400V
LED AND SPEAKER FUNCTIONS
Device Function
Device State
No Power / Line Load Reversed
Power Up
Normal
Reset (Entered through PTT)
Abnormal
Tripped
Self-Test Fails (Tripped)
Self-Test Fails (Reset)
No Trip on Fault
LED[0]
OFF
HIGH for 500 ms
HIGH for 500 ms
then LOW
LOW
(Blink) HIGH
(Blink) HIGH
(Blink) HIGH
LED[1]
LOW
LOW
HIGH
HIGH
LOW
LOW
LOW
Speaker
OFF
OFF
ON (250 ms)
OFF
OFF
ON
ON
Filtering
The analog signal capture portion of the IC includes a
single pole filter that can be set externally with Cidf. This
provides an additional layer of protection against false
tripping under steady state noise conditions. High frequency
steady state noise is common with pumps, motors or other
cyclic noise generators.
Cidf = 220 nF = 1 KHz low pass.
For additional filtering suggestions please contact ON
Semiconductor.
Setting Trip Sensitivity
The CTresD resistor sets the threshold for the differential
current fault levels. Increasing CTresD causes the fault
levels to trip at lower differential currents. CT efficiency at
60 Hz must be considered.
. CTresD= 400*#Turns – Subject to CT efficiency at 60 Hz
The CTresGN resistor sets the threshold for ground to
neutral fault detection. The Rt parameter is the desired
ground to neutral resistance trip level. Higher CTresGN
values will cause the part to trip at higher ground to neutral
impedances.
CtresGN = #Turns^2 x Rt/2 – Subject to CT efficiency from
3 kHz to 4 kHz
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