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PDF SC206KSIT Data sheet ( Hoja de datos )

Número de pieza SC206KSIT
Descripción High Voltage Isolation Current Sensor
Fabricantes SEC Electronics 
Logotipo SEC Electronics Logotipo



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SC206KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Features and Benefits
1. Industry-leading noise performance with greatly improved bandwidth through proprietary
amplifier and filter design techniques
2. Small footprint package suitable for space-constrained applications
3. 1 mΩ primary conductor resistance for low power loss
4. High isolation voltage, suitable for line-powered applications
5. User-adjustable Overcurrent Fault level
6. Overcurrent Fault signal typically responds to an overcurrent condition in < 2 μs
7. Integrated shield virtually eliminates capacitive coupling from current conductor to die due to
high dV/dt voltage transients
8. Filter pin capacitor improves resolution in low bandwidth applications
9. 3 to 5.5 V, single supply operation
10. Factory trimmed sensitivity and quiescent output voltage
11. Chopper stabilization results in extremely stable quiescent output voltage
12. Ratiometric output from supply voltage
Package: 16-pin SOIC Hall Effect IC Package (suffix SI)
Typical Application Circuit
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SC206KSIT pdf
SC206KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
COMMON OPERATING CHARACTERISTICS
Valid at TA = –40°C to 125°C, VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
ELECTRICAL CHARACTERISTICS
Supply Voltage1
VCC
Nominal Supply Voltage
VCCN
Supply Current
Output Capacitance Load
Output Resistive Load
Magnetic Coupling from
Device Conductor to Hall
Element
2
Internal Filter Resistance
Primary Conductor
Resistance
ICC
CLOAD
RLOAD
VIOUT open, FAULT pin high
VIOUT pin to GND
VIOUT pin to GND
MCHALL Current flowing from IP+ to IP– pins
RF(INT)
RPRIMARY TA = 25°C
ANALOG OUTPUT SIGNAL CHARACTERISTICS
Full Range Linearity3
Symmetry4
ELIN
ESYM
IP = ±IP0A
IP = ±IP0A
Bidirectional
Output
Quiescent VOUT(QBI) IP = 0 A, TA = 25°C
3
10
–0.75
99.1
TIMING PERFORMANCE CHARACTERISTICS
VIOUT Signal Rise Time
TA = 25°C, Swing IP from 0 A to IP0A,
tr no capacitor on FILTER pin, 100 pF
fromVIOUT to GND
VIOUT Signal Propagation
Time
VIOUT Signal Response
Time
VIOUT Large Signal
Bandwidth
Power-On Time
tPROP
tRESPONSE
f3dB
tPO
TA = 25°C, no capacitor on FILTER
pin,100 pF from VIOUT to GND
TA = 25°C, Swing IP from 0 A to IP0A,
no capacitor on FILTER pin, 100 pF
fromVIOUT to GND
–3 dB, Apply IP such that VIOUT = 1
Vpk-pk, no capacitor on FILTER pin,
100 pF from VIOUT to GND
Output reaches 90% of steady-state
level, no capacitor on FILTER pin, TA =
25°C
OVERCURRENT CHARACTERISTICS
Setting Voltage for
5
Overcurrent Switchpoint
VOC
VCC×0.25
Signal Noise at
Overcurrent Comparator
Input
INCOMP
Overcurrent Fault
Switchpoint Error6,7
EOC
Switchpoint in VOC safe operating area;
assumes INCOMP = 0 A
Overcurrent FAULT Pin
Output Voltage
V FAULT
1 mA sink current at FAULT pin
Typ.
5
11
9.5
1.7
1
±0.25
100
VCC/2
3
1
4
120
35
±1
±5
Max. Units
5.5 V
–V
14.5 mA
10 nF
– G/A
– kΩ
0.75
100.9
%
%
V
μs
μs
μs
kHz
μs
VCC×0.4 V
–A
–%
0.4 V
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SC206KSIT arduino
Setting Overcurrent Fault Switchpoint
SC206KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
The VOC needed for setting the overcurrent fault switchpoint can be calculated as follows:
VOC = 1.17 × Sens × | IOC | ,
where VOC is in mV, Sens in mV/A, and IOC (overcurrent fault switchpoint) in A.
| Ioc | is the overcurrent fault switchpoint for a bidirectional (AC) current, which means a
bi-directional sensor will have two symmetrical overcurrent fault switchpoints, +IOC and –IOC .
See the following graph for IOC and VOC ranges:
Example:For SC206KSIT, if required overcurrent fault switchpoint is 10 A, and VCC = 5 V, then the
required VOC can be calculated as follows:
VOC = 1.17 × Sens × IOC = 1.17 × 151 × 10 = 1767 (mV)
Overcurrent Fault Operation
The primary concern with high-speed fault detection is that noise may cause false tripping. Various
applications have or need to be able to ignore certain faults that are due to switching noise or other
parasitic phenomena, which are application dependant. The problem with simply trying to filter out
this noise in the main signal path is that in high-speed applications, with asymmetric noise, the act of
filtering introduces an error into the measurement.
To get around this issue, and allow the user to prevent the fault signal from being latched by noise, a
circuit was designed to slew the FAULT pin voltage based on the value of the capacitor from that pin
to ground. Once the voltage on the pin falls below 2 V, as established by an internal reference, the
fault output is latched and pulled to ground quickly with an internal N-channel MOSFET.
Fault Walk-through
The following walk-through references various sections and attributes in the figure below. This figure
shows different fault set/reset scenarios and how they relate to the voltages on the FAULT pin,
FAULT_EN pin, and the internal Overcurrent (OC) Fault node, which is invisible to the customer.
1. Because the device is enabled (FAULT_EN is high for a minimum period of time, the Fault
Enable Delay, tFED , 15 μs typical) and there is an OC fault condition, the device FAULT pin
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