SC212KSIT [SECELECTRONICS]
120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection; 120 kHz带宽，高电压隔离电流传感器，集成了过流检测
| 型号： | SC212KSIT |
| 厂家： | 
SEC Electronics Inc. |
| 描述： | 120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection |
| 文件： | 总13页 (文件大小：1086K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC212KSIT
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
1/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
General Description
The SEC™ SC212KSIT current sensor provides economical and precise means for current sensing
applications in industrial, commercial, and communications systems. The device is offered in a small
footprint surface mount package that allows easy implementation in customer applications.
The SC212KSIT consists of a precision linear Hall sensor integrated circuit with a copper conduction
path located near the surface of the silicon die. Applied current flows through the copper conduction
path, and the analog output voltage from the Hall sensor linearly tracks the magnetic field generated
by the applied current. The accuracy of the SC212KSIT is maximized with this patented packaging
configuration because the Hall element is situated in extremely close proximity to the current to be
measured.
High level immunity to current conductor dV/dt and stray electric fields, offered by SEC proprietary
integrated shield technology, results in low ripple on the output and low offset drift in high-side, high
voltage applications.
The voltage on the Overcurrent Input (VOC pin) allows customers to define an overcurrent fault
threshold for the device. When the current flowing through the copper conduction path (between the
IP+ and IP– pins) exceeds this threshold, the open drain Overcurrent Fault pin will transition to a logic
low state. Factory programming of the linear Hall sensor inside of the SC212KSIT results in
exceptional accuracy in both analog and digital output signals.
The internal resistance of the copper path used for current sensing is typically 1 mΩ, for low power
loss. Also, the current conduction path is electrically isolated from the low voltage sensor inputs and
outputs. This allows the SC212KSIT family of sensors to be used in applications requiring electrical
isolation, without the use of opto-isolators or other costly isolation techniques. The SC212KSIT is
provided in a small, surface mount SOIC16 package. The lead frame is plated with 100% matte tin,
which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally,
the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt
from RoHS. The device is fully calibrated prior to shipment from the factory.
Applications
1. Motor control and protection
2. Load management and overcurrent detection
3. Power conversion and battery monitoring / UPS systems
General Package Inform
Sens (typ)
Latched
Fault
I
T
Part Number
SC212KSIT
P(A)
A(°C)
Packing
at V= 5 V (mV/A)
Tape and Reel, 1000
pieces per reel
±25
56
Yes
–40 to 125
2/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Absolute Maximum Ratings
Characteristic
Symbol
VCC
Notes
Rating
Unit
V
Supply Voltage
8
8
Filter Pin
VFILTER
VIOUT
V
Analog Output Pin
Overcurrent Input Pin
32
8
V
VOC
V
Overcurrent
Pin
VFAULT
VFAULTEN
VZCR
8
V
FAULT
Fault Enable (FAULT_EN) Pin
8
V
Voltage Reference Output Pin
8
V
DC Reverse Voltage: VCC, FILTER, VIOUT
,
VRdcx
–0.5
V
VOC, FAUL,
_EN, and VZCR Pins
FAULT
Voltage by which pin
voltage can exceed
the VCC pin voltage
Excess to Supply Voltage: FILTER, VIOUT
,
VEX
0.3
V
VOC , FAULT_EN, and VZCR Pins
,
FAULT
Output Current Source
Output Current Sink
IIOUT(Source)
IIOUT(Sink)
TA
3
1
mA
mA
°C
Operating Ambient Temperature
Junction Temperature
Range K
–40 to 125
165
TJ(max)
°C
Storage Temperature
Tstg
–65 to 170
°C
Isolation Characteristics
Characteristic
Symbol
Notes
Rating
Unit
Agency type-tested for 60 seconds per
UL standard 1577
Dielectric Strength Test Voltage*
VISO
3000
VAC
For basic (single) isolation per UL
Working Voltage for Basic Isolation
VWFSI standard 1577; for higher continuous 277
voltage ratings, please contact SEC
VAC
Thermal Characteristics
Characteristic
Symbol
RθJA
Test Conditions
Value Unit
When mounted on SEC demo board with 1332 mm2 (654
mm2 on component side and 678 mm2 on opposite side)
of 2 oz. copper connected to the primary lead frame and
17 ºC/W
Package Thermal Resistance
3/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Functional Block Diagram
Terminal List Table, Latching Version
Number
Name
Description
Sensed current copper conduction path pins. Terminals
for current being sensed; fused internally, loop to IP–
pins; unidirectional or bidirectional current flow.
1 through 4
IP+
Sensed current copper conduction path pins. Terminals
for current being sensed; fused internally, loop to IP+
pins; unidirectional or bidirectional current flow.
5 through 8
IP–
9
GND
VZCR
Device ground connection.
Voltage Reference Output pin. Zero current (0 A)
reference; output voltage on this pin scales with VCC
(Not a highly accurate reference.)
10
.
Filter pin. Terminal for an external capacitor connected
from this pin to GND to set the device bandwidth.
11
12
FILTER
VIOUT
Analog Output pin. Output voltage on this pin is
proportional to current flowing through the loop
between the IP+ pins and IP– pins.
Overcurrent Fault pin. When current flowing
between IP+ pins and IP– pins exceeds the
overcurrent fault threshold, this pin transitions to a
logic low state.
13
FAULT
14
15
VCC
VOC
Supply voltage.
Overcurrent Input pin. Analog input voltage on this
pin sets the overcurrent fault threshold.
Enables overcurrent faulting when high. Resets
16
FAULT_EN
when low.
FAULT
4/13
SC212KSIT
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.
Typ.
Max. Units
ELECTRICAL CHARACTERISTICS
Supply Voltage1
VCC
3
–
–
5
5.5
–
V
V
VCCN
Nominal Supply Voltage
ICC
Supply Current
Output Capacitance Load
Output Resistive Load
VIOUT open,
VIOUT pin to GND
VIOUT pin to GND
pin high
–
–
10
11
–
–
14.5
10
–
mA
nF
kΩ
FAULT
CLOAD
RLOAD
Magnetic Coupling from
Device Conductor to Hall
Element
MCHALL
Current flowing from IP+ to IP– pins
–
9.5
–
G/A
Internal Filter Resistance2
RF(INT)
RPRIMARY TA = 25°C
–
–
1.7
1
–
–
kΩ
Primary Conductor
Resistance
mΩ
ANALOG OUTPUT SIGNAL CHARACTERISTICS
Full Range Linearity3
Symmetry4
ELIN
IP = ±IP0A
IP = ±IP0A
–0.75
99.1
±0.25
100
0.75
%
%
ESYM
100.9
Bidirectional Quiescent
Output
VOUT(QBI) IP = 0 A, TA = 25°C
VCC/2
–
–
V
TIMING PERFORMANCE CHARACTERISTICS
TA = 25°C, Swing IP from 0 A to IP0A
,
t
VIOUT Signal Rise Time
–
–
–
–
–
–
r
no capacitor on FILTER pin, 100 pF
fromVIOUT to GND
3
1
μs
μs
T = 25°C, no capacitor on FILTER
A
VIOUT Signal Propagation
Time
tPROP
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
,
VIOUT Signal Response
Time
tRESPONSE
4
μs
–3 dB, Apply IP such that VIOUT = 1
VIOUT
Bandwidth
Large
Signal
f3dB
V , no capacitor on FILTER pin,
pk-pk
–
–
120
35
–
–
kHz
100 pF from VIOUT to GND
Output reaches 90% of steady-state
level, no capacitor on FILTER pin, TA =
25°C
tPO
Power-On Time
μs
OVERCURRENT CHARACTERISTICS
Setting Voltage for
VOC
VCC×0.25
–
VCC×0.4
–
Overcurrent Switchpoint5
Signal Noise at
–
V
A
INCOMP
Overcurrent Comparator
Input
±
1
5
Switchpoint in VOC safe operating area;
assumes INCOMP = 0 A
Overcurrent Fault
EOC
Switchpoint Error6,7
–
–
±
–
%
V
Overcurrent
Output Voltage
Pin
FAULT
VFAULT
1 mA sink current at
pin
–
0.4
FAULT
5/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Fault Enable (FAULT_EN
Pin) Input Low Voltage
Threshold
VIL
VIH
RFEI
0.1×VCC
–
0.8 × VCC
–
–
–
1
V
V
Fault Enable (FAULT_EN
Pin) Input High Voltage
Threshold
–
Fault Enable (FAULT_EN
Pin) Input Resistance
–
–
MΩ
OVERCURRENT CHARACTERISTICS
Set FAULT_EN to low, VOC = 0.25 ×
VCC , COC = 0 F; then run a DC IP
exceeding the corresponding
overcurrent threshold; then reset
FAULT_EN from low to high and
measure the delay from the rising edge
of FAULT_EN to the falling edge of
Fault Enable (FAULT_EN
Pin) Delay8
tFED
–
15
μs
¯
FAULT
Set FAULT_EN to low, VOC = 0.25 ×
VCC , COC = 0 F; then run a DC IP
exceeding the corresponding
Fault Enable (FAULT_EN
Pin) Delay(Non-Latching
overcurrent threshold; then reset
FAULT_EN from low to high and
measure the delay from the rising edge
of FAULT_EN to the falling edge of
tFED(NL
–
150
–
ns
)
9
versions)
FAULT
FAULT_EN set to high for a minimum
of 20 μs before the overcurrent event;
Overcurrent Fault
Response Time
switchpoint set at VOC = 0.25 × VCC
;
tOC
–
–
1.9
–
–
μs
μs
delay from I exceeding overcurrent
P
fault threshold to
V
< 0.4 V,
FAULT
FAULT_EN set to high for a minimum
of 20 μs before the undercurrent event;
switchpoint set at VOC = 0.25 × VCC
delay from IP falling below the
Undercurrent Fault
Response
Time(Non-Latching
versions)
;
tUC
3
threshold to
overcurrent fault
V
> 0.8 ×
V
, without
CC
external COC capacitor, R
FAULT
= 330 kΩ
PU
Time from VFAULTEN < VIL to
> 0.8 × V , RPU = 330 kΩ
Overcurrent Fault Reset
Delay
tOCR
tOCH
ROC
–
–
2
500
250
–
–
–
–
ns
ns
V
CC
Time from VFAULTEN <VIL to rising edge
FAULT
Overcurrent Fault Reset
Hold Time
V
of
FAULT
Overcurrent Input Pin
Resistance
TA = 25°C, VOC pin to GND
MΩ
VOLTAGE REFERENCE CHARACTERISTICS
TA = 25 °C
reference)
(Not a highly accurate
VZCR
0.48×VCC 0.5×VCC 0.51×VCC
Voltage Reference Output
V
Source current
Sink current
3
50
–
–
–
–
mA
μA
Voltage Reference Output
Load Current
IZCR
Voltage Reference Output
Drift
∆VZCR
–
±10
–
mV
6/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
1. Devices are programmed for maximum accuracy at VCC = 5 V. The device contains ratiometry circuits that accurately alter
the 0 A Output Voltage and Sensitivity level of the device in proportion to the applied VCC level. However, as a result of
minor nonlinearities in the ratiometry circuit, additional output error will result when VCC varies from the VCC level at
which the device was programmed. Customers that plan to operate the device at a VCC level other than the VCC level at
which the device was programmed should contact their local SEC sales representative regarding expected device accuracy
levels
2. Under these bias conditions.
3. RF(INT) forms an RC circuit via the FILTER pin.
4. This parameter can drift by as much as 0.8% over the lifetime of this product.
5. This parameter can drift by as much as 1% over the lifetime of this product.
6. See page 8 on how to set overcurrent fault switch point.
7. Switchpoint can be lower at the expense of switch point accuracy.
8. This error specification does not include the effect of noise. See the INCOMP specification in order to factor in the additional
influence of noise on the fault switch point.
9. Fault Enable Delay is designed to avoid false tripping of an Overcurrent (OC) fault at power-up. A 15 μs (typical) delay will
always be needed, every time FAULT_EN is raised from low to high, before the device is ready for responding to any
overcurrent event.
10. During power-up, this delay is 15 μs in order to avoid false tripping of an Overcurrent (OC) fault.
7/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
PERFORMANCE CHARACTERISTICS
TA Range K, valid at TA = – 40°C to 125°C, VCC = 5 V, unless otherwise specified
Characteristic
Symbol
IPOA
IR
Test Conditions
Min. Typ. Max. Units
Optimized Accuracy
Range1
–12.5
–37.5
–
–
–
12.5
37.5
–
A
A
Linear Sensing Range
Noise2
T = 25°C, Sens = 56 mV/A, C = 0, C
RLOAD open
= 4.7 nF,
V
s)
NOISE(rm
A
f
LOAD
1.50
mV
IP = 12.5 A, TA = 25°C
–
–
–
–
–
–
56
56
–
–
–
–
–
–
mV/A
mV/A
mV/A
mV
Sensitivity3
IP = 12.5 A, TA = 25°C to 125°C
IP = 12.5 A, TA = –40°C to 25°C
IP = 0 A, TA = 25°C
Sens
57
±4
Electrical Offset
Voltage Variation
Relative to Vout
VOE
IP = 0 A, TA = 25°C to 125°C
IP = 0 A, TA = –40°C to 25°C
±14
±23
mV
4
mV
Over full scale of IPOA, IP applied for 5 ms, TA = 25°C
to 125°C
–
–
±2.2
±3.9
–
–
%
%
Total Output Error5
ETOT
Over full scale of IPOA, IP applied for 5 ms, TA =
–40°C to 25°C
1. Although the device is accurate over the entire linear range, the device is programmed for maximum accuracy over the
range defined by IPOA .The reason for this is that in many applications, such as motor control, the start-up current of the
motor is approximately three times higher than the running current.
2. Vpk-pk noise (6 sigma noise) is equal to 6 × VNOISE(rms). Lower noise levels than this can be achieved by using Cf for
applications requiring narrower bandwidth. See Characteristic Performance page for graphs of noise versus Cf and
bandwidth versus Cf.
3. This parameter can drift by as much as 2.4% over the lifetime of this product.
4. This parameter can drift by as much as 13 mV over the lifetime of this product.
5. This parameter can drift by as much as 2.5% over the lifetime of this product.
8/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Characteristic Performance
Bandwidth value，CF Capacitor connected between FILTER pin and GND
Noise versus External Capacitor Value
CF Capacitor connected between FILTER pin and GND
9/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Characteristic Performance Data
Accuracy Data
Electrical Offset Voltage versus Ambient Temperature
Sensitivity versus Ambient Temperature
Nonlinearity versus Ambient Temperature
Symmetry versus Ambient Temperature
Total Output Error versus Ambient Temperature
10/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Setting Overcurrent Fault Switchpoint
The VOC needed for setting the overcurrent fault switchpoint can be calculated as follows:
VOC = 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 SC212KSIT, if required overcurrent fault switchpoint is 25 A, and VCC = 5 V, then the
required VOC can be calculated as follows:
VOC = Sens × IOC = 56 × 25 = 1400 (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
pin voltage based on the value of the capacitor from that pin
FAULT
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
pin,
FAULT
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
pin
FAULT
11/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
starts discharging.
2. When the
pin voltage reaches approximately 2 V, the fault is latched, and an internal
FAULT
NMOS device pulls the
pin voltage to approximately 0 V. The rate at which the
FAULT
pin slews downward (see [4] in the figure) is dependent on the external capacitor, C ,
FAULT
on the
OC
pin.
FAULT
3. When the FAULT_EN pin is brought low, the
pin starts resetting if no OC fault
FAULT
condition exists, and if FAULT_EN is low for a time period greater than tOCH. The internal
NMOS pull-down turns off and an internal PMOS pullup turns on (see [7] if the OC fault
condition still exists).
4. The slope, and thus the delay to latch the fault is controlled by the capacitor, COC, placed on the
pin to ground. During this portion of the fault (when the
pin is between VCC and
FAULT
FAULT
2 V), there is a 3 mA constant current sink, which discharges COC. The length of the fault delay, t
is equal to:
COC ×(VCC − 2V )
t =
3mA
where VCC is the device power supply voltage in volts, t is in seconds and COC is in Farads. This
formula is valid for RPU equal to or greater than 330 kΩ. For lower-value resistors, the current
flowing through the RPU resistor during a fault event, IPU , will be larger. Therefore, the current
discharging the capacitor would be 3 mA – IPU and equation 1 may not be valid.
5. The
pin did not reach the 2 V latch point before the OC fault condition cleared. Because
FAULT
of this, the fixed 3 mA current sink turns off, and the internal PMOS pull-up turns on to recharge
COC through the pin.
FAULT
6. This curve shows VCC charging external capacitor COC through the internal PMOS pull-up. The
slope is determined by COC.
7. When the FAULT_EN pin is brought low, if the fault condition still exists, the latched
pin will be pulled low by the internal 3mA current source. When fault condition is
FAULT
removed then the Fault pin charges as shown in step 6.
8. At this point there is a fault condition, and the part is enabled before the
pin can charge to
FAULT
VCC. This shortens the user-set delay, so the fault is latched earlier. The new delay time can be
calculated by equation 1, after substituting the voltage seen on the
pin for V .
FAULT
CC
1
1
1
Vcc
4
6
4
4
8
5
6
4
2
2
2
6
2V
0V
7
3
Fault_En
Input
OC Fault Condition
(Active High)
12/13
SC212KSIT
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Package 16-pin SOICW
For Reference Only; not for tooling use (reference MS-013AA)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
13/13
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