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SI8506-B-IM Fiches technique(PDF) 6 Page - Silicon Laboratories

No de pièce SI8506-B-IM
Description  UNIDIRECTIONAL AC CURRENT SENSORS
Download  24 Pages
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Fabricant  SILABS [Silicon Laboratories]
Site Internet  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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Si85xx
6
Preliminary Rev. 0.1
2. Functional Overview
The Si85xx AC Current Sensor family of products mimic
the functionality of a traditional current transformer (CT)
circuit with burden resistor, diode and output filter, but
offers enhanced performance and added capabilities.
These devices use inductive current sensing and on-
board signal conditioning electronics to generate a 2 V
full-scale output signal proportional to the ac current
flowing from the IIN to the IOUT terminals. As shown in
Figure 1 and Figure 2, current flowing through the metal
package slug induces a signal in the pickup coil on-
board the Si85xx die. This signal is applied to the input
of an integrator that re-constructs the ac current flowing
from IIN to IOUT. On-board circuitry provides cycle-by-
cycle integrator reset, and temperature and offset
voltage
compensation
to
achieve
measurement
accuracy to within ±5%.
Figure 1. Si850x (Single Output) Block Diagram
Figure 2. Si851x (Ping Pong Output) Block
Diagram
The Si85xx is superior to other current sensing
approaches and benefits the system in a number of
ways:
Small size: With its 4x4 mm footprint and 1 mm
height, the Si85xx is among the smallest current
sensors available.
Large output signal: The 2.0 V full-scale output
swing offers superior noise immunity versus other
current sensing technologies.
Low loss: The Si85xx adds only 1.3 m
Ω (at 25 °C)
to the sensing path making it one of the lowest loss
current sensors available. Low 2 nH primary series
inductance is 2,000 times lower compared to a CT,
and results in significantly less ringing.
High precision: The Si8501/2/3 versions are
available with a max error of ±5% of reading; one of
the highest accuracy current sensors available.
Ping-Pong output mode (Si851x): Alternately
routes the current measurements from each side of
a full-bridge circuit to separate output pins for
comparison, which is very useful for transformer flux
balancing applications. Eliminates a second CT in a
full-bridge application.
Leading edge noise suppression: Filters out
reflected noise due to long reverse recovery time of
output rectifier. Eliminates the need for external
leading edge blanking circuit.
High common mode voltage: The Si85xx offers up
to 1,000 VDC of isolation making it useful over a
very wide voltage range.
Si850x
VDD1
TRST
IOUT
IIN
GND1
INTEGRATOR
SIGNAL CONDITIONING
ADC
AUTO CALIBRATION
LOGIC
TEMP
SENSOR
OUT
VDD2
R1
R2
RESET LOGIC
GND2
NC
GND3
PICKUP
COIL
Si851x
VDD
TRST/FAULT
IOUT
IIN
GND
INTEGRATOR
SIGNAL CONDITIONING
ADC
AUTO CALIBRATION
LOGIC
TEMP
SENSOR
OUT1
OUT2
MODE LOGIC
MODE
R1
R2
R3
R4
RESET LOGIC
PICKUP
COIL


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