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Si85xx
Si85 XX U N ID I R E C TI ON A L A C C URRENT S ENSORS
Features
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Single-chip ac current sensor
Low loss: <1.3 m ? primary series
resistance and <2 nH inductance
Leading-edge noise suppression
eliminates need for leading-edge
blanking
"Ping-Pong" output version allows
one Si85xx to replace two current
transformers in full-bridge designs
5, 10, and 20 A full-scale versions
±5% initial accuracy
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50 kHz to 1 MHz input frequency
range
FAULT output to safeguard operation
Large 2 V PP min output at full scale
High-side or low-side current sensing
Compact 4x4x1 mm QFN package
(1 kV RMS isolation)
20-pin wide-body SOIC
(5 kV RMS isolation)
–40 to 125 °C operating range
UL/VDE/CSA approval
Applications
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Power supplies
Motor controls
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Lighting equipment
Industrial equipment
Description
The Si85xx products are unidirectional ac current sensors available in full-scale
ranges of 5, 10, and 20 A. Si85xx products are ideal upgrades for older current-
sensing technologies offering size, performance, and cost advantages over current
transformers, Hall effect devices, DCR circuits, and other approaches. The Si85xx
are extremely low-loss, adding less than 1.3 m ? of series resistance and less than
2 nH series inductance in the sensing path at 25 °C. Current-sensing terminals are
isolated from the other package pins, providing up to 5 kV RMS isolation level per
Ordering Information:
See page 26.
Pin Assignments:
See page 24
20-Pin SOIC
safety approval ratings.
Safety Approval (20-Pin SOIC Only)
VDD
MODE
R1
IIN
IIN
IIN
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UL 1577 recognized
?? 5000 V RMS for 1 minute
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CSA component notice 5A approval
?? IEC 60950, 61010, 60601
R2
R3
R4
Si851x
IIN
IIN
IOUT
approved
OUT1
IOUT
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VDE certification conformity
?? IEC 60747-5-2 (VDE0884 Part 2)
OUT2
TRST/FAULT
GND
IOUT
IOUT
IOUT
Functional Block Diagram
12-Pin QFN
IIN
R1
R2
R3
R4
Si851x
VDD
VIN
R1
RESET LOGIC
MODE LOGIC
MODE
OUT1
VDD1
R2
GND1
TRST
Si850x
IIN
OUT
R2
R3
R4
Si851x
IIN
INTEGRATOR
SIGNAL CONDITIONING
OUT2
R1
IOUT
GND2
OUT1
OUT2
IOUT
PH1
Q1
L
C
VOUT
PH2
Q2
TEMP
SENSOR
ADC
AUTO CALIBRATION
LOGIC
Typical Application
IOUT
GND
VDD
TRST/FAULT
Patents pending
Preliminary Rev. 0.4 6/12
Copyright ? 2012 by Silicon Laboratories
Si85xx
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
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