Si85xx Si85XX UNIDIRECTIONAL AC CURRENT SENSORS Features Single-chip ac current sensor 50 kHz to 1 MHz input frequency Low loss: <1.3 m primary series range resistance and <2 nH inductance FAULT output to safeguard operation Leading-edge noise suppression Large 2 V min output at full scale PP eliminates need for leading-edge High-side or low-side current sensing blanking Compact 4x4x1 mm QFN package Ping-Pon output version allows (1 kV isolation) RMS one Si85xx to replace two current 20-pin wide-body SOIC transformers in full-bridge designs (5 kV isolation) RMS 5, 10, and 20 A full-scale versions 40 to 125 C operating range 5% initial accuracy UL/VDE/CSA approval Applications Power supplies Lighting equipment Motor controls Industrial equipment Ordering Information: Description See page 26. 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 Pin Assignments: transformers, Hall effect devices, DCR circuits, and other approaches. The Si85xx See page 24 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 20-Pin SOIC isolated from the other package pins, providing up to 5 kV isolation level per RMS safety approval ratings. VDD IIN MODE IIN Safety Approval (20-Pin SOIC Only) R1 IIN R2 IIN UL 1577 recognized CSA component notice 5A approval R3 IIN Si851x 5000 V for 1 minute IEC 60950, 61010, 60601 RMS R4 IOUT approved OUT1 IOUT VDE certification conformity OUT2 IOUT IEC 60747-5-2 (VDE0884 Part 2) TRST/FAULT IOUT GND IOUT Functional Block Diagram 12-Pin QFN R1 R2 R3 R4 IIN VDD Si851x R1 VIN IIN R2 MODE RESET LOGIC MODE LOGIC VDD1 TRST IIN R2 R3 Si850x GND1 OUT Si851x R4 OUT1 INTEGRATOR SIGNAL CONDITIONING R1 GND2 IOUT OUT1 OUT2 IOUT OUT2 Q1 PH1 L VOUT C Q2 PH2 AUTO CALIBRATION TEMP ADC SENSOR LOGIC Typical Application IOUT GND TRST/FAULT VDD 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. METAL SLUG MODE TRST/FAULT GND VDDSi85xx 2 Preliminary Rev. 0.4