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SI8503-C-IM Arkusz danych(PDF) 9 Page - List of Unclassifed Manufacturers |
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SI8503-C-IM Arkusz danych(HTML) 9 Page - List of Unclassifed Manufacturers |
9 / 37 page Si85xx Preliminary Rev. 0.4 9 2. Functional Overview The Si85xx ac current sensor family of products mimics the functionality of traditional current transformer (CT) circuits 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 Figures 2 and 3, current flowing through the metal package slug induces a signal in the pickup coil on the Si85xx die. This signal is applied to the input of an integrator that reconstructs the ac current flowing from IIN to IOUT. Onboard circuitry provides cycle-by-cycle integrator reset and temperature and offset voltage compensation to achieve initial measurement accuracy to within ±5%. Figure 2. Si850x (Single Output) Block Diagram Figure 3. 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 (QFN package option), the Si85xx is among the smallest current sensors available. Large output signal: The nominal 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 (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: All versions are available with an initial maximum error of ±5% of reading; one of the most accurate 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 a minimum of 1,000 VRMS (for QFN package) or 5kVRMS (for SOIC package) of common-mode voltage range (or 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 |
Podobny numer części - SI8503-C-IM |
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Podobny opis - SI8503-C-IM |
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