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LTC1531CSW
LTC1531 Self-Powered Isolated Comparator OBSOLETE PRODUCT DATA SHEET FOR REFERENCE ONLY Consult www.linear.com for possible alternate source. U FEATURES ■ ■ ■ ■ ■ ■ ■ DESCRIPTIO UL Recognized File E151738 to UL1577 Self-Powered Across Isolation Barrier 2500VRMS Isolation 2.5V Isolated Reference, ILOAD = 5mAMAX Zero-Cross Output for Line Power Dual Differential Input Comparator High Input Impedance Comparator The LTC®1531 is an isolated self-powered dual differential comparator. An internal capacitive isolation barrier provides 2500VRMS of isolation between the comparator and its output. The part provides UL-rated isolated comparisons without the need for an isolated supply since both comparator power and output data are transmitted across the capacitive barrier. The comparator data is transferred differentially across the isolation barrier to provide high common mode voltage and noise immunity. U APPLICATIO S ■ ■ ■ ■ The isolated side can supply a 2.5V reference output to power external sensor circuits such as a thermistor bridge. The dual differential comparator inputs allow for comparison of two differential voltages as well as single-ended voltages. The powered side provides a latched data output as well as a pulsed zero-cross comparator output for controlling a triac. The part is available in a 28-lead SO package. Self-Powered Isolated Sensing Isolated Temperature Control Isolated Voltage Monitor Isolated Switch Control , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATION Isolated Thermistor Temperature Controller AC 120V LOAD 25Ω R1 680k 1N4004 TECCOR Q4008L4 OR EQUIVALENT NEUTRAL C1 0.01μF R2 47k 3k 3W ISOLATION BARRIER RTHERM = 1μF RO • eB (1/T – 1/TO) B = 3807 TO = 297°K 1 + 750Ω 0.5W 150Ω VCC 1k SHDN ZCPOS ZCNEG VPW 2.5V ZCDATA 2N2222 + 100μF + DANGER! LETHAL VOLTAGES IN THIS SECTION! –5.6V 20μF 50V 5.6V 390Ω LED DATA + Q D – VALID GND VREG V1 T V2 V3 V4 R4 50k CMPOUT LTC1531 ISOGND THERM 30k YSI 44008 R5*1M R6 22k 1 1 1 1531 TA01 1 = ISOLATED GROUND *HYSTERESIS = 1°C AT TO 1
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