LTC1531 Datasheet | Linear Technology

LTC1531 Self-Powered Isolated parator Features s s s s s s s DESCRIPTIO UL Recognized File E151738 to UL1577 Self-Powered Across Isolation Barrier 2500VRMS Isolation 2.5V Isolated Reference, ILOAD = 5m AMAX Zero-Cross Output for Line Power Dual Differential Input parator High Input Impedance parator U APPLICATIO S s s s s The LTC®1531 is an isolated self-powered dual differential parator. An internal capacitive isolation barrier provides 2500VRMS of isolation between the parator and its output. The part provides UL-rated isolated parisons without the need for an isolated supply since both parator power and output data are transmitted across the capacitive barrier. The parator data is transferred differentially across the isolation barrier to provide high mon mode voltage and noise immunity. The isolated side can supply a 2.5V reference output to power external sensor circuits such as a thermistor bridge. The dual differential parator inputs allow for parison 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 parator 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. TYPICAL APPLICATION Isolated Thermistor Temperature Controller AC 120V LOAD 25Ω TECCOR Q4008L4 OR EQUIVALENT NEUTRAL 150Ω 1k 2N2222 1N4004 3k 3W R1 680k R2 47k C1 0.01µF ISOLATION BARRIER 750Ω 0.5W VCC ZCDATA SHDN ZCPOS ZCNEG + + 100µF 390Ω DATA DANGER! LETHAL VOLTAGES IN THIS SECTION! - 5.6V 20µF 50V 5.6V VALID GND LTC1531 ISOGND 1 + VPW 2.5V VREG V1 V2 V3 V4 CMPOUT R5- 1M R6 22k 1 1 = ISOLATED GROUND - HYSTERESIS = 1°C AT TO 1 1531 TA01 RTHERM = 1µF...