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LTC1531 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1531 Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page 4 LTC1531 PIN FUNCTIONS VCC (Pin 1): Powered Side Power Supply. SHDN (Pin 2): Active Low Chip Shutdown. A low signal causes the circuitry to power down. DATA logic output level will be reset to zero during power-down. ZCNEG (Pin 3): Zero-Cross Comparator Negative Input. ZCPOS (Pin 4): Zero-Cross Comparator Positive Input. VPW (Pin 11): Isolated Power Supply. Connect to an external storage capacitor. CMPOUT (Pin 12): Isolated Latched Comparator Data. CMPOUT is active when VREG is on. The CMPOUT output can be used on the isolated side for hysteresis (see applications). The output will contain the result of the previous comparison. When VREG is low, the CMPOUT pin is Hi-Z. VREG (Pin 13): Isolated 2.5V Regulated Output. Pulsed on for 100 µs with a maximum load current of 5mA. VREG also supplies power to the CMPOUT output (Pin 12). ISOGND (Pin 14): Isolated Side Power Ground. V4 (Pin 15): Comparator Negative Input. The comparator inputs are summed together with the comparison output equal to (V1 + V2)/2 > (V3 + V4)/2 or equivalently (V1 – V3) > (V4 – V2). V3 (Pin 16): Comparator Negative Input. V2 (Pin 17): Comparator Positive Input. V1 (Pin 18): Comparator Positive Input. VALID (Pin 25): Pulsed Output. Indicates when valid data was received from the comparator. May be used to clock DATA to external circuitry. DATA (Pin 26): Latched Comparator Result. DATA holds the value of the last valid comparison result. DATA changes only when a valid comparison was received from the isolated side. ZCDATA (Pin 27): A 24 µs to 30µs Pulsed Output. The pulse occurs when the DATA output is high and the zero- cross comparator inputs (ZCPLS-ZCNEG) cross zero volts differential. Typically the zero-cross input signal is an RC phase shifted AC sine wave. This output is a TTL level pulse that can be used for firing an external triac. GND (Pin 28): Power Supply Low Impedance Ground Connection. IVREG (mA) 1531 F03 30 25 20 15 10 5 0 0 1 2 3 4 VCC = 4.5V TA = 25°C VCC = 5.5V VCC = 5V Figure 3. Average tSAMPLE vs IVREG TYPICAL PERFORMANCE CHARACTERISTICS Figure 4. VRMS vs Frequency FREQUENCY (Hz) 4500V BREAKDOWN LIMIT 100k 1M 100M 1531 F04 10k 10M 2500VRMS 450mV 4.5V 45V 450V SLEW RATE = ( π)(f)(VP-P) = (1.11)(f)(VRMS) = VRMS 50V/ µs (1.11)(f) |
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