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PFS728EG Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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PFS728EG Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 30 page Rev. D 12/11 7 PFS704-729EG www.powerint.com PI-5338-021711 VE ~5 V (full power) ~4.8 V PFS704-716 VIN < 140 VAC PFS704-716 PFS704-716 VIN > 170 VAC PFS723-729 ~5 V ~2.5 V ~1.25 V ~0.8 V VIN ~170 VAC ~140 VAC ~5 V ~2.5 V controlled with respect to the internal error-voltage level (output power) to allow the converter to maintain output voltage regulation and relatively flat conversion efficiency between 10% to 100% of rated load which is essential to meet many efficiency directives. The degree of frequency slide is also controlled as a function of peak input line voltage, at high input line the maximum off-time voltage reference at zero error-voltage will be approximately 1/2 of the maximum value at low input line conditions. The lower V OFF slope reduces the average frequency swing for high input line operation. Protection Modes VOLTAGE MONITOR (V) Pin Shutdown The VOLTAGE MONITOR pin features a shutdown protection mode which can be used with the VOLTAGE MONITOR pin resistor or external circuitry to cover system faults. During start-up (1 V < V FB < 5.8 V) in the event the current through the VOLTAGE MONITOR pin exceeds the I V(OFF) threshold for a duration exceeding approximately (1 ms), the IC disables the internal MOSFET for the entire duration that the V pin current is above I V(OFF). In normal operation, if the current through the V pin exceeds the I V(OFF) threshold for a duration exceeding tV(OFF), the IC will reinitiate the start-up sequence. Brown-In Protection (I UV+) The VOLTAGE MONITOR pin features an input line undervoltage detection to limit the minimum start-up voltage detected through the V pin. This detection threshold will inhibit the device from starting at very low input AC voltage. Brown-Out Protection (I UV-) The V pin features a brown-out protection mode wherein the HiperPFS will turn-off when the V pin current is below the Line UV-threshold for a period exceeding the t REFRESH time period. In the event a single half-line cycle is missing (normal operating line frequency is 47 to 63 Hz) the brown-out protection will not be activated. The HiperPFS shutdown in effect gradually reduces the internal error-voltage to zero volts at rate of 1 V/ms Figure 8. (a) Frequency Variation Over Line Half-Cycle as a Function of Input Voltage (b) Frequency Variation Over Line Half-Cycle as a Function of Load. Figure 9. V OFF vs. VE and VOFF vs. Input Voltage. 0 45 90 135 180 120 230 VAC 180 VAC 135 VAC 115 VAC Peak Load 90 VAC 110 100 90 80 70 60 50 40 30 20 10 Line Conduction Angle (°C) 0 45 90 135 180 120 110 100 90 80 70 60 50 40 30 20 10 Line Conduction Angle (°C) 100% Peak Load 75% Peak Load VIN = 115 VAC 25% Peak Load 50% Peak Load Expected Frequency Range at Peak Rated Load |
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