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PFS7329H Datasheet(PDF) 9 Page - Power Integrations, Inc. |
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PFS7329H Datasheet(HTML) 9 Page - Power Integrations, Inc. |
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9 / 30 page  Rev. B 06/13 9 PFS7323-7329 www.powerint.com Figure 12. REFERENCE Pin Current Operating Range. D. Once the start-up sequence check has passed and the converter goes into soft-start and if PGT is shorted to SIGNAL GROUND pin, then the PG signal will toggle to the low state (internal MOSFET is ‘on’) when the output voltage reaches 85-100% of the set regulation threshold and will remain in this state until the output voltage reaches zero volt or conditions in A, B or C occur. E. Once the start-up sequence check has passed and the converter goes into soft-start and if PGT is open, then the PG signal will remain in the high-impedance state (internal MOSFET is ‘off’). Reference and Selectable Power Limit Besides the internal current reference source, the precision resistor on the REFERENCE pin also allows user selection between ‘full’ and ‘efficiency’ power limit for each device. The efficiency power mode will permit user selection of a larger device for a given output power requirement for increased conversion efficiency. In ‘full’ power mode the REFERENCE pin resistor is 24.9 k W ±1% and the ‘Efficiency’ power limit mode is selected with a 49.9 k W ±1% resistor. If the REFERENCE pin is shorted (to GROUND pin) or open circuited the IC will initiate a fast soft-shutdown and disable the power MOSFET and remain disabled until all the conditions for the start-up sequence are satisfied. The REFERENCE pin resistor value and power mode is latched at start-up. 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 < VFB < 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 VOLTAGE MONITOR pin current is above I V(OFF). In normal operation, if the current through the VOLTAGE MONITOR pin exceeds the I V(OFF) threshold for a duration exceeding t V(OFF), the IC will re-initiate 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 VOLTAGE MONITOR pin. This detection threshold will inhibit the device from starting at very low input AC voltage. Brown-Out Protection (I UV-) The VOLTAGE MONITOR pin features a brown-out protection mode wherein the HiperPFS will turn-off when the VOLTAGE MONITOR pin current is below the Line UV- threshold (I UV-) for a period exceeding the t BROWN-OUT 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-2 soft-shutdown in effect gradually reduces the internal error-voltage to zero volts at rate of 1 V/ms to decay the power MOSFET on-time to zero. At peak power (V E ~5 V) the shutdown time will be approximately 5 ms. The internal error-voltage is held at 0 V for as long as the input peak voltage is below the brown-in (I UV+) threshold. The internal error-voltage controlled slew to 0 V gradually reduces the switch on-time to zero to deplete energy stored in the boost choke as well as input EMI filter for power-down. Once the error-voltage reaches zero volts the controller is effectively in an off-state (gated by 5 ms timer) and will restart once all the conditions of soft-start are satisfied. At start-up and during soft-start the brown-out threshold (same as Line UV-) is reduced to I UV(SS) and brown-out timer is also extended to t UV(SS) (soft-start brown-out timer). Soft-start brown-out threshold (I UV(SS)) is reset to IUV- once the internal error-voltage has begun to fall (indicating the converter has reached steady-state output voltage regulation). The soft-start brown-out timer is reset to the normal brown-out timer once the internal error-voltage has begun to fall (indicating the converter has reached steady-state output voltage regulation) and the VOLTAGE MONITOR pin current exceeds I UV-. If the VOLTAGE MONITOR pin current is still below the I UV(SS) threshold after the end of the soft-start brown-out timer (t UV(SS)), then the converter will fail to start and initiate a soft-shutdown followed by a soft start-up sequence as described in flowchart in Figure 8. PI-6863-050313 ~170 VAC V IN ~140 VAC I V < ~48 µA I V > ~59 µA Figure 13. Line Dependent OCP. PI-6701-030212 Normal Range for ‘Efficiency Mode’ R = 49.9 kΩ Normal Range for ‘Full Mode’ R = 24.9 kΩ 30 μA 20 μA 25 μA 50 μA 40 μA 60 μA IC-OFF IC-OFF IC-OFF |
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