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PFS7323L Datasheet(PDF) 4 Page - Power Integrations, Inc. |
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PFS7323L Datasheet(HTML) 4 Page - Power Integrations, Inc. |
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4 / 30 page  Rev. B 06/13 4 PFS7323-7329 www.powerint.com Figure 3. Functional Block Diagram. Functional Description The HiperPFS-2 is a variable switching frequency boost PFC solution. More specifically, it employs a constant amp-second on-time and constant volt-second off-time control algorithm. This algorithm is used to regulate the output voltage and shape the input current to comply with regulatory harmonic current limits (high power factor). Integrating the switch current and controlling it to have a constant amp-sec product over the on-time of the switch allows the average input current to follow the input voltage. Integrating the difference between the output and input voltage maintains a constant volt-second balance dictated by the electro-magnetic properties of the boost inductor and thus regulates the output voltage and power. More specifically, the control technique sets constant volt- seconds for the off-time (t OFF). The off-time is controlled such that: # VV tK OINOFF 1 -= ^h (1) Since the volt-seconds during the on-time must equal the volt-seconds during the off-time, to maintain flux equilibrium in the PFC choke, the on-time (t ON) is controlled such that: # Vt K IN ON 1 = (2) The controller also sets a constant value of charge during each on-cycle of the power MOSFET. The charge per cycle is varied gradually over many switching cycles in response to load changes so it can be regarded as substantially constant for a half line cycle. With this constant charge (or amp-second) control, the following relationship is therefore also true: # It K IN ON 2 = (3) Substituting t ON from (2) into (3) gives: IV K K IN IN 1 2 # = (4) PI-6697-050312 + - BIAS POWER (VCC) BOOST DIODE CATHODE (K) DRAIN (D) SOURCE (S) GROUND (G) POWER GOOD (PG) POWER GOOD THRESHOLD (PGT) FEEDBACK (FB) COMPENSATION (C) REFERENCE (R) VCC+ INTERNAL SUPPLY REFERENCE AND BAND GAP SOFT- START VOLTAGE MONITOR (V) MON INPUT LINE INTERFACE Peak Detector IVPK IV Input UV (IUV+/IUV-) + - + - + - + - FBOV ~(VO-VIN) Internal Reference VREF Transconductance Error-Amplier FEEDBACK/ COMPENSATION Pin OV/UV senseFET Power MOSFET C-UV/OFF Comparator IREF IV M OFF (IREF - IV) CINT CUV/ FBOFF/ COFF IOCP VREF VPG(H) IPGT FBCOV FBCUV + + + - + - + - + - + - FBCUV FBCOV FBON/ FBOFF V FB VCC Buffer and De-Glitch Filter CUV/COFF VFB VPG(H) VCC IPGT IOCP IS VOFF VE CINT IVPK V E PON × MON × IS VCC Latch Comparator INPUT UV OTP SOA Comparator 1 kHz Filter Frequency Slide mON is the switch current sense scale factor which is a function of the peak input voltage OCP LEB Feedback-OVP/OFF Comparator VOFF is a function of the error-voltage (VE) and is used to reduce the average operating frequency as a function of output power FBGM FBGM |
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