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UCC2819APWRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC2819APWRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 21 page UCC2819A UCC3819A SLUS579 − OCTOBER, 2003 8 www.ti.com APPLICATION INFORMATION The UCC3819A is based on the UCC3818 PFC preregulator. For a more detailed application information for this part, please refer to the UCC3818 datasheet product folder. The main difference between the UCC3818 and the UCC3819A is that the non-inverting input of the voltage error amplifier is made available to the user through an external pin (VAI) in the UCC3819A. The SS pin and function were eliminated to accommodate this change. The benefit of VAI pin is that it can be used to dynamically change the PFC output voltage based on the line voltage (RMS) level or other conditions. Figure 1 shows one suggested implementation of the tracking boost PFC converter as this approach is sometimes referred to. The VAI pin is tied to the VFF pin and hence output voltage scales up with the line voltage. The benefit of this approach is that at lower line voltages the output voltage is lower and that leads to smaller boost inductor value, lower MOSFET conduction losses and reduced component stresses. In order for this feature to work, the downstream converter has to operate over a wider input range. UDG−01008 1 11 7 16 GND DRVOUT R17 15 C3 C2 14 C1 13 C4 12 R1 R3 R2 R4 R5 C5 9 4 10 VREF VCC CT VAI RT VSENSE OVP/EN VREF VAOUT 3 8 2 VFF C6 C7 R7 6 5 R9 C8 R8 D6 R10 D5 R11 R12 R14 C13 C14 R13 IAC D2 D1 C12 VOUT + − PKLIMIT CAOUT CAI MOUT IAC VO UCC3819A VLINE VREF C9 R6 D3 Q1 F1 VO D4 R19 R20 R21 AC2 AC1 C15 VFF VCC (FROM BIAS SUPPLY) Figure 1. Suggested Implementation of UCC3819A in a Tracking Boost PFC Preregulator |
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