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| Renesas PFC Control IC for Digital-TV R2A20111 Features April 2010 VCC SS EO FB IAC PFC-ON CT RT 1. Continuous conduction mode is suitable for the system with large and high frequency variation of current. 2. Easy design by separate current terminal. 3. Hold function countermeasure to AC temporary blackout. It is possible to set no soft start time by chip capacitor. 4. Feed back loop detector. 5. Soft start period become short by quick soft start function. 6. Improve the load regulation by gm Amp at feed back Amp. OUT GND DELAY CGND CAI VREF CAO CLIMIT DIP16 or SOP16 1. Continuous conduction mode suitable for the system Input average current Input voltage 2. Easy design by separate current terminal Conventional R2A20111 V-AMP FB Multi CS C-AMP C-limiter EO CAI VREF CLIMIT C-limiter Multi C-AMP Constant power limiter Advantages Weaknesses * Small radiation noise * A little bit complex * Small peak current circuit. * Non-influenced of current change. Continuous conduction mode Choke coil current * Simple circuit * Large radiation noise * Large peak current * Large choke coil Critical conduction mode (Discontinuous) lout change case In case of continuous current mode, not so much change peak current. In case of critical current mode, the peak current is so large. Large current change Possible to set no coil vibration at start up and current limit. 4. Feed back loop detector Built in over voltage protection. And feedback loop absence detection can stop output pulse and PG. Therefore bulk capacitor & FET is not broken by R2A20111. Conventional Bulk voltage R2A20111 Bulk voltage The feed back loop disconnection is detected, and stop pulse! 3. Hold function countermeasure to AC temporary blackout AC input Hold counter Hold timer (Adjustable) AC blackout cut FB In case of feed back loop down, bulk voltage rise up to abnormal voltage. And cut capacitor is broken. Conventional IC w/o this function FB Prevention from destruction of bulk capacitor and power MOSFET! R2A20111 Bulk voltage FET OUT (R2A20111) FET OUT (Conventional IC) IC operation does not stop for set period, therefore recovery is faster, available in the area where power supply is not stable. 6. Improve load regulation by gm Amp at feed back Amp In voltage feedback Amp case, feedback current flow influence to load regulation. Conventional R2A20111 VOUT 5. Soft start period become short by quick soft start functionVOUT Soft start voltage Triangle wave Css=4.7uF Improved time=4.7uFX1V/25uA=188ms. R2 R1 Renesas General soft start period Error Amp VEO VREF R2 R1 FB Error Amp VREF Example of Application Circuit Small & high reliability systems * Target power range is over 300V. * Realize high reliability on PFC block by R2A20111 and coordinate next stage by P.G. * Realize small transformer and high efficiency by using half bridge topology by HA16150. + 380V 12V R2A20111 HA16150 RJK5015 RJK5015 Down sizing trance 5V HA16116 Possible to use 500V type FET Renesas Electronics URL http://www.renesas.com/pfcic (c)2010. Renesas Electronics Corporation, All rights reserved. |
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