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IR21592 Datasheet(PDF) 5 Page - International Rectifier |
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IR21592 Datasheet(HTML) 5 Page - International Rectifier |
5 / 12 page 5 www.irf.com Power Factor Correction The power factor correction section consists of the L6561D Power Factor Controller IC (IC1), MOSFET M1, inductor L2, diode D2, capacitor C8 and additional biasing, sensing and compensation compo- nents (see schematic diagram). This is a boost topology designed to step-up and regulate the output DC bus voltage while drawing sinusoidal current from the line (low THD) which is “in phase” with the AC input line voltage (HPF). The design of the power factor correction section was taken from the L6561D data sheet and information on the operation and design considerations for the L6561D are contained therein. Ballast Control The ballast control section is built around the IR21592 Ballast Control IC, IC2 of the Demo board. The IR21592 contains an oscillator, a high voltage half-bridge gate driver, an analog dimming inter- face and lamp fault protection circuitry. A block diagram of the IR21592 IC is shown in figure 1 and a state diagram of the IR21592 is shown in figure 2. Figure 1: IR21592 Block Diagram LEVEL SHIFT PULSE FILTER & LATCH 3 5.1V 4 6 10V 2 1.3uA 5 7 8 5.1V 1.0V CPH DIM MAX MIN FMIN IPH VCO Q S R2 Q R1 Q T RQ 16 14 15 VS HO VB 13 11 12 COM LO VCC 15.6V 10 1.6V CS UNDER- VOLTAGE DETECT 1 VDC I CT I CT 15uA 1uA 60uA CT I FMIN Q S RQ Q S RQ I DIM 5.1V 1 0 VCC 400ns DELAY 5.1V 3V R FB V ERR REF FB CT OVER- TEMP DETECT IGN DET Q S R Q 9 SD 2.0V 7.6V Q S RQ I DT I CT + I DIM/5 4/R FMIN 1/R FMIN 0.1/R FMIN 0.1/R FMIN |
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