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IR21592 Datasheet(PDF) 9 Page - International Rectifier |
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IR21592 Datasheet(HTML) 9 Page - International Rectifier |
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9 / 26 page  IR21592/IR21593(S) &(PbF) www.irf.com 9 External Components Selection Procedure (Note: Please refer to "Typical Connection" diagram, page 1) Calculate RCS PK IGN CS I R 6 . 1 = RCS sets the maximum ignition current which corresponds to the maximum ignition voltage across the lamp. RCS IIGN VIGN Select RFMIN Use Graph 1 or Graph 2 The minimum operating frequency must be lower than f100% of fIGN (whichever is lower). RFMIN also programs IMIN and IIPH, so RFMIN must be set first. RFMIN fMIN BEGIN Calculate RPULL-UP QCCUV ON TURN UP PULL I VAC R − − = Set RVAC and RVDC such that the voltage on pin VDC will exceed 5.1 volts at the desired line turn-on voltage. RVDC VACTURN-ON Calculate RVDC O N TUR N VA C O N TUR N VD C VAC R VAC R − − − = 1 . 5 1 1 . 5 The voltage at pin IPH is the reference for amplitude current control during preheat mode. RIPH must be set after RFMIN. RIPH IPH VPH Select & Calculate RIPH Use Graph 8 to find IIPH, then calculate RIPH: IP H C S P H IP H I R I R PK ⋅ = Calculate CCPH () PH CPH t e C 7 6 . 2 − = During preheat, an internal 1.3 µA current source at pin CPH charges external capacitor CCPH. Preheat mode ends when VCPH exceeds 5.1 volts. CCPH tPH Calculate ϕMIN (Equations 8 & 9) RMIN sets the lower phase boundary corresponding to minimum lamp power when VDIM = 0 volts. RMIN must be set after RFMIN. RMIN ϕMIN PLAMP Calculate RMAX Use Equation 15 RMAX ϕMAX PLAMP RMAX sets the upper phase boundary corresponding to maximum lamp power when VDIM = 5 volts. RMAX must be set after RFMIN and RMIN. Find VMIN (Graph 9) Find IMIN (Graph 3) MIN MIN MIN I V R = Calculate RMIN |
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