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IR2159 Datasheet(PDF) 22 Page - International Rectifier |
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IR2159 Datasheet(HTML) 22 Page - International Rectifier |
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22 / 25 page  IR2159/IR21591 (S) 22 www.irf.com Should the peak voltage on pin CS exceed 1.6V at any time during dimming, the IR2159 enters FAULT mode and the high and low-side driver outputs, HO and LO, are both turned off . Cycling the supply voltage on VCC below or the voltage on pin SD will reset the IR2159 to preheat (PH) mode (see STATE DIAGRAM). Ballast Design Lamp Requirements Before selecting component values for the ballast output stage and the programmable inputs of the IR2159, the following lamp requirements must first be defined: Variable Description Units ph I Filament pre-heat current Arms ph t Filament pre-heat time s max ph V Maximum lamp pre-heat voltage Vpp ign V Lamp ignition voltage Vpp % 100 P Lamp power at 100% brightness W % 100 V Lamp voltage at 100% brightness Vpp % 1 P Lamp power at 1% brightness W % 1 V Lamp voltage at 1% brightness Vpp min Cath I Minimum cathode heating current Arms Table I, Typical lamp requirements Ballast Output Stage The components comprising the output stage are selected using a set of equations. Different ballast operating frequencies and their respective voltages and currents are calculated. The inductor and capacitor values are obtained using equations (2) through (7). The results of these equations reveal the location of each operating frequency and the corresponding voltages and currents. For a given L, C, DC bus voltage, and pre-heat current, the resulting voltage over the lamp during pre-heat is given as: The resulting operating frequency during pre-heat is given as: ph ph ph CV I f π 2 = [Hz] (3) The resulting operating frequency during ignition is given as: LC V V f ign DC ign π π 4 1 2 1 + = [Hz] (4) The total load current during ignition is given as: If CV ign ign ign = 2 π [App] (5) π π DC ph DC ph V I C L V V 2 8 2 2 1 2 2 − + = (2) |
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