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IRS2166DSPBF Datasheet(PDF) 15 Page - International Rectifier |
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IRS2166DSPBF Datasheet(HTML) 15 Page - International Rectifier |
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15 / 20 page  IRS2166D(S)PbF www.irf.com Page 15 ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + + ⋅ ⋅ ⋅ ⋅ = 1475 51 . 0 2 1 PH T PH T T PH R R R R C f [Hz] (5) or ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − ⋅ ⋅ − ⋅ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − ⋅ ⋅ = 2892 02 . 1 1 2892 02 . 1 1 PH T T T PH T PH f C R R f C R [Ω] (6) Step 4: Program Preheat Time The preheat time is defined by the time it takes for the capacitor on pin CPH to charge up to 12 V. An internal current source of 3.6 µA (ICPH) flows out of pin CPH. The preheat time is therefore given as: 6 6 . 2 e C t PH PH ⋅ = [s] (7) or 6 385 . 0 − ⋅ = e t C PH PH [F] (8) Step 5: Program Maximum Ignition Current The maximum ignition current is programmed with the external resistor RCS and an internal threshold of 1.20 V. This threshold determines the over-current limit of the ballast, which can be exceeded when the frequency ramps down towards resonance during ignition and the lamp does not ignite. The maximum ignition current is given as: CS IGN R VCSTH I + = [A] (9) or IGN CS I VCSTH R + = [Ω] (10) PFC Design Equations Step1: Calculate PFC inductor value: VBUS P f VAC VAC VBUS L OUT MIN MIN MIN PFC ⋅ ⋅ ⋅ ⋅ ⋅ ⋅ − = 2 ) 2 ( 2 η [H] (1) where, VBUS = DC bus voltage MIN VAC = Minimum rms AC input voltage η = PFC efficiency (typically 0.95) MIN f = Minimum PFC switching frequency at minimum AC input voltage OUT P = Ballast output power Step 2: Calculate peak PFC inductor current: η ⋅ ⋅ ⋅ = MIN OUT PK VAC P i 2 2 [A] (2) Note: The PFC inductor must not saturate at PK i over the specified ballast operating temperature range. Proper core sizing and air-gapping should be considered in the inductor design. Step 3: Calculate maximum on-time: η ⋅ ⋅ ⋅ = 2 2 MIN PFC OUT ON VAC L P t MAX [s] (3) Step 4: Calculate maximum COMP voltage: 6 9 . 0 − = E t V MAX ON MAX COMP [V] (4) Step 5: Select zener diode DCOMP value: COMP D zener voltage ≈ MAX COMP V [V] (5) Step 6: Calculate resistor RSUPPY value: IQCCUV VAC R PK MIN SUPPLY 10 + = [Ω] (6) |
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