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BL8305A Datasheet(PDF) 5 Page - SHANGHAI BELLING CO., LTD. |
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BL8305A Datasheet(HTML) 5 Page - SHANGHAI BELLING CO., LTD. |
5 / 8 page ![]() BL8305A BL8305A BL8305A BL8305A BALLAST CONTROL IC BALLAST CONTROL IC BALLAST CONTROL IC BALLAST CONTROL IC http://www.belling.com.cn - 5 - 8/28/2006 Total 8 Pages 2 1 2 7 * 249 . 0 10 203 . 0 p p p p preheat R R R C T + − × × = sec。Preheat frequency is set by the voltage(VRpre) at pin3, the preheat frequency is: run Rpre pre f V f × = 6 . 1 , 35 . 6 2 1 2 Pr × + = pre pre pre e R R R R V . The run mode oscillating frequency is determined by the timing resistor RT and timing capacitor Ct, t t run C R f × = 374 . 0 。 Drive BHF or MHF Drive BHF or MHF Drive BHF or MHF Drive BHF or MHF When driving BHF, a transformer with two secondary magnifies the output current of BL8305A and the half-bridge is drive by the magnified current. The output voltage of half-bridge is divided by the resistor RHV and an internal resistor about 40Kohm in the PIN HV and the BL8305A senses this waveform, and automatically adjusts the BCI. The BCI Auto-Adj is enabled at about 1 sec after the ignition. As showing in the figure, if BCI is appropriate, the output of BL8305A will be remain as the black line; if BCI is low, the output of BL8305A will be increase as the dashed line; if BCI is over driving, the output of BL8305A will be decrease as the dashdotted line. |
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