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KA7543D Datasheet(PDF) 9 Page - Fairchild Semiconductor |
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KA7543D Datasheet(HTML) 9 Page - Fairchild Semiconductor |
9 / 16 page KA7543 9 Abnormal Protection Figure 7. Abnormal Protection Circuit The abnormal protection is similar to the over current protection, but it is a protection that detects abnormal connection of lamps. The abnormal protection circuit works when the Vab pin voltage is higher than 2V. The abnormal protection is latched using a flip-flop and the protection is reset when the ballast system restarts. Lamp Selector Stage Figure 8. Lamp Selector Stage If the Vld pin voltage is between 1V and 3V, it means that there is one lamp connected and if the Vld pin voltage is over 3V, it is two lamps condition. The feedback reference voltage of the two lamps condition is twice that of one lamp condition. - + Protection reset 2V 3pF Abnormal protection 30k Ω + - S Q R Q Vab 7 From no lamp To output 0.7V Vct 6 8 + - - + 3V 1V 5pF Selecter No-lamp pretection 5k Ω Vr ir is-id Gm + - 1/2 Vfb Vld Cc 30k Ω |
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