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ML4833CS датащи(PDF) 10 Page - Micro Linear Corporation |
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ML4833CS датащи(HTML) 10 Page - Micro Linear Corporation |
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10 / 13 page ![]() ML4833 10 A summary of the operating frequencies in the various operating modes is shown below. Operating Mode Operating Frequency [F(MAX) to F(MIN)] Preheat 2 Dimming Lock-out F(MIN) Dimming Control F(MIN) to F(MAX) 9 8 RX CX 6.8 + – 1.2/4.8 HEAT INHIBIT 0.625 RSET + – 1.2/6.8 – + 1.25V DIMMING LOCKOUT RX/CX INTERRUPT Q R S Figure 8. Lamp Preheat and Interrupt Timers LFB OUT is ignored by the oscillator until CX reaches 6.8V threshold. The lamps are therefore driven to full power and then dimmed. The CX pin is clamped to about 7.5V. 6.8 4.8 1.2 .65 0 >1.25 RX/CX HEAT DIMMING LOCKOUT INT INHIBIT Figure 9. Lamp Starting and Restart Timing TYPICAL APPLICATIONS Figure 10 shows a schematic for a dimming power-factor corrected 60W ballast, designed to operate two F32T8 fluorescent lamps connected in series. |
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