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ML4831 Datasheet(PDF) 9 Page - Micro Linear Corporation |
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ML4831 Datasheet(HTML) 9 Page - Micro Linear Corporation |
9 / 14 page ML4831 9 10 9 R(X) C(X) 6.8 + – 1.2/3.4 HEAT INHIBIT 0.625 R(SET) + – 1.2/6.8 – + VREF DIMMING LOCKOUT R(X)/C(X) INT Q R S Figure 7. Lamp Preheat and Interrupt Timers LFB OUT is ignored by the oscillator until C(X) reaches 6.8V threshold. The lamps are therefore driven to full power and then dimmed. The C(X) pin is clamped to about 7.5V. 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) 6.8 3.4 1.2 .65 0 7.5 R(X)/C(X) HEAT DIMMING LOCKOUT INT INHIBIT Figure 8. Lamp Starting and Restart Timing |
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