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ML4835CS Datasheet(PDF) 1 Page - Micro Linear Corporation |
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ML4835CS Datasheet(HTML) 1 Page - Micro Linear Corporation |
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1 / 17 page  July 2000 PRELIMINARY ML4835* Compact Fluorescent Electronic Dimming Ballast Controller 1 GENERAL DESCRIPTION The ML4835 is a complete solution for a dimmable or a non-dimmable, high power factor, high efficiency electronic ballast especially tailored for a compact fluorescent lamp (CFL). The Bi-CMOS ML4835 contains controllers for “boost” type power factor correction as well as for a dimming ballast with end-of-lamp life detection. The PFC circuits uses a new , simple PFC topology which requires only one loop for compensation. In addition, this PFC can be used with either peak- or average-current mode. This system produces a power factor of better than 0.99 with low input current THD. The ballast controller section provides for programmable starting sequence with individual adjustable preheat and lamp out-of-socket interrupt times. The ML4835 provides a shut down for both PFC and ballast controllers in the event of end-of-life for the CFL. BLOCK DIAGRAM FEATURES s Power detect for end-of-lamp-life detection s Low distortion , high efficiency continuous boost, peak or average current sensing PFC section s Leading- and trailing-edge synchronization between PFC and ballast s One to one frequency operation between PFC and ballast s Programmable start scenario for rapid/instant start lamps s Triple frequency control network for dimming or starting to handle various lamp sizes s Programmable restart for lamp out condition to reduce ballast heating. s Internal over-temperature shutdown s PFC over-voltage comparator eliminates output “runaway” due to load removal s Low start-up current; < 0.55mA 7 RSET 9 RT/CT 8 RT2 13 CRAMP 4 PIFBO 3 PIFB 2 PEAO 1 PVFB/OVP 12 PWDET 10 INTERRUPT 5 LAMP FB 6 LEAO 17 OUT A 16 OUT B 18 PFC OUT 15 PGND 11 RX/CX 19 VCC 20 REF 14 AGND OUTPUT DRIVERS PRE-HEAT AND INTERRUPT TIMERS LAMP OUT DETECT AND AUTOMATIC LAMP RESTART UNDER-VOLTAGE AND THERMAL SHUTDOWN END-OF-LAMP DETECT AND POWER SHUTOFF ANTI-FLASH COMPENSATION AND POWER DIMMING LEVEL INTERFACE CONTROL AND GATING LOGIC THREE-FREQUENCY CONTROL SEQUENCER VCO VARIABLE FREQUENCY OSCILLATOR POWER FACTOR CONTROLLER (* Indicates Part is End Of Life as of July 1, 2000) |
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