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ML4833CS Datasheet(PDF) 1 Page - Micro Linear Corporation |
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ML4833CS Datasheet(HTML) 1 Page - Micro Linear Corporation |
1 / 13 page July 2000 PRELIMINARY ML4833* Electronic Dimming Ballast Controller GENERAL DESCRIPTION The ML4833 is a complete solution for a dimmable or a non-dimmable, high power factor, high efficiency electronic ballast. The BiCMOS ML4833 contains controllers for “boost” type power factor correction as well as for a dimming ballast. The ML4833 was designed to minimize the number of external components required to build an electronic ballast. The PFC circuit uses a new, simple PFC topology which requires only one loop for compensation. This system produces a power factor of better than 0.99 with low input current THD. An overvoltage protection comparator inhibits the PFC section in the event of a lamp out or lamp failure condition. The ballast controller section provides for programmable starting sequence with individually adjustable preheat and lamp out-of-socket interrupt times. The IC controls lamp output power through feedback. The ML4833 provides a power down input which reduces power to the lamp, for GFI, end of life, etc. FEATURES s Complete power factor correction and dimming ballast control in one IC s Low distortion, high efficiency continuous boost, peak current sensing PFC section s Programmable start scenario for rapid or instant start lamps s Lamp current feedback for dimming control s Variable frequency dimming and starting s Programmable restart for lamp out condition to reduce ballast heating s Internal over-temperature shutdown replaces external heat sensor s PFC overvoltage comparator eliminates output “runaway” due to load removal s Low start-up current <0.5mA s Power reduction pin for end of life and GFI detectors 1 BLOCK DIAGRAM 6 RSET VARIABLE FREQUENCY OSCILLATOR 7 RT /CT 9 RX/CX PRE-HEAT AND INTERRUPT TIMERS CONTROL & GATING LOGIC 3 PDWN 10 CRAMP POWER FACTOR CONTROLLER UNDER-VOLTAGE AND THERMAL SHUTDOWN OUTPUT DRIVERS 2 PIFB 1 PEAO 18 PVFB/OVP VREF 17 PFC OUT 15 GND 11 VCC 16 PGND 12 OUT B 13 OUT A 14 LFB OUT 5 LAMP FB 4 INTERRUPT 8 (* Indicates part is End Of Life as of July 1, 2000) |
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