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ML4830 Datasheet(PDF) 1 Page - Micro Linear Corporation |
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ML4830 Datasheet(HTML) 1 Page - Micro Linear Corporation |
1 / 15 page ![]() 1 March 1997 ML4830* Electronic Ballast Controller GENERAL DESCRIPTION The ML4830 is a complete solution for a dimmable, high power factor, high efficiency electronic ballast. Contained in the ML4830 are controllers for “boost” type power factor correction as well as for a dimming ballast. The Power factor circuit uses the average current sensing method with a gain modulator and over-voltage protection. This system produces power factors of better than 0.99 with low input current THD at > 95% efficiency. Special care has been taken in the design of the ML4830 to increase system noise immunity by using a high amplitude oscillator, and a gain modulator. An over- voltage protection comparator stops the PFC section in the event of sudden load decrease. The ballast section provides for programmable starting scenarios with programmable preheat and lamp out-of- socket interrupt times. The IC controls lamp output through either frequency or Pulse Width control using lamp current feedback. The ML4830 is designed using Micro Linear‘s Semi- Standard tile array methodology. Customized versions of this IC, optimized to specific ballast architectures can be made available. Contact Micro Linear or an authorized representative for more information. FEATURES s Complete Power Factor Correction and Dimming Ballast Control on one IC s Low Distortion, High Efficiency Continuous Boost, Average Current sensing PFC section s Programmable Start Scenario for Rapid or Instant Start Lamps s Selectable Variable Frequency dimming and starting s Programmable Restart for lamp out condition to reduce ballast heating s Over-Temperature Shutdown replaces external heat sensor for safety s PFC Over-Voltage comparator eliminates output “runaway” due to load removal s Large oscillator amplitude and gain modulator improves noise immunity *This Part Is End Of Life As Of August 1, 2000 BLOCK DIAGRAM 7 R(SET) OSCILLATOR 9 R(T)/C(T) 12 R(X)/C(X) PRE-HEAT AND INTERRUPT TIMERS PWM OR FREQUENCY MODULATOR 10 INTERRUPT 11 OVP/INHIBIT POWER FACTOR CONTROLLER UNDER-VOLTAGE AND THERMAL SHUTDOWN OUTPUT DRIVERS 2 IA OUT 1 IA– 4 IA+/I(LIM) 3 I(SINE) 20 EA OUT 19 EA– GND 13 PFC OUT 16 VREF 18 VCC 17 OUT B 14 OUT A 15 LFB OUT 6 LAMP F.B. 5 MODE 8 |
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