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ML4831, ML4831CO, ML4831CP

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Info of ML4831
Info of ML4831CO
Info of ML4831CP

ML4831, ML4831CO, ML4831CP Selling Leads, Datasheet

MFG:ML Package Cooled:DIP D/C:DIP

ML4831, ML4831CO, ML4831CP Datasheet download

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Part Number: ML4831

MFG: ML

Package Cooled: DIP

D/C: DIP

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ML4831 General Description

The ML4831 is a complete solution for a dimmable, high power factor, high efficiency electronic ballast. Contained in the ML4831 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 ML4831 to increase system noise immunity by using a high amplitude oscillator, and a current fed multiplier. An over-voltage protection comparator inhibits the PFC section in the event of a lamp out or lamp failure condition.

The ballast section provides for programmable starting scenarios with programmable preheat and lamp out-ofsocket interrupt times. The IC controls lamp output through either frequency modulation using lamp current feedback.

The ML4831 is designed using Micro Linear's Semi- Standard tile array technology. Customized versions of this IC, optimized to specific ballast architectures can be made available. Contact Micro Linear or an authorized representative for more information.

ML4831 Maximum Ratings

Supply Current (I_CC) ...................................................75mA
Output Current, Source or Sink (Pins 13,14,15)
DC ............................................................................ 250mA
Output Energy (capacitive load per cycle)................. 1.5 mJ
Gain Modulator I(SINE) Input (Pin 3) ......................... 10 mA
Amplifier Source Current (Pin 6, 20) .......................... 50 mA
Analog Inputs (Pins 1, 5, 10, 11, 19) ...... 0.3V to VCC 2V
Pin 4 input voltage .............................................. 3V to 5V
Junction Temperature .............................................. 150°C
Storage Temperature Range .................. 65°C to +150°C
Lead Temperature (Soldering 10 Sec.) .................. +260°C
Thermal Resistance (_JA)
Plastic DIPP ......................................................... 65°C/W

ML4831 Features

Complete Power Factor Correction and Dimming Ballast Control on one IC
Low Distortion, High Efficiency Continuous Boost, Average Current sensing PFC section
Programmable Start Scenario for Rapid or Instant Start Lamps
Lamp Current feedback for Dimming Control
Variable Frequency dimming and starting
Programmable Restart for lamp out condition to reduce ballast heating
Over-Temperature Shutdown replaces external heat sensor for safety
PFC Over-Voltage comparator eliminates output "runaway" due to load removal
Large oscillator amplitude and gain modulator improves noise immunity

ML4831 Connection Diagram

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