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ML4830 Datasheet(PDF) 1 Page - Micro Linear Corporation

Part # ML4830
Description  Electronic Ballast Controller
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4830 Datasheet(HTML) 1 Page - Micro Linear Corporation

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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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