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ML4830 Datasheet(PDF) 7 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) 7 Page - Micro Linear Corporation

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ML4830
7
Mode
Pin 8
Definition
VCO
GND
Frequency Modulation
VCO-O
OPEN
Overlapping VCO F.M.
PWM
VREF
Pulse Width Modulation
Table 1. ML4830 Operating Modes
OSCILLATOR
In Table 1 above, the two VCO frequency ranges are
controlled by the output of the LFB amplifier (Pin 6). As
lamp current decreases, Pin 6 rises in voltage, causing the
C(T) charging current to decrease, thereby causing the
oscillator frequency to decrease. Since the ballast output
network attenuates high frequencies, the power to the
lamp will be increased.
In PWM Mode, ICHG is 0 so the oscillator’s frequency is
set per (1) below.
18
+
1.25/3.75
9
C(T)
R(T)
VREF
ICHG
VREF
CONTROL
R(T)/C(T)
5 mA
CLOCK
C(T)
VTH
VTL
tDIS
tCHG
Figure 2. Oscillator Block Diagram and Timing
Also, in both VCO modes, the when LFB OUT is high,
ICHG = 0 and the minimum frequency occurs. The
charging current varies according to two control inputs to
the oscillator:
1. The output of the preheat timer
2. The voltage at Pin 6 (lamp current output)
In preheat condition, charging current is fixed at
I
R SET
CHG PREHEAT
()
.
()
= 25
(1)
In running mode, charging current decreases as the VPIN7
rises from 0V to VOH of trhe LAMP FB amplifier. The
highest frequency will be attained when ICHG is highest,
which is attained when VPIN6 is at 0V:
I
R SET
CHG( )
()
0
5
=
(2)
The oscillator frequency is determined by the following
equations:
F
tt
OSC
CHG
DIS
=
+
1
(3)
and
tR C In
IR
IR
CHG
T T
CHG
T
CHG
T
=
+
+


625
375
.
.
(4)
The oscillator’s minimum frequency is set when ICHG = 0
where:
F
RC
OSC
TT
×
1
051
.
(5)
This assumes that tCHG >> tDIS.
Highest lamp power, and lowest output frequency are
attained when VPIN6 is at its maximum output voltage
(VOH).
In this condition, the minimum operating frequency of the
ballast is set per (5) above.
For the IC to be used effectively in dimming ballasts with
higher Q output networks a larger CT value and lower RT
value can be used, to yield a smaller frequency excursion
over the control range (VPIN6). The discharge current is set
to 5mA. Assuming that IDIS >> IRT:
tC
DIS VCO
T
() ≅×
490
(6)


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