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ML4831 Datasheet(PDF) 7 Page - Micro Linear Corporation

Part # ML4831
Description  Electronic Ballast Controller
Download  14 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4831 Datasheet(HTML) 7 Page - Micro Linear Corporation

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ML4831
7
Figure 3 shows the output configuration for the
operational transconductance amplifiers.
CURRENT
MIRROR
IN
OUT
CURRENT
MIRROR
IN
OUT
gmVIN
io = gmVIN
IQ +
2
gmVIN
IQ –
2
Figure 3. Output Configuration
A DC path to ground or VCC at the output of the
transconductance amplifiers will introduce an offset error.
The magnitude of the offset voltage that will appear at the
input is given by VOS = io/gm. For a io of 1uA and a gm
of 0.08
µmhos the input referred offset will be 12.5mV.
Capacitor C1 as shown in Figure 2 is used to block the
DC current to minimize the adverse effect of offsets.
Slew rate enhancement is incorporated into all of the
operational transconductance amplifiers in the ML4831.
This improves the recovery of the circuit in response to
power up and transient conditions. The response to large
signals will be somewhat non-linear as the
transconductance amplifiers change from their low to high
transconductance mode. This is illustrated in Figure 4.
VIN Differential
Linear Slope Region
0
iO
Figure 4. Transconductance Amplifier Characteristics
BALLAST OUTPUT SECTION
The IC controls output power to the lamps via frequency
modulation with non-overlapping conduction. This means
that both ballast output drivers will be low during the
discharging time tDIS of the oscillator capacitor CT.
OSCILLATOR
The 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.
17
+
1.25/3.75
8
C(T)
VREF
ICHG
VREF
CONTROL
R(T)/C(T)
R(T)
5 mA
CLOCK
C(T)
VTH = 3.75V
VTL = 1.25V
tDIS
tCHG
Figure 5. Oscillator Block Diagram and Timing
The oscillator frequency is determined by the following
equations:
F
tt
OSC
CHG
DIS
=
+
1
(3)
and
tR C In
VI
R
V
VI
R
V
CHG
T T
REF
CH
T
TL
REF
CH
T
TH
=
+−
+−


(4)


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