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ML4835CS Datasheet(PDF) 8 Page - Micro Linear Corporation

Part # ML4835CS
Description  Compact Fluorescent Electronic Dimming Ballast Controller
PDF  17 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4835CS Datasheet(HTML) 8 Page - Micro Linear Corporation

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ML4835
8
Setting minimum input voltage for output regulation can
be achieved by selecting CRAMP as follows for peak
current mode:
C
PEAO
K
DTs
t
P
V
VV
L
DTs
R
RAMP
MAX
OUT
IN
OUT
IN
SENSE
=-
-
-
-




-

!
"
$##
´
22
1
1
22
2
18
()
()
D
:?
(1)
And for average current mode:
C
PEAO
K
DTs
t
P
V
V
L
DTs
R
RAMP
MAX
OUT
IN
OUT
SENSE
=-
-
- 


 -

!
"
$##
´
22
1
1
2
2
18
()
()
D
:?
(1a)
Where
Dt is the dead time.
OVERVOLTAGE PROTECTION AND INHIBIT
The OVP pin serves to protect the power circuit from
being subjected to excessive voltages if the load should
change suddenly (lamp removal). A divider from the high
voltage DC bus sets the OVP trip level. When the voltage
on PVFB/OVP exceeds 2.75V, the PFC transistor are
inhibited. The ballast section will continue to operate.
TRANSCONDUCTANCEAMPLIFIERS
The PFC voltage feedback amplifier is implemented as an
operational transconductance amplifier. It is designed to
have low small signal forward transconductance such that
a large value of load resistor (R1) and a low value
ceramic capacitor (<1µF) can be used for AC coupling
FUNCTIONAL DESCRIPTION (Continued)
Figure 5. Compensation Network
Figure 6. Output Configuration
Figure 7. Transconductance Amplifier Characteristics
–
+
1
2.5V
PVFB/OVP
R1
C1
C2
CURRENT
MIRROR
IN
OUT
CURRENT
MIRROR
IN
OUT
gmVIN
io = gmVIN
IQ +
2
gmVIN
IQ –
2
VIN DIFFERENTIAL
LINEAR SLOPE REGION
0
iO
Figure 4. Simplified Model of ML4835 EOL Functionality
ML4835
POWER LEVEL
TRIP POINT
POWER DETECT
POWER SHUTOFF



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