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ML4833CS Datasheet(PDF) 7 Page - Micro Linear Corporation

Part # ML4833CS
Description  Electronic Dimming Ballast Controller
PDF  13 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4833CS Datasheet(HTML) 7 Page - Micro Linear Corporation

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ML4833
7
Figure 2. ML4833 PFC Controller Section
+
–
–
+
L
A
M
P
L
A
M
P
LAMP
NETWORK
INVERTER
RA
SW2
L
SW1
RSENSE
SINE
RB
VOUT
EMI
FILTER
14
2
PIFB
CRAMP
C1
C2
R1
CRAMP
OUT A
PVFB/OVP
18
–A
S
VREF1
OSC
SINE
RAMP
CLK
PFC OUT
CLK
RQ
V TO I
PEAO
10
PEAO
1
TRANSCONDUCTANCE AMPLIFIERS
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
(C1) in the frequency compensation network. The
compensation network shown in Figure 3 will introduce a
zero and a pole at:
f
RC
f
RC
ZP
==
1
2
1
2
11
1 2
ππ
(2)
–
+
18
2.5V
PVFB/OVP
R1
C1
C2
Figure 3. Compensation Network



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