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ML4832CS bảng dữ liệu(PDF) 6 Page - Micro Linear Corporation

tên linh kiện ML4832CS
Giải thích chi tiết về linh kiện  Electronic Dimming Ballast Controller
PDF  15 Pages
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nhà sản xuất  MICRO-LINEAR [Micro Linear Corporation]
Trang chủ  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4832CS bảng dữ liệu(HTML) 6 Page - Micro Linear Corporation

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ML4832
6
FUNCTIONAL DESCRIPTION
OVERVIEW
The ML4832 consists of an average current controlled
continuous boost power factor front end section with a
flexible ballast control section. Start-up and lamp-out retry
timing are controlled by the selection of external timing
components, allowing for control of a wide variety of
different lamp types. The ballast section controls the lamp
power using frequency modulation (FM) with additional
programmability provided to adjust the VCO frequency
range. This allows for the IC to be used with a variety of
different output networks.
POWER FACTOR SECTION
The ML4832 power factor section is an average current
sensing boost mode PFC control circuit which is
architecturally similar to that found in the ML4821. For
detailed information on this control architecture, please
refer to Application Note 16 and the ML4821 data sheet.
Figure 1. ML4832 Block Diagram
GAIN MODULATOR
The ML4832 gain modulator provides high immunity to
the disturbances caused by high power switching. The
rectified line input sine wave is converted to a current via
a series resistor. In this way, small amounts of ground noise
produce an insignificant effect on the reference to the
PWM comparator.
The output of the gain modulator appears on the positive
terminal of the IA amplifier to form the reference for the
current error amplifier. Please refer to Figure 1.
V
I
mA
MUL
SINE
VEA
V
=
×−07
34
.
.
16
(1)
where: ISINE is the current in the dropping resistor,
VEA is the output of the error amplifier (Pin 1).
The output of the gain modulator is limited to 1.0V.
7
RSET
RX/CX
VCC
VREF
GND
IA OUT
IA +
–VMUL+
ISINE
EA OUT
EA –/OVP
10
16
17
11
2
4
3
1
18
OUT B
13
+
–
+
–
+
–
–
+
–
+
2.5V
2.5V
VREF
–1V
PREHEAT
TIMER
VARIABLE
FREQUENCY
OSC
UNDER-VOLTAGE
AND THERMAL
SHUTDOWN
–
+
S
R
Q
T
Q
Q
P GND
12
OUT A
14
PFC OUT
15
RT/CT
8
INTERRUPT
9
LFB OUT
6
LAMP FB
5
–
+
2.75V
7k
PWM (PFC)
OVP
7k
GAIN
MODULATORS



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