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参数资料
| 型号： | LX1562IDM-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A POWER FACTOR CONTROLLER, PDSO8 |
| 封装： | ROHS COMPLIANT, PLASTIC, SOIC-8 |
| 文件页数： | 9/25页 |
| 文件大小： | 430K |
| 代理商： | LX1562IDM-TR |
SECOND-GENERATION POWER FACTOR C ONTROLLER
LX1562/1563
PRODUCT DA T ABOOK 1996/1997
17
Copyright 1996
Rev. 1.3a
8/30
P RODUCTION
D ATA
S HEET
APPLICATION INFORMA TION
TYPICAL APPLICATION
The application circuit shown in Figure 31 uses the LX1562 as the
controller to implement a boost type power factor regulator. The
I.C. controls the regulator, such that the inductor current is always
operating in a discontinuous conduction mode with no current
gaps. This mode of operation has several advantages over the
fixed frequency discontinuous conduction mode: 1) The switch-
ing frequency adjusts itself to the AC line envelope, causing a
sinusoidal current draw, 2) Since there is no current gap between
the switching cycles, the inductor voltage does not oscillate,
causing less radiated noise, 3) The lower peak inductor current
causes less power dissipation in the power MOSFET.
A set of formulas have been derived specifically for this mode,
and are used throughout the design procedure. An example with
the following specifications for the boost converter is given as:
Input Voltage Range
-
100 to 130V RMS
Output Power
-
80W
Efficiency
-
95% at full load
Power Factor
-
> 0.99 at full load
Total Harmonic Distortion
-
< 10% at full load
followed by a step by step design procedure which walks through
component selection.
VIN
IDET
OUT
COMP
INV
C.S.
GND
MULT
LX1562
1RF730
230V
FLOURESCENT
LAMP
BALLAST
IN
5
8
7
2
1
4
6
3
EMI
FILTER
120V
AC
22k
100k
W
2.2M
1%
1F
250V
1N4004
29k
1%
.01F
1N4935
22F
47
0.1F
1M
1%
100F
400V
MR854
11k
1%
1.3
R9 620k
3x
1/4W
1N4148
AC+
AC-
1N4004
0.1F
450H
61T #22AWG
7T
R10
4.7M
D5
R4
R3
L1
R1
C1
D1
D3
D2
D4
R2
C4
C3
C2
D7
R7
R8
C6
V
BOOST
D6
R5
C5
R6
Q1
OUTPUT VOLTAGE REQUIREMENT
Since the converter is a boost type topology, it requires the output
voltage to always be higher than the input voltage.
It is
recommended to select this voltage at least 15% higher than the
maximum input voltage in order to: A) Avoid the inductor
saturation during line transience, and B) To keep the operating
frequency above the audible range at high line.
Figure 32 (next page) shows that when boost voltage is
selected near the maximum AC line, the increase in off-time could
reduce the operating frequency below the audible frequency and
cause inductor humming. In fact, Figure 32 (next page) shows
that for ±13% (100V to 130V) change in the line voltage the
optimum range of the operating frequency is when off-time duty
cycle (D') is between 0.57 and 0.75. This means that the boost
voltage needs to be 245V when selecting D' = 0.75 at maximum
AC line.
In this example, D' is chosen to be 0.8, to slightly reduce the
voltage rating of the back end DC to AC fluorescent lamp inverter.
This sets the boost voltage at:
V
O =
= 230V
130 * √2
0.8
Note: Thick trace on schematic shows high-frequency, high-current path in circuit.
Lead lengths must be minimized to avoid high-frequency noise problems.
FIGURE 31 — TYPICAL APPLICATION OF THE LX1562 IN AN 80W FLUORESCENT LAMP
BALLAST WITH ACTIVE POWER FACTOR CONTROL
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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