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| 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： | 11/25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
19
Copyright 1996
Rev. 1.3a
8/30
P RODUCTION
D ATA
S HEET
APPLICATION INFORMA TION
INDUCTOR DESIGN (continued)
Step 2: Choose a core with higher K
g than the one calculated in
Step 1.
K
g/core = k
where:
k
≡ Winding coefficient (typ. k=0.4)
A
W
≡ Bobbin window area
A
E
≡ Effective core area
l
W
≡ Mean length per turn
K
g factor for TDK PQ2625:
A
W
= 47.7mm2
A
E
= 118mm2
l
W
= 56.2mm
K
g = 0.4
(mm)5 = 4.7 * 10
-12 m5
A
W AE
2
l
W
(47.7) (118)2
56.2
Step 3: Determine number of turns.
N =
= 61 turns
A
WIRE = k
= 0.4
= 0.31mm2
= 480mil2
choose #22 AWG with r = 0.0165
/feet resistance.
R
W = N * lw * r
R
W = 0.185
L I
LP
B A
E
450 * 10
-6 * 2.4
0.15 * 118 * 10
-6
A
W
N
47.7
61
Step 4: Calculate air gap.
l
g
=
l
q =
= 0.122cm = 48 mil
O N
2 A
E
L
4
π * 10-7 * (61)2 * 118 * 10-6
450 * 10
-6
CURRENT SENSE RESISTOR
Current sense resistor, R6 is selected using the minimum multi-
plier output clamp voltage and the maximum inductor peak
current such that:
R6 =
=
= 0.45
Power dissipation is approximated by:
P
R ≈
I
2 (MAX)
2 (1 - D'
MIN),
where D'
MIN= 1 -
P
R ≈
(2.4)2 (1 - 0.61) = 0.374
Select THREE 1.3
, W carbon comp resistors in parallel.
V
CLAMP(MIN)
I
L (MAX)
1.1
2.4
1
6
√2 V
AC(MIN)
V
BOOST
1
6
R2
R1 + R2
MULTIPLIER COMPONENT SELECTION
Calculate R1 & R2 resistor values such that under low line AC input
the multiplier output is lower than the minimum clamp voltage.
* √2 VAC (MIN) * K * (VEA0 (MAX) - VREF) < VCLAMP (MIN)
where: K
≡ Mult. Gain
V
EA)(MAX) ≡ Maximum error amp output where
multiplier is still in linear range.
This voltage is
≈ 3.5V.
For K = 0.65 & V
CLAMP (MIN) = 1.1V, the ratio of R1/R2 is:
> 83
Assuming R1 is selected to be:
* R1 = 2.2M (1%)
R2 =
= 26.4k (1%)
select R
2 = 26.7k
(1%)
* For high input applications such as 277V, R1 must be divided
into two resistors in series to meet the maximum rated voltage of
the resistors.
To improve THD further (typ. 2-3%), a high value resistor can
be connected from the supply voltage to this pin to allow an
increase in the switch on-time at the zero crossing by adding an
effective offset at the multiplier output.
ERROR AMPLIFIER COMPONENT SELECTION
Boost voltage is programmed with R7 & R8 resistor dividers using
the following equation:
=
-1,
assuming that the product of R7 and the E.A. input bias current
does not cause significant error in the output voltage setting.
Assuming R7 = 1M
(for output voltage of higher than 250V,
two resistors may be added in series to meet the voltage
requirement of the resistor.)
V
ERROR (10
6) (0.5 * 10-6) = 0.5V,
which is < 0.25% of the
output voltage.
Calculating R8:
R8 =
= 11k (1%)
Worst case output tolerance is the total of ±3.75% which is the sum
of ±1.5% (Ref), ±2% (resistor dividers), and ±0.25% (E.A. input
bias current).
R7
R8
V
BOOST
V
REF
R7
V
BOOST
V
REF
- 1
R1
R2
2.2M
83
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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