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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： | 13/25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
Copyright 1996
Rev. 1.3a
8/30
20
P RODUCTION D ATA
S HEET
APPLICA TION INFORMA TION
ERROR AMPLIFIER COMPONENT SELECTION (continued)
Capacitor C5 is primarily selected to reject the output ripple
associated with twice the line frequency. For a 40dB ripple
rejection:
C5
≥
where f
l = 2x line frequency
C5
≥
= 0.062F,
Select C5 = 0.1F
Resistor R9 can be used to improve load transient response at the
cost of loosing 1 or 2% of load regulation. The value of this resistor
should be much greater than R8:
R9 = 620k
One way of achieving desired load transient response without
resorting to a complex mathematical model of the converter, is to
dynamically switch the output load and empirically find the
compensation network. The value of resistor R9 is selected using
the method shown in Figure 34.
FIGURE 34 — LOAD TRANSIENT RESPONSE CIRCUIT
I
DETECT COMPONENT SELECTION
Figure 35 shows voltage envelope generated by flyback voltage
across I
DET winding:
Select turns ratio n such that,
n =
= 0.11
I
DET winding turns are
selected to be 7T.
and R4 resistor:
< R4 < 500k
< R4 < 500k, or
8.4k < R4 < 500k
Select R4 = 22k
√2 V
AC (MIN)
I
ST (MAX)
√2 * 100
0.3 * 10
-3
√2 V
AC (MIN)
R3
- I
ST
V
ST
5V
V
BOOST - √2 VAC (MAX)
5V
230 -
√2 * 130
SUPPLY VOLTAGE
Resistor R3 must be selected such that it ensures converter start-
up at low line and is rated for high line power dissipation.
R3 <
where: I
ST
≡ Maximum start-up
current
V
ST
≡ Start-up voltage
T
ST(MAX) ≡ Maximum start-up
time at AC power-on
R3 <
= 466k
R3 > 4 V
AC (MAX)
(to keep power dissipation below 0.5W)
R3 > 68k ,
select R3 = 120k.
Start-up time of converter is given by:
T
ST (MAX) ≈
C2
for our application this will be 25ms/F.
I
OP * t
V
MIN
The start-up capacitor is selected such that capacitor discharge
time is always longer than the time it takes for the bootstrap
voltage to reach above the minimum start-up threshold of the IC.
C3 <
where: I
OP
≡ Maximum dynamic
supply current of the IC
t
≡ Rise time of the
bootstrap voltage
V
MIN ≡ Minimum hysteresis
voltage (4V for 1562,
1.7V for 1563)
C3 <
= 29F
Select C3 = 33F.
Start-up time is approximately 0.8 seconds.
The auxiliary winding turns are selected such that it provides 15V
of operating voltage.
N
S ≈ NP *
= 61 *
= 4T
However, in this example I
DETECT winding is used to power the IC
which eliminates the need for a third winding. This is possible
since the internal clamping of the output drive limits the gate
drive voltage to 14V (typ.) if the supply voltage exceeds this limit.
10 * 10
-3 * 10 * 10-3
4
V
S
V
O
V
S
V
O
100
2
π f
l R7
100
2
π * 120 * 2.2 * 106
V
BOOST
R
L
10Hz
50% D.C.
Min.
Load
n * V
BOOST
3 * 10
-3
0.11 * 230
3 * 10
-3
n
(V
BOOST - VAC)
n
V
AC
FIGURE 35 — FLYBACK VOLTAGE
ACROSS I
DET
WINDING
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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