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參數(shù)資料
| 型號： | L6563_07 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Advanced transition-mode PFC controller |
| 中文描述： | 先進(jìn)的過渡模式PFC控制器 |
| 文件頁數(shù)： | 27/39頁 |
| 文件大小： | 565K |
| 代理商： | L6563_07 |
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L6563 - L6563A
Application information
27/39
6.6
Inductor saturation detection (L6563 only)
Boost inductor's hard saturation may be a fatal event for a PFC pre-regulator: the current
upslope becomes so large (50-100 times steeper, see
Figure 42
) that during the current
sense propagation delay the current may reach abnormally high values. The voltage drop
caused by this abnormal current on the sense resistor reduces the gate-to-source voltage,
so that the MOSFET may work in the active region and dissipate a huge amount of power,
which leads to a catastrophic failure after few switching cycles.
However, in some applications such as ac-dc adapters, where the PFC pre-regulator is
turned off at light load for energy saving reasons, even a well-designed boost inductor may
occasionally slightly saturate when the PFC stage is restarted because of a larger load
demand. This happens when the restart occurs at an unfavorable line voltage phase, so that
the output voltage may drop significantly below the rectified peak voltage. As a result, in the
Figure 40. 80W, wide-range-mains PFC pre-regulator with tracking boost function active
14
3
BRIDGE
4 x 1N4007
C1
0.22 μF
400V
C3
22
m
F
25V
FUSE
4A/250V
R3
68 k
T
11
12
L6563
13
2
1
C6 100 nF
R6
10
MOS
STP8NM50
4
C6
56 μF
400V
Vo=200 to 385 V
Po=80W
Vac
(88V to 264V)
R7a,b
0.68
1/4 W
R9
47.5 k
+
-
C2
2.2nF
D1
STTH1L06
NTC
R5
62 k
C5
1 μF
5
C4
470 nF
6
7
10
8
9
R4
21 k
R8b
1 M
Supply Voltage
10.3 to 22V
R8a
1 M
C7
10 nF
R10b
3.3 M
R10a
3.3 M
R11
34.8 k
R1b
3.3 M
R1a
3.3 M
R2
51.1 k
R10
390 k
Figure 41. Tracking boost and voltage feedforward blocks
R1
L6563
L6563A
INV
1
Vout
TBO
6
1:1 CURRENT
MIRROR
R
T
2.5V
E/A
+
-
COMP
2
3V
-
+
5
I
TBO
I
R1
MULT
3
R5
Rectified mains
R6
"ideal"
diode
MULTIPLIER
1/V
2
current
reference
R2
I
R2
I
TBO
9.5V
9.5V
VFF
C
FF
R
FF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6563A | ADVANCED TRANSITION-MODE PFC CONTROLLER |
| L6563ATR | ADVANCED TRANSITION-MODE PFC CONTROLLER |
| L6563 | ADVANCED TRANSITION-MODE PFC CONTROLLER |
| L6563TR | ADVANCED TRANSITION-MODE PFC CONTROLLER |
| L6566A | Multi-mode controller for SMPS with PFC front-end |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6563A | 功能描述:功率因數(shù)校正 IC Advanced transition mode PFC controller RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6563ATR | 功能描述:功率因數(shù)校正 IC Advanced transition mode PFC controller RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6563CYTR | 制造商:ST 功能描述:ADVANCED TRANSITION-MODE PFC CONTROLLER |
| L6563H | 功能描述:功率因數(shù)校正 IC High voltage start Transition-mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6563HTR | 功能描述:功率因數(shù)校正 IC 700V 6mA Start-Up Transition-Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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