參數(shù)資料
型號(hào)： L6561D013TR
廠(chǎng)商： 意法半導(dǎo)體
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： POWER FACTOR CORRECTOR
中文描述： 功率因數(shù)校正
文件頁(yè)數(shù)： 4/13頁(yè)
文件大?。?/td> 165K
代理商： L6561D013TR
L6561
4/13
3
The output voltage is expected to be kept by the operation of the PFC circuit close to its nominal value.
This is set by the ratio of the two external resistors R1 and R2 (see fig. 5), taking into consideration that
the non inverting input of the error amplifier is biased inside the L6561 at 2.5V.
In steady state conditions, the current through R1 and R2 is:
V
2.5
–
R1
OVER VOLTAGE PROTECTION OVP
and, if the external compensation network is made only with a capacitor C
comp
, the current through C
comp
equals zero.When the output voltage increases abruptly the current through R1 becomes:
V
V
+
R1
Since the current through R2 does not change,
I
R1
must flow through the capacitor C
comp
and enter the
error amplifier.
This current is monitored inside the L6561 and when reaches about 37
μ
A the output voltage of the multi-
plier is forced to decrease, thus reducing the energy drawn from the mains. If the current exceeds 40
μ
A,
the OVP protection is triggered (Dynamic OVP), and the external power transistor is switched off until the
current falls approximately below 10
μ
A.
However, if the overvoltage persists, an internal comparator (Static OVP) confirms the OVP condition
keeping the external power switch turned off (see fig. 4).Finally, the overvoltage that triggers the OVP
function is:
V
out
= R
1
· 40
μ
A.
Typical values for R
1
, R
2
and C are shown in the application circuits. The overvoltage can be set indepen-
V
ZCD
I
ZCD
I
ZCD
I
ZCD
V
DIS
I
ZCD
OUTPUT SECTION
V
GD
5
Lower Clamp Voltage
I
ZCD
= -3mA
1V
≤
V
ZCD
≤
4.5V
0.3
0.65
1
V
μ
A
mA
mA
5
Sink Bias Current
2
5
5
Source Current Capability
Sink Current Capability
-3
3
-10
10
5
Disable threshold
150
200
250
mV
μ
A
5
Restart Current After Disable
V
ZCD
< V
dis
; V
CC
> V
CCOFF
-100
-200
-300
7
Dropout Voltage
I
GDsource
= 200mA
I
GDsource
= 20mA
I
GDsink
= 200mA
I
GDsink
= 20mA
C
L
= 1nF
C
L
= 1nF
V
CC
=3.5V V
GD
= 1V
1.2
2
V
0.7
1
V
V
1.5
0.3
V
t
r
t
f
7
7
Output Voltage Rise Time
Output Voltage Fall Time
40
40
100
100
ns
ns
I
GD off
OUTPUT OVERVOLTAGE SECTION
I
OVP
2
OVP Triggering Current
Static OVP Threshold
RESTART TIMER
t
START
Start Timer
7
IGD Sink Current
5
10
-
mA
35
40
45
μ
A
V
2.1
2.25
2.4
70
150
400
μ
s
Table 5. Electrical Characteristics
(continued)
(V
CC
= 14.5V; T
amb
= -25°C to 125°C;unless otherwise specified)
Symbol
Pin
Parameter
Test Condition
Min.
Typ.
Max.
Unit
I
R1sc
-------------------------
I
R2
R2
------------
=
=
=
I
R1
---------------------------------------–
I
R1sc
I
R1
+
=
=
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