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參數(shù)資料
| 型號(hào)： | L6562D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER, PDSO8 |
| 封裝： | SO-8 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 249K |
| 代理商： | L6562D |
L6562
8/16
Figure 20. Gate-drive clamp vs. Tj
Figure 21. UVLO saturation vs. Tj
Tj (°C)
Vpin7 clamp
(V)
-50
0
50
100
150
10
11
12
13
14
15
Vcc = 20 V
Tj (°C)
-50
0
50
100
150
0.5
0.6
0.7
0.8
0.9
1
1.1
Vcc = 0 V
Vpin7
(V)
4
Application Information
4.1 Overvoltage protection
Under steady-state conditions, the voltage control loop keeps the output voltage Vo of a PFC pre-regulator
close to its nominal value, set by the resistors R1 and R2 of the output divider. Neglecting ripple compo-
nents, the current through R1, IR1, equals that through R2, IR2. Considering that the non-inverting input of
the error amplifier is internally referenced at 2.5V, also the voltage at pin INV will be 2.5V, then:
.
If the output voltage experiences an abrupt change
Vo > 0 due to a load drop, the voltage at pin INV will
be kept at 2.5V by the local feedback of the error amplifier, a network connected between pins INV and
COMP that introduces a long time constant to achieve high PF (this is why
Vo can be large). As a result,
the current through R2 will remain equal to 2.5/R2 but that through R1 will become:
.
The difference current
IR1=I'R1-IR2=I'R1-IR1=Vo/R1 will flow through the compensation network and en-
ter the error amplifier output (pin COMP). This current is monitored inside the L6562 and if it reaches about
37 A the output voltage of the multiplier is forced to decrease, thus smoothly reducing the energy deliv-
ered to the output. As the current exceeds 40 A, the OVP is triggered (Dynamic OVP): the gate-drive is
forced low to switch off the external power transistor and the IC put in an idle state. This condition is main-
tained until the current falls below approximately 10 A, which re-enables the internal starter and allows
switching to restart. The output
Vo that is able to trigger the Dynamic OVP function is then:
.
An important advantage of this technique is that the OV level can be set independently of the regulated
output voltage: the latter depends on the ratio of R1 to R2, the former on the individual value of R1. Another
advantage is the precision: the tolerance of the detection current is 12%, that is 12% tolerance on
Vo.
Since
Vo << Vo, the tolerance on the absolute value will be proportionally reduced.
Example: Vo = 400 V,
Vo = 40 V. Then: R1=40V/40A=1M; R2=1M2.5/(400-2.5)=6.289k. The tol-
erance on the OVP level due to the L6562 will be 400.12=4.8V, that is 1.2% of the regulated value.
I
R2
2.5
R2
--------
I
R1
Vo
2.5
–
R1
----------------------
==
=
I'
R1
Vo
2.5
–
Vo
+
R1
----------------------------------------
=
Vo
R 1 40 10
6
–
=
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