參數(shù)資料
型號: L6599
廠商: 意法半導體
英文描述: High-voltage resonant controller
中文描述: 高壓諧振控制器
文件頁數(shù): 28/36頁
文件大?。?/td> 591K
代理商: L6599
Application information
L6599
28/36
Figure 32. Line sensing function: internal block diagram and timing diagram
With reference to
Figure 32
the following relationships can be established for the ON
(Vin
ON
) and OFF (Vin
OFF
) thresholds of the input voltage:
which, solved for R
H
and R
L
, yield:
While the line undervoltage is active there is no PWM activity, thus the V
CC
voltage (if not
supplied by another source) continuously oscillates between the start-up and the UVLO
thresholds, as shown in the timing diagram of
Figure 32.
As an additional measure of safety (e.g. in case the low-side resistor is open or missing, or
in non-power factor corrected systems in case of abnormally high input voltage) if the
Vin
----------------------------------
1.25
R
H
15
10
6
R
H
-----------
+
=
Vin
------------------------------------
1.25
R
H
R
H
-----------
=
R
H
Vin
15
Vin
10
------------------------------------------
=
R
L
R
H
Vin
OFF
1.25
------------------------------------
=
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