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L6599 Datasheet(PDF) 28 Page - STMicroelectronics

Part # L6599
Description  High-voltage resonant controller
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6599 Datasheet(HTML) 28 Page - STMicroelectronics

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Application information
L6599
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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
(VinON) and OFF (VinOFF) thresholds of the input voltage:
which, solved for RH and RL, yield:
While the line undervoltage is active there is no PWM activity, thus the VCC 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
ON
1.25
–
R
H
----------------------------------
15
10
6
–
1.25
R
H
-----------
+
⋅
=
Vin
OFF
1.25
–
R
H
-------------------------------------
1.25
R
H
-----------
=
R
H
Vin
ON
Vin
OFF
–
15
10
6
–
⋅
------------------------------------------
=
R
L
R
H
1.25
Vin
OFF
1.25
–
-------------------------------------
⋅
=



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