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AN4350 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN4350
Description  High power factor LED driver with constant voltage regulation based on HVLED815PF
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4350 Datasheet(HTML) 9 Page - STMicroelectronics

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AN4350
Circuit description and design guidelines
34
Referring to the HVLED815PF datasheet, the average output voltage can be easily
programmed trough the RFB resistor, using Equation 9:
Equation 9
where NAUX and NSEC are the auxiliary and secondary turn numbers respectively and VREF
is the internal reference voltage (2.51 V typ.).
The RDMG resistor is designed to keep the line feed-forward and it can still be calculated as
shown in the HVLED815PF datasheet, considering the equivalent RSENSE_EQ resistor
defined in Equation 1:
Equation 10
where RFF and TD - the internal feed-forward resistor and the MOSFET turns OFF delay
time respectively. For more details see section 4.7: “Voltage feed-forward block” in the
HVLED815PF datasheet.
Using the calculated RDMG resistor, the RFB resistor can be calculated using Equation 9.
Equation 11
2.4
High power factor implementation
Referring to Figure 4, the RPF resistor (R6 on the application schematic) gives a contribution
proportional to the input voltage on the CS pin: as a consequence the input current is
proportional to the input voltage during the line period, implementing a high power factor
correction.
In particular, the contribution proportional to the input voltage is generated using the
auxiliary winding - diode in series to the RPF resistor is needed to avoid any injection on the
CS pin when the auxiliary winding is positive.
As mentioned in Section 2.3, through the ROS resistor (the R14 resistor on the schematic
between the CS pin and VCC pin) a positive offset on the CS pin is added, in order to keep
a good THD. This offset can be designed using Equation 12:
Equation 12
where VCSCV is the voltage on the CS pin that is imposed by the voltage control loop and
K is a constant that by experience is selected in the range of 2/3 - 3/4.
RFB
RDMG
VREF
NAUX
NSEC
-------------- VOUT

 V
REF
-------------------------------------------------------------
=
RDMG
NAUX
NP
--------------
LP RFF
TD RSENSE
EQ
----------------------------------------
19T
125T
--------------
 1.4mH 45
100ns 1.08
---------------------------------------
82k
==
=
RFB
82k
2.51V
19T
33T
---------- 25V

 2.51V
----------------------------------------------------
17.3k
==
VOS
VCC
RCS RSENSE
+
 
RPF

RCS RSENSE
+

RPF
 R
OS
+
-------------------------------------------------------------------------------------------
KVCS
CV
=
=


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