HVLED007 datasheet(15/33 Pages) STMICROELECTRONICS

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DS12866 Rev 1

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HVLED007

Application information

Table 7. Control quantities in a HVLED007-based Hi-PF QR flyback converter

Table 8. Electrical quantities in a HVLED007-based Hi-PF QR flyback converter

Eq. #

Parameter

Expression

Control voltage

ICS charge current

Current reference

Peak-to-peak current reference ripple at

switching frequency

Vc =

-------

V R

--------- Rs

Km Kp

-----------------

IMULT 

 = 4

------

V R

--------- Rs

-------- sin



Vcsref 

 = 4 Rs

V R

--------- sin



1 + Kv sin

-------------------------------

Vcs

ref



 = 1

Rt Ct

------------

4Pin

Kv VR

--------------- sin







2 Rs Lp

V R

--------------- 1 + Kv sin





Eq. #

Parameter

Expression

Peak envelope of primary current

Primary peak current

Primary rms current

Primary DC current

Primary AC current

Secondary peak current

Ip pk 

 = 4

V R

-------- sin



1 + Kv sin

-------------------------------

Ip pk = 4

V R

--------

1 + Kv

--------------------

Iprms = 4

V R

-------- 1

------ 1

---



------ Kv

Ipdc =

 K

-----------

V R

--------

Ipac = 4

V R

-------- 1

------ 1

---



-----

–



------ Kv

Is pk = 4

1 + Kv

------------------Iout

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