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AN4350 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza AN4350
Descripción Electrónicos  High power factor LED driver with constant voltage regulation based on HVLED815PF
PDF  34 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4350 Datasheet(HTML) 13 Page - STMicroelectronics

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DocID025181 Rev 1
13/34
AN4350
Circuit description and design guidelines
34
where the previous transfer functions are:
Gpwm is the internal PWM modulator gain (Gpwm = 0.5)
Gps(s) is the power stage transfer function (transformer and output filter)
Gfp is the feedback gain between the VOUT and DMG pin
Gsh(s) is the internal sample and hold transfer function
Gea(s) is the error amplifier transfer function (COMP pin network)
Figure 5. Equivalent small signal voltage control loop schematic
The power stage transfer function is calculated considering the transfer function of
a standard flyback converter:
Equation 23
Equation 24
Equation 25
Gps s

Go ps
1
s
z1 ps
---------------------
+


1
s
z2 ps
---------------------
–


1
s
pps
-----------------
+


------------------------------------------------------------------------------
=
Go ps
1
2
---
NP
NS
-------
ROUT
RSENSE
---------------------
1dP
–
1dP
+
----------------
=
z1 ps
1
ESR COUT
---------------------------------
=



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