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DFS04M Scheda tecnica(PDF) 8 Page - STMicroelectronics

Il numero della parte DFS04M
Spiegazioni elettronici  APPLICATION NOTE
PDF  42 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

DFS04M Scheda tecnica(HTML) 8 Page - STMicroelectronics

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AN1262 APPLICATION NOTE
8/42
All of the above mentioned calculation steps are summarized in table 6.
Table 6. Preliminary Calculations (step 2)
8
OPERATING CONDITIONS @ VIN = VDCMIN
From the thermal point of view the heaviest operating conditions for the IC, and for most of the other parts of
the converter as well, are usually encountered at minimum input voltage.
That is why the operating conditions @ Vin = VDCmin need being evaluated. This will be done with the aid of the
relationships in table 7.
Table 7. Relationship useful for calculating converter's operating conditions @ Vin = VDCmin
Symbol
Parameter
Definition
PinT
Transformer Input Power
VDS(on)x
Max. average drop on RDS(on) in ON-state
Dx
Maximum Duty Cycle
VDSmax
Maximum drain Voltage in OFF-state
VDSmax = VPKmax + VR + Vspike
Ippkx
Max. Peak Primary Current
Symbol
Description
Definition
D
Duty Cycle (switch ON-time to switching period ratio)
Ippk
Peak Primary Current
Ippk = Ippkx
IpDC
DC Primary Current
IpRMS
Total RMS Primary Current
IpAC
RMS Primary Current (AC component only)
D‘
Secondary diode conduction time to switching period ratio
Ispk
Peak Secondary Current
IsDC
DC Secondary Current
IsDC = Iout
P
inT
V
out
V
F
+
() I
ou t
⋅
η
T
-------------------------------------------
=
V
DS on
()
V
inmin
V
R
+
1
V
inmin
V
R
⋅
P
in
R
DS on
()
⋅
----------------------------------
+
--------------------------------------------
≈
D
X
V
R
V
inm i n
V
DS on
()x
–
() V
R
+
-----------------------------------------------------------------
=
Ip
pkx
P
inT
V
inm i n
V
DS on
()x
–
----------------------------------------------
2
D
X
-------
⋅
=
D
V
inm i n
V
DS on
()x
–
V
DCmin
V
DS on
()x
–
-------------------------------------------------
=
D
X
⋅
Ip
DC
DIp
pk
⋅
2
-------------------
=
Ip
RM S
Ip
pk
D
3
----
⋅
=
Ip
AC
Ip
RMS
2
Ip
DC
2
–
=
D'
V
DCmin
V
DS on
()x
–
V
R
------------------------------------------------- D
⋅
=
Is
pk
2I
out
⋅
D'
-----------------
=



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