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LED2001 датащи(PDF) 12 Page - STMicroelectronics

номер детали LED2001
подробное описание детали  4 A monolithic step-down current source with synchronous rectification
PDF  42 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED2001 датащи(HTML) 12 Page - STMicroelectronics

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Application notes
LED2001
12/42
DocID024346 Rev 1
6
Application notes
6.1
Closing the loop
Figure 5. Block diagram of the loop
6.2
GCO(s) control to output transfer function
The accurate control to output transfer function for a buck peak current mode converter can
be written as:
Equation 1
where R0 represents the load resistance, Ri the equivalent sensing resistor of the current
sense circuitry,
ωp the single pole introduced by the LC filter and ωz the zero given by the
ESR of the output capacitor.
FH(s) accounts for the sampling effect performed by the PWM comparator on the output of
the error amplifier that introduces a double pole at one half of the switching frequency.
VIN
-
+
-
LC filter
VREF
error
amplifier
FB
compensation
network
PWM
comparator
HS
switch
RS
L
COUT
RC
CC
+
PWM control
Current sense
LS
switch
VOUT
VCONTROL
G
CO(s)
A
O(s)
α
LED
G
CO s
()
R
0
R
i
-------
1
1
R
0
T
SW
⋅
L
-----------------------
m
C
1D
–
() 0.5
–
⋅
[]
⋅
+
----------------------------------------------------------------------------------------
1
s
ω
z
------
+


1
s
ω
p
------
+


---------------------- FH s
()
⋅⋅
⋅
=



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