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LED5000 датащи(PDF) 13 Page - STMicroelectronics

номер детали LED5000
подробное описание детали  3 A monolithic step-down current source with dimming capability
PDF  52 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED5000 датащи(HTML) 13 Page - STMicroelectronics

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LED5000
Application notes - buck conversion
Doc ID 023951 Rev 1
13/51
5
Application notes - buck conversion
5.1
Closing the loop
Figure 6.
Block diagram of the loop
5.2
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 RLOAD represents the load resistance (see Chapter 5.4), RCS 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 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
GCO(s)
AO(s)
αα
LED
AM13490v1
G
CO s
()
R
LOAD
R
CS
------------------
1
1
R
0
T
SW
⋅
L
--------------------------
m
C
1D
–
() 0.5
–
⋅
[]
⋅
+
-------------------------------------------------------------------------------------------------
1
s
ω
z
-----
+
⎝⎠
⎛⎞
1
s
ω
p
-----
+
⎝⎠
⎛⎞
---------------------
F
H s
()
⋅⋅
⋅
=



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