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PM6600 Datasheet(PDF) 28 Page - STMicroelectronics

Part # PM6600
Description  6-row 32 mA LED driver with boost regulator for LCD panel backlight
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6600 Datasheet(HTML) 28 Page - STMicroelectronics

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PM6600
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Equation 7
Once the output capacitor has been chosen, the RCOMP can be calculated as:
Equation 8
Where GM = 2.7 S and gEA = 375 µS.
The CCOMP capacitor is determined to place the frequency of the compensation zero 5
times lower than the loop bandwidth:
Equation 9
Where fZ = fU / 5.
The close loop gain function (GLOOP) is thus given by equation 10:
Equation 10
A simple technique to optimize different applications is to replace RCOMP with a 20kΩ
trimmer and adjust its value to properly damp the output transient response. Insufficient
damping will result in excessive ringing at the output and poor phase margin. Figures 5a and
5b give an example of compensation adjustment for a typical application.
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
⋅
⋅
π
=
∆
MAX
_
IN
MIN
_
IN
U
OUT
OUT
V
V
1
C
f
2
I
V
M
g
G
C
f
2
R
EA
M
U
COMP
⋅
⋅
⋅
⋅
π
=
COMP
Z
COMP
R
f
2
1
C
⋅
⋅
π
=
sRC
1
R
M
L
s
1
RM
sC
1
R
g
G
G
2
COMP
COMP
EA
M
LOOP
+
−
⋅
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⋅
⋅
=
Figure 47.
Poor phase margin (a) and properly damped (b) load transient responses



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