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LED7707 Datasheet(PDF) 34 Page - STMicroelectronics

Part # LED7707
Description  6-rows 85 mA LEDs driver with boost regulator for LCD panels backlight
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED7707 Datasheet(HTML) 34 Page - STMicroelectronics

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Application information
LED7707
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6.4.4
Output capacitor choice
The choice of the output capacitor is mainly affected by the desired output voltage ripple.
Since the voltage across the LEDs can be considered almost constant, this ripple is
transferred across the current generators, affecting their dynamic response.
The output ripple can be estimated as (neglecting the contribution of ESR of COUT, very low
in case of MLCC):
Equation 31
where IL, peak is the inductor peak current (see Figure 21) calculated as:
Equation 32
whereas D, working in DCM, is:
Equation 33
defining M as:
Equation 34
Figure 21.
Inductor current in DCM operation
(
)
`
C
2
T
I
I
V
OUT
OFF
OUT
peak
,
L
OUT
⋅
⋅
−
=
Δ
⎩
⎨
⎧
=
=
=
⋅
⋅
=
V
2
.
13
V
@
A
762
.
1
V
8
.
10
V
@
A
915
.
1
L
F
D
V
I
max
,
IN
min
,
IN
sw
IN
peak
,
L
⎩
⎨
⎧
=
=
=
−
⋅
⋅
⋅
=
V
2
.
13
V
@
414
.
0
V
8
.
10
V
@
55
.
0
R
)
1
M
(
M
L
F
2
D
max
,
IN
min
,
IN
0
sw
⎩
⎨
⎧
=
=
=
V
2
.
13
V
@
015
.
2
V
8
.
10
V
@
463
.
2
V
V
M
max
,
IN
min
,
IN
IN
OUT
IL, peak
IL
t
TSW = 1/FSW
TON
TOFF
AM00593v1



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