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LED7707 Folha de dados(PDF) 34 Page - STMicroelectronics

Nome de Peças LED7707
Descrição Electrónicos  6-rows 85 mA LEDs driver with boost regulator for LCD panels backlight
PDF  48 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED7707 Folha de dados(HTML) 34 Page - STMicroelectronics

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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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