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STLDC08 Fiches technique(PDF) 18 Page - STMicroelectronics

No de pièce STLDC08
Description  Step-up controller for LED supply
PDF  29 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLDC08 Fiches technique(HTML) 18 Page - STMicroelectronics

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Application information
STLDC08
18/29
Doc ID 18476 Rev 1
Equation 6
Where DMAX is given by:
Equation 7
The value of the peak current on the inductor is given by the following equation:
Equation 8
The minimum required saturation current of the inductor must be greater than IL(PK) and can
be expressed as follows:
Equation 9
The saturation current rating for the inductor should be checked at the maximum duty cycle
and maximum output current.
8.4
Inductor peak current limit
The value of the inductor peak current limit can be programmed either by using a sense
resistor or by using the RDSON of the main Power MOSFET.
The following equation gives the relationship between the peak current limit and the value of
the sense resistor:
Equation 10
The sense resistor value can be determined fixing the value of the inductor peak current
limit equal to twice the value of the inductor peak current in steady-state conditions.
MAX
LED
)
AVG
(
L
L
D
1
I
%
40
I
%
40
I
−
×
=
×
=
Δ
D
OUT
)
MIN
(
IN
MAX
V
V
V
1
D
+
−
=
2
I
I
I
L
)
AVG
(
L
)
PK
(
L
Δ
+
=
2
I
D
1
I
I
I
L
MAX
OUT
)
PK
(
L
)
SAT
(
L
Δ
+
−
=
>
SENSE
SENSE
SENSE
)
MAX
(
IN
R
1
.
0
R
V
I
=
=



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