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LED7707 数据表(PDF) 33 Page - STMicroelectronics

部件名 LED7707
功能描述  6-rows 85 mA LEDs driver with boost regulator for LCD panels backlight
PDF  48 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

LED7707 数据表(HTML) 33 Page - STMicroelectronics

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LED7707
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Equation 25
where D is the duty-cycle defined as:
Equation 26
whereas R0 is:
Equation 27
and
Equation 28
The output voltage in the above calculations is considered as the maximum value (LED with
the maximum forward voltage connected to the leading generator):
Equation 29
Considering the input voltage range, the lower LB will be at the lower input voltage. Hence
the condition to assure the DCM operation becomes:
Equation 30
An inductor value of 4.7 µH could be a suitable value, considering also a margin from the
boundary condition.
It is important to highlight that the inductor choice involves not only the value itself but the
saturation current (higher than the current limit, see Section 6.4.4), the rated RMS current
(the compliance with the saturation current might be not enough; also the thermal
performances must be taken into account), the DCR (which affects the efficiency) and the
size (in some application might be a strict requirement).
However the DCR can’t be reduced keeping the size small. Hence a trade off between these
two requirements must be achieved according to the application.
(
)
SW
2
0
B
F
2
D
1
D
R
L
⋅
−
⋅
⋅
=
⎩
⎨
⎧
=
=
=
−
=
V
2
.
13
V
@
50
.
0
V
8
.
10
V
@
59
.
0
V
V
1
D
max
,
IN
min
,
IN
OUT
IN
Ω
=
=
74
I
V
R
OUT
OUT
0
mA
360
I
6
I
ROW
OUT
=
⋅
=
V
6
.
26
mV
700
V
7
V
max
,
LEDs
,
F
max
,
OUT
=
+
⋅
=
(
)
H
6
.
5
V
L
L
min
,
IN
B
μ
=
<



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