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BD9486F Datasheet(PDF) 20 Page - Rohm

Part # BD9486F
Description  1ch Boost up type White LED Driver for large LCD
PDF  38 Pages
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD9486F Datasheet(HTML) 20 Page - Rohm

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Datasheet
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TSZ02201-0F1F0C100240-1-2
© 2013 ROHM Co., Ltd. All rights reserved.
15.Feb.2016 Rev.006
www.rohm.com
TSZ22111・15・001
BD9486F
[setting example]
Output voltage = VOUT [V] = 40V
LED total current = IOUT [A] = 0.48V
DCDC input voltage of the power stage = VIN [V] = 24V
Efficiency of DCDC =η[%] = 90%
Averaged input current IIN is calculated as follows.
If the switching frequency, fSW = 200kHz, and the inductor, L=100μH, the ripple current of the inductor L (ΔIL[A]) can be
calculated as follows.
Therefore the inductor peak current, Ipeak is
If Rcs is assumed to be 0.3Ω
…Rcs value confirmation
The above condition is met.
And Ipeak_det, the current OCP works, is
If the current rating of the used parts is 2A,
This inequality meets the above relationship. The parts selection is proper.
And IMIN, the bottom of the IL ripple current, can be calculated as follows.
This inequality implies that the operation is continuous current mode.
]
A
[
.
[%]
]
V
[
]
A
[
.
]
V
[
[%]
]
V
[
V
]
A
[
I
]
V
[
V
]
A
[
I
IN
OUT
OUT
IN
89
0
90
24
48
0
40
　
]
A
[
.
]
Hz
[
]
V
[
]
H
[
]
V
[
])
V
[
]
V
[
(
]
Hz
[
f
]
V
[
V
]
H
[
L
]
V
[
V
])
V
[
V
]
V
[
V
(
IL
SW
OUT
IN
IN
OUT
48
0
10
200
40
10
100
24
24
40
3
6
　
Δ
]
A
[
.
]
A
[
.
]
A
[
.
]
A
[
]
A
[
IL
]
A
[
I
Ipeak
IN
13
1
2
48
0
89
0
2
　
0
65
0
48
0
13
1
2

]
A
[
.
]
A
[
.
]
A
[
.
]
A
[
]
A
[
IL
]
A
[
I
I
IN
MIN


det
_
peak
peak
I
I
…calculation result of the peak current
V
.
]
V
[
.
]
A
[
.
]
[
.
Ipeak
Rcs
VCS
peak
4
0
339
0
13
1
3
0

]
A
[
.
]
[
.
]
V
[
.
I
det
_
peak
33
1
3
0
4
0
]
A
[
.
]
A
[
.
]
A
[
.
0
2
33
1
13
1


The current rating
…current rating confirmation
of DCDC parts



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