参数资料
型号: LM3423MHBKBSTEV/NOPB
厂商: National Semiconductor
文件页数: 32/67页
文件大小: 0K
描述: BOARD EVAL BUCK BOOST LM3423
标准包装: 1
系列: PowerWise®
电流 - 输出 / 通道: 1A
输出及类型: 1,非隔离
输出电压: 35V
特点: 可调光
输入电压: 4.5 ~ 35 V
已供物品:
已用 IC / 零件: LM3423
其它名称: LM3423MHBKBSTEV
SNVS574E – JULY 2008 – REVISED MAY 2013
Buck (Constant Ripple vs. V IN )
25 x ( V IN x V O - V O
)
f SW x C T x
V IN
R T =
R T =
25 x ( V IN - V O )
f SW x C T X V IN
2
2
(39)
(40)
Boost and Buck-boost
R T =
25
f SW x C T
(41)
3. AVERAGE LED CURRENT
For all topologies, set the average LED current (I LED ) knowing the desired current sense voltage (V SNS ) and
solving for R SNS :
R SNS =
V SNS
I LED
(42)
If the calculated R SNS is too far from a desired standard value, then V SNS will have to be adjusted to obtain a
standard value.
Setup the suggested signal current of 100 μA by assuming R CSH = 12.4 k ? and solving for R HSP :
R HSP =
I LED x R CSH x R SNS
1.24V
(43)
If the calculated R HSP is too far from a desired standard value, then R CSH can be adjusted to obtain a standard
value.
4. INDUCTOR RIPPLE CURRENT
Set the nominal inductor ripple current ( Δ i L-PP ) by solving for the appropriate inductor (L1):
Buck
( V - V O ) x D
x f SW
30
L 1 = ü IN
i L - PP
Boost and Buck-boost
V IN x D
L1=
ü i L - PP x f SW
To set the worst case inductor ripple current, use V IN-MAX and D MIN when solving for L1.
The minimum allowable inductor RMS current rating (I L-RMS ) can be calculated as:
Buck
(44)
(45)
§ ' I L-PP ·
? 1
I L-RMS = I LED x
1+
1
12
I LED
x ¨ ?
2
(46)
32
Copyright ? 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1
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