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參數(shù)資料
| 型號(hào)： | LT3437 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Panels; For Use With:EUROCARD Subracks RoHS Compliant: Yes |
| 中文描述： | 高電壓，200kHz降壓500mA的降壓開關(guān)穩(wěn)壓器以100？的靜態(tài)電流 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 523K |
| 代理商： | LT3437 |
LT3437
12
3437f
APPLICATIOU
W
U
U
Discontinuous operation occurs when:
I
V
V
V
L f V
2
OUT DIS
(
OUT
IN
OUT
)
IN
)
–
≤
(
)
For V
OUT
= 5V, V
IN
= 8V and L = 68
μ
H:
I
e
e
A
OUT MAX
(
)
0. –
–
–
. – .
0 5 0 069
.
=
( )(
)
(
)(
)( )
=
=
2 68
6 200 3 8
0 431
Note that there is less load current available at the higher
input voltage because inductor ripple current increases. At
V
IN
= 15V, duty cycle is 33% and for the same set of
conditions:
( )(
(
=
0 5 0 121 0 379
I
e
e
A
OUT MAX
(
)
0. –
–
–
. – .
.
=
)
)(
)( )
2 68
6 200 3 15
To calculate actual peak switch current in continuous
mode with a given set of conditions, use:
(
( )( )( )
I
I
V
V
V
L f V
SW PK
(
OUT
OUT
2
IN
OUT
IN
)
–
=
+
)
If a small inductor is chosen which results in discontinuous
mode operation over the entire load range, the maximum
load current is equal to:
I
I
f L V
( )( )( )
)(
V
V
V
OUT MAX
(
PK
OUT
IN
OUT
)
–
=
(
)
2
2
2
CHOOSING THE INDUCTOR
For most applications the output inductor will fall in the
range of 68
μ
H to 220
μ
H. Lower values are chosen to
reduce physical size of the inductor. Higher values allow
MAXIMUM OUTPUT LOAD CURRENT
Maximum load current for a buck converter is limited by
the maximum switch current rating (I
PK
). The current
rating for the LT3437 is 500mA. Unlike most current mode
converters, the LT3437 maximum switch current limit
does not fall off at high duty cycles. Most current mode
converters suffer a drop off of peak switch current for duty
cycles above 50%. This is due to the effects of slope
compensation required to prevent subharmonic oscilla-
tions in current mode converters. (For detailed analysis,
see Application Note 19.)
The LT3437 is able to maintain peak switch current limit
over the full duty cycle range by using patented circuitry to
cancel the effects of slope compensation on peak switch
current without affecting the frequency compensation it
provides.
Maximum load current would be equal to maximum
switch current for an infinitely large inductor, but with
finite inductor size, maximum load current is reduced by
one-half peak-to-peak inductor current. The following
formula assumes continuous mode operation, implying
that the term on the right (I
P-P
/2) is less than I
OUT
.
(
( )( )( )
I
I
V
V
V
L f V
I
I
OUT MAX
(
PK
OUT
2
IN
OUT
IN
PK
P
)
–
–
–
=
)(
)
=
-P
2
Figure 3. LT3437 Ripple Voltage Waveform
V
10mV/DIV
100
μ
F TANTALUM
ESR 75m
V
10mV/DIV
100
μ
F CERAMIC
V
10V/DIV
V
IN
= 12V
V
OUT
= 3.3V
I
= 500mA
L = 100
μ
H
1
μ
s/DIV
3437 F03
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|---|---|
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3437_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100μA Quiescent Current |
| LT3437EDD | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.3V to 60V 10-Pin DFN EP |
| LT3437EDD#PBF | 功能描述:IC REG BUCK ADJ 0.5A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3437EDD#TRPBF | 功能描述:IC REG BUCK ADJ 0.5A 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT3437EFE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.3V to 60V 16-Pin TSSOP EP |
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