參數(shù)資料
型號(hào)： LT3437IFE
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： MOSFET N-CHANNEL 100V SOT323
中文描述： 0.9 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 4.40 MM, PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 12/24頁(yè)
文件大?。?/td> 523K
代理商： LT3437IFE
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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參數(shù)描述
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