參數(shù)資料
型號： LTC1628C
廠商： Linear Technology Corporation
元件分類： 基準電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開關(guān)穩(wěn)壓器
文件頁數(shù)： 25/32頁
文件大小： 375K
代理商： LTC1628C
25
LTC1628-SYNC
Design Example
As a design example for one channel, assume V
IN
=
12V(nominal), V
IN
= 22V(max), V
OUT
= 1.8V, I
MAX
= 5A,
and f = 300kHz.
The inductance value is chosen first based on a 30% ripple
current assumption. The highest value of ripple current
occurs at the maximum input voltage. Tie the PLLFLTR pin
to the INTV
CC
pin for 300kHz operation. The minimum
inductance for 30% ripple current is:
I
V
( )( )
f L
V
V
L
OUT
OUT
IN
=
–
1
A 4.7
μ
H inductor will produce 23% ripple current and a
3.3
μ
H will result in 33%. The peak inductor current will be
the maximum DC value plus one half the ripple current, or
5.84A, for the 3.3
μ
H value. Increasing the ripple current
will also help ensure that the minimum on-time of 200ns
is not violated. The minimum on-time occurs at maximum
V
IN
:
t
V
V
f
V
V
kHz
ns
ON MIN
(
OUT
IN MAX
(
)
)
.
(
)
=
=
=
1 8
22 300
273
The R
SENSE
resistor value can be calculated by using the
maximum current sense voltage specification with some
accommodation for tolerances:
R
mV
A
SENSE
≤
≈
60
5 84
.
0 01
.
Since the output voltage is below 2.4V the output resistive
divider will need to be sized to not only set the output
voltage but also to absorb the SENSE pins specified input
current.
R
k
V
V
V
–1 8
V
0 8
.
K
V
V
k
MAX
(
OUT
1
24
0 8
.
–
2 4
.
24
2 4
.
32
)
=
=
=
Choosing 1% resistors; R1 = 25.5k and R2 = 32.4k yields
an output voltage of 1.816V.
The power dissipation on the top side MOSFET can be
easily estimated. Choosing a Siliconix Si4412DY results
in; R
DS(ON)
= 0.042
, C
RSS
= 100pF. At maximum input
voltage with T(estimated) = 50
°
C:
P
V
V
C
C
)(
V
A
pF
kHz
mW
MAIN
=
( )
+
°
°
[
]
(
)
+
(
) ( )(
)
=
1 8
22
5
1
(0 005 50
25
0 042
.
1 7 22
.
5
100
300
220
2
2
.
)(
–
)
A short-circuit to ground will result in a folded back current
of:
I
mV
+
0 01
.
ns
3 3
.
V
H
A
SC
=
μ
=
25
1
2
200
22
(
3 2
.
)
with a typical value of R
DS(ON)
and
δ
= (0.005/
°
C)(20) =
0.1. The resulting power dissipated in the bottom MOSFET
is:
(
=
434
P
V
V
V
A
mW
SYNC
=
) ( )
(
)
22
22
3 2
.
1 1 0 042
.
2
–1 8
.
which is less than under full-load conditions.
C
IN
is chosen for an RMS current rating of at least 3A at
temperature assuming only this channel is on. C
OUT
is
chosen with an ESR of 0.02
for low output ripple. The
output ripple in continuous mode will be highest at the
maximum input voltage. The output voltage ripple due to
ESR is approximately:
V
ORIPPLE
= R
ESR
(
I
L
) = 0.02
(1.67A) = 33mV
P–P
APPLICATIOU
W
U
U
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