參數(shù)資料
型號(hào)： LTC3738
廠商： Linear Technology Corporation
英文描述： 16-Bit Buffer/Driver With 3-State Outputs 48-TSSOP -40 to 85
中文描述： 三相降壓控制器與Active定位電壓英特爾VRM9/VRM10
文件頁(yè)數(shù)： 29/32頁(yè)
文件大小： 316K
代理商： LTC3738
29
LTC3738
3738f
result that is within 10% to 20% of the final application.
The temperature of the MOSFET’s die temperature may
require interative calculations if one is not familiar typical
performance. A maximum operating junction tempera-
ture of 90
°
to 100
°
C for the MOSFETs is recommended
for high reliability applications.
Common output path DC loss:
P
NI
N
R
(
R
C
Loss
COMPATH
MAX
L
SENSE
OUTESR
≈
+
)
+
2
This totals 3.375W + C
OUTESR
loss.
Total of all three main MOSFET’s DC loss:
P
NV
V
I
N
R
)
C
Loss
MAIN
OUT
IN
MAX
DS ON
(
INESR
=
+
(
+
2
1
δ
)
This totals 1.3W + C
INESR
loss.
Total of all three synchronous MOSFET’s DC loss:
P
N
V
V
I
N
R
SYNC
OUT
IN
MAX
DS ON
(
=
+
(
)
1
1
2
–
)
δ
This totals 3.2W.
Total of all three main MOSFET’s AC loss:
P
V
A
pF
V
V
V
kHz
W
MAIN
IN
≈
+
=
3
45
2 3
2
140
)(
1
–1 8
5
1
1 8
.
400
6 3
.
2
(
)
( )( )(
)
(
)
This totals 0.14W at V
IN
= 8V, 0.315W at V
IN
= 12V and
0.875W at V
IN
= 20V.
Total of all three synchronous MOSFET’s AC loss:
( )
3
( )
f
(3 16
)
(
)
400
Q
V
V
nC
V
V
kHz
G
IN
DSSPEC
IN
DSSPEC
=
This totals 0.085W at V
IN
= 8V, 0.128W at V
IN
= 12V and
0.213W at V
IN
= 20V. The bottom MOSFET does not
experience the Miller capacitance dissipation issue that
the main switch does because the bottom switch turns on
when its drain is close to ground.
The Schottky rectifier loss assuming 50ns nonoverlap
time:
2 3(0.7V)(15A)(50ns)(400kHz)
This totals 1.26W.
The total output power is (1.3V)(45A) = 58.5W and the
total input power is approximately 67W so the % loss of
each component is as follows:
Main switch AC loss (V
IN
= 12V)
Main switch DC loss
Synchronous switch AC loss
Synchronous switch DC loss
Power path loss
The numbers above represent the values at V
IN
= 12V.
0.315W 0.47%
1.3W
0.128W 0.2%
3.2W
3.375W 5.05%
1.9%
4.8%
APPLICATIOU
W
U
U
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