參數(shù)資料
型號(hào)： LTC3780EG
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： DIODE SCHOTTKY SINGLE 25V 200mW 0.4V-vf 200mA-IFM 10mA-IF 0.5uA-IR SOD-123 3K/REEL
中文描述： 3 A SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO24
封裝： 5.30 MM, PLASTIC, SSOP-24
文件頁(yè)數(shù)： 23/28頁(yè)
文件大?。?/td> 421K
代理商： LTC3780EG
23
LTC3780
3780f
Tie the PLLFLTR pin to INTV
CC
for 400kHz operation. The
inductance value is chosen first based on a 30% ripple
current assumption. In Buck mode, the ripple current is:
=
I
V
f L
V
V
LBUCK
,
OUT
OUT
IN
–
1
The highest value of ripple current occurs at the maximum
input voltage. In Boost mode, the ripple current is:
=
I
V
f L
V
V
LBOOST
,
IN
IN
OUT
–
1
The highest value of ripple current occurs at V
IN
= V
OUT
/2.
A 6.8
μ
H inductor will produce 13% ripple in Boost mode
(V
IN
= 6V) and 29% ripple in Buck mode (V
IN
= 18V).
The R
SENSE
resistor value can be calculated by using the
maximum current sense voltage specification with some
accommodation for tolerances.
R
mV V
+
)
I
I
V
SENSE
IN
OUT MAXBOOST
(
LBOOST
,
OUT
=
(
)
2 160
2
,
Select an R
SENSE
of 10m
.
Output voltage is 12V. Select R1 as 20k. R2 is:
R
V
R
R
OUT
0 8
2
1
1
=
.
–
Select R2 as 280k. Both R1 and R2 should have a tolerance
of no more than 1%.
Next, choose the MOSFET switches. A suitable choice is
the Siliconix Si4840 (R
DS(ON)
= 0.009
(at V
GS
= 6V), C
RSS
= 150pF,
θ
JA
= 40
°
C/W).
The maximum power dissipation of Switch A occurs
in Boost mode when Switch A stays on all the time.
Assuming a junction temperature of T
J
= 150
°
C with
ρ
150
°
C
= 1.5, the power dissipation at V
IN
= 5V is:
P
W
ABOOST
,
1 5 0 009
.
=
=
12
5
5
1 94
2
APPLICATIU
W
U
U
Double-check the T
J
in the MOSFET with 70
°
C ambient
temperature:
T
J
= 70
°
C + 1.94W 40
°
C/W = 147.6
°
C
The maximum power dissipation of Switch B occurs in
Buck mode. Assuming a junction temperature of T
J
= 80
°
C
with
ρ
80
°
C
= 1.2, the power dissipation at V
IN
= 18V is:
P
mW
BBUCK
,
–
1 2 0 009
=
=
18 12
12
5
135
2
Double-check the T
J
in the MOSFET at 70
°
C ambient
temperature:
T
J
= 70
°
C + 0.135W 40
°
C/W = 75.4
°
C
The maximum power dissipation of Switch C occurs in
Boost mode. Assuming a junction temperature of T
J
= 110
°
C
with
ρ
110
°
C
= 1.4, the power dissipation at V
IN
= 5V is:
P
p
k
W
CBOOST
,
–
1 4 0 009
.
=
(
)
+
=
12 5
12
5
5
2 12
5
5
150
400
1 08
2
2
3
Double-check the T
J
in the MOSFET at 70
°
C ambient
temperature:
T
J
= 70
°
C + 1.08W 40
°
C/W = 113
°
C
The maximum power dissipation of Switch D occurs in
Boost mode when its duty cycle is higher than 50%.
Assuming a junction temperature of T
J
= 100
°
C with
ρ
100
°
C
= 1.35, the power dissipation at V
IN
= 5V is:
P
W
DBUCK
,
1 35 0 009
.
.
=
=
5
12
12
5
5
0 73
2
Double-check the T
J
in the MOSFET at 70
°
C ambient
temperature:
T
J
= 70
°
C + 0.73W 40
°
C/W = 99
°
C
C
IN
is chosen to filter the square current in Buck mode. In
this mode, the maximum input current peak is:
I
IN,PEAK(MAX,BUCK)
= 5 (1 + 29%) = 6.5A
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參數(shù)描述
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