參數(shù)資料
型號(hào)： LTC3862IUH#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24
封裝： 5 X 5 MM, 0.65 MM PITCH, LEAD FREE, PLASTIC, QFN-24
文件頁數(shù)： 26/40頁
文件大?。?/td> 613K
代理商： LTC3862IUH#TRPBF
LTC3862
32
3862fb
APPLICATIONS INFORMATION
Figure 25a. A 5V to 36V Input, 48V/5A Output 2-Phase Boost Converter Application Circuit
SENSE1+
3V8
SLOPE
BLANK
CLKOUT
SYNC
PLLFLTR
PHASEMODE
DMAX
10nF
SENSE1–
SENSE2–
SENSE2+
RUN
FREQ
SS
VIN
45.3k
24.9k
84.5k
10Ω
VIN
5V TO 36V
D1
30BQ060
D2
30BQ060
10Ω
L2
18.7μH
PB2020-223
ITH
SGND
VOUT
12.4k
FB
30.1k
475k
10nF
1μF
1nF
6.8μF 50V
0.008Ω
1W
Q1
HAT2266H
Q2
HAT2266H
0.008Ω
1W
VOUT
48V
5A (MAX)
3862 F25a
100μF
63V
100μF
63V
6.8μF 50V
10μF 50V
LTC3862
4.7nF
100pF
INTVCC
GATE1
GATE2
PGND
4.7μF
10nF
10μF 50V
L1
18.7μH
PB2020-223
+
Figure 25b. Output Current vs Input Voltage
INPUT VOLTAGE (V)
0
1
0
OUTPUT
LOAD
CURRENT
(A)
2
3
4
5
6
10
20
30
40
3862 F25b
4. A ripple current of 40% is chosen so the peak current
in each inductor is:
I
n
I
D
IN PK
OMAX
MAX
()
–
–
.
=
=+
1
21
1
2
1
0
χ
4
2
5
1 0 505
606
=
–.
.
A
5. The inductor ripple current is:
ΔI
n
I
D
A
L
OMAX
MAX
==
=
χ
–
.
–.
.
()
1
04
2
5
1 0 505
202
6. The inductor value is therefore:
L
V
If
D
V
AkHz
IN MIN
L
MAX
==
=
()
.
Δ
24
2 02
300
0 505
2
20μH
7. For a current limit value 30% higher than the maximum
load current:
IO(CL) = 1.3 IO(MAX) = 1.3 5A = 6.5A
The saturation current rating of the inductors must
therefore exceed:
I
n
I
D
L SAT
OMAX
MAX
()
.
–
≥+
=
1
2
13
1
2
χ
1
04
2
13 5
1 0 505
79
+
=
.
.
–.
.
A
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