參數(shù)資料
型號: LTC1871IMS-1#TR
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10
封裝: PLASTIC, MSOP-10
文件頁數(shù): 22/36頁
文件大?。?/td> 523K
代理商: LTC1871IMS-1#TR
LTC1871-1
29
18711fb
APPLICATIONS INFORMATION
And so the inductor value is:
L
=
VIN(MIN)
2 IL f
DMAX =
5
2 1.5 300k
0.714
= 4μH
The component chosen is a BH Electronics BH510-
1007, which has a saturation current of 8A.
5. With an minimum input voltage of 5V, only logic-level
power MOSFETs should be considered. Because the
maximum duty cycle is 71.4%, the maximum SENSE
pin threshold voltage is reduced from its low duty
cycle typical value of 150mV to approximately 120mV.
Assuming a MOSFET junction temperature of 125°C,
the room temperature MOSFET RDS(ON) should be less
than:
RDS(ON)
VSENSE(MAX)
IO(MAX)
1
+
2
T
1
VO + VD
VIN(MIN)
+ 1
=
0.12
1.5
1
1.2 1.5
1
12.5
5
+ 1
= 12.7m
For a SEPIC converter, the switch BVDSS rating must be
greater than VIN(MAX) + VO, or 27V. This comes close to
an IRF7811W, which is rated to 30V, and has a maximum
room temperature RDS(ON) of 12mΩ at VGS = 4.5V.
Figure 18a. 4.5V to 15V Input, 12V/2A Output SEPIC Converter
Figure 18b. SEPIC Efciency vs Output Current
RUN
ITH
FB
FREQ
MODE/SYNC
SENSE
VIN
INTVCC
GATE
GND
1
2
3
4
5
10
9
8
7
6
LTC1871-1
RT
80.6k
1%
R1
12.1k
1%
R2
105k
1%
R3
1M
CVCC
4.7μF
X5R
CIN
47μF
M1
CIN, COUT1: KEMET T495X476K020AS
CDC, COUT2: TAIYO YUDEN TMK432BJ106MM
D1:
INTERNATIONAL RECTIFIER 30BQ040
D1
L1*
L2*
RC
33k
CC1
6.8nF
CC2
47pF
COUT1
47μF
20V
×2
VIN
4.5V to 15V
VOUT
12V
1.5A
(2A PEAK)
GND
18711 F018a
+
COUT2
10μF
25V
X5R
×2
L1, L2: BH ELECTRONICS BH510-1007 (*COUPLED INDUCTORS)
M1:
INTERNATIONAL RECTIFIER IRF7811W
CDC
10μF
25V
X5R
+
OUTPUT CURRENT (A)
50
EFFICIENCY
(%)
55
60
90
85
80
75
70
65
95
0.001
0.1
1
10
18711 F18b
45
0.01
100
VIN = 4.5V
VIN = 15V
VIN = 12V
VO = 12V
MODE = INTVCC
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LTC1871EMS-1#TR SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10
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