參數(shù)資料
型號(hào)： L4985
文件頁數(shù)： 12/23頁
文件大小： 415K
代理商： L4985
L4985
3
2,5,6,15,16
18
C8
20
14
7
13
4
R3
R4
L2
C5
V
OUT
= 3.3V/3A
C1
D94IN167
DIS1
1
R1
LED
L1
8
17
C3
C9
C10
9
MOS
10
C2
D1
19
R7
C12
R6
C11
Vin = 4.5 to 20V
C6
Figure28:
L4985 singleoutput: evaluationboard circuit.
Symbol
η
Parameter
Test Condition
Value
94.0
89.1
2.0
5.0
Unit
%
%
mV
mV
Efficiency
V
in
= 5V; I
out
= 1A ; V
out
= 3.3V
V
in
= 5V; I
out
= 3A ; V
out
= 3.3V
V
in
= 4.5 to 21V; I
out
= 0.5A
V
in
= 4.5 to 21V; I
out
= 0.5 to 3A
V
out
V
out
Line Regulation
Load Regulation
Table 2:
Step down converterusing synchronousrectifierevaluationresults.
C1 = 470
μ
F / 25V NCC LXF
C2 = 10
μ
F / 50V
C3 = 330nF film
C5 = C6 = 220
μ
F / 10V SANYO OS-CON
C8 = 560pF multilayer
C9 = C10 = 2.2
μ
F / 10V
C11 = 4.7nF (3.9nF **)
C12 = 8.2nF (5.6nF **)
R1 = 3.3k
R3 = 3.9k
(8.2k
**)
R4 = 2.4k
(27κ
**)
R6 = 56k
R7 = 33k
(39k
**)
L1 = 180
μ
H axial
L2 = 45
μ
H (CoreMagnetics 58120, 24 turns,
0.9mm PCB copper thickness 70mm)
[L2 = 50
μ
H (CoreMagnetics - 27 turns, 0.8mm )
PCB copper thickness 70mm **]
D1 = SB540 (pin 9 open)
(*) OPTIONAL: D1 = ST BYV 10 - 40
MOS = DY9410 SILICONIX
L4985
3
2,5,6,15,16
18
C8
20
14
7
13
4
R3
R4
L2
C5
V
OUT
= 5.1V/3A
C1
D94IN168
DIS1
1
R1
LED
L1
8
17
C3
C9
C10
9
MOS
10
C2
D1
19
R7
C12
R6
C11
Vin = 6V to 20V
Figure29:
L4985 single output: evaluationboard circuit (**).
L4985
12/23
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