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SC4541 датащи(PDF) 12 Page - Semtech Corporation

номер детали SC4541
подробное описание детали  High Frequency LED Driver with Integrated Schottky and Simple Interconnect
PDF  19 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4541 датащи(HTML) 12 Page - Semtech Corporation

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SC4541
12
L1: MURATA LQH3NPN100NM0 (10μH/ 550mA/ 3x3x1.4(mm)
C2: MURATA GRM188R7YA105K(1μF/ X7R/ 35V/ 0603)
U1
SC4541
IN
GND
SW
OUT
FB
EN
EDP
C3: MURATA GRM188R71C105K(1μF/ X7R/ 16V/ 0603)
LED1 to 6: Everlight 12-21C/T3D-CP1Q2B12Y/2C
L1
10μH
R1
10Ω
R5
VIN (5V)
C3
1μF
16V
VOUT
10KΩ
LED5
1μF
35V
LED1
LED2
LED3
LED4
PWM(300Hz, 3.3V)
C2
LED6
PCB Layout Considerations
Poor layout can degrade the performance of the DC-DC
converter and can be a contributory factor in EMI prob-
lems, ground bounce, thermal issues, and resistive
voltage losses. Poor regulation and instability can result.
A typical application schematic is shown in Figure 1. A
typical PCB layout is shown in Figure 4.
Applications Information ( continued)
The following design rules are recommended:
•
Place the inductor and filter capacitors as close
to the device as possible and use short, wide
traces between the power components.
•
Use a ground plane to further reduce noise
interference on sensitive circuit nodes.
Figure 1 — Typical Application Schematic, Boost Topology
50%
55%
60%
65%
70%
75%
80%
85%
0
3
5
8
10
13
15
18
20
Iout(mA)
3S1P
4S1P
5S1P
6S1P
7S1P
8S1P
Input Voltage: 5V
10uH(A915AY-100M)
Efficiency Boost_Iout
5Vin, 10uH(A915AY-100M)
Iout: 20mA
Output cap: a)5Vi1uF, b)3.6Vin2uF
10uH(A915AY-100M)
Efficiency Boost_Vout
70%
72%
74%
76%
78%
80%
82%
8
10
12
14
16
18
20
22
24
26
Vout(V)
5Vin
3.6Vin
10uH(A915AY-100M)



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