LM3508TLEV National Semiconductor, LM3508TLEV Datasheet

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LM3508TLEV

Manufacturer Part Number
LM3508TLEV
Description
BOARD EVALUATION FOR LM3508TL
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheets
1.LM3508TLNOPB.pdf (14 pages)
2.LM3508TLEV.pdf (6 pages)

Specifications of LM3508TLEV

Current - Output / Channel
20mA
Outputs And Type
1, Non-Isolated
Voltage - Output
17V
Features
Dimmable
Voltage - Input
2.7 ~ 5.5V
Utilized Ic / Part
LM3508
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2007 National Semiconductor Corporation
LM3508 Evaluation Board
Introduction
The LM3508 is a synchronous step-up DC/DC converter de-
signed for white LED applications. The evaluation board is set
up to drive 4 standard V
supply. A fifth LED can be placed across the R1 pad for testing
Schematic
Bill of Materials
Designator
D1–D3
COUT
CIN
U1
R1
R1
L
F
white LEDs from a 2.7V to 5.5V input
LM3508TL, µSMD 9-bump
22 µH, ISAT = 330mA
1 µF, 10V Ceramic
1 µF, 25V Ceramic
C3216X7R1E105K
10Ω Resistor
Component
0Ω Resistor
White LED
300110
National Semiconductor
Application Note 1593
Travis Eichhorn
June 2007
up to 5 low VF LEDs. The LED current is set using the RSET
resistor via the equation I
board comes with RSET = 10Ω for approximately 20 mA LED
current. LED dimming is achieved by applying a PWM wave-
form of up to 100kHz to the DIM pin.
VLF3010AT-220MR33
CRCW060310R0F
C1608JB1A105M
C1608JB1E105M
Part Number
CRCW0603
LW M67C
LM3508
LED
= 0.2V/RSET. The evaluation
National Semiconductor
Manufacturer
Osram
Vishay
Vishay
TDK
TDK
TDK
www.national.com
30011001

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LM3508TLEV Summary of contents

Page 1

... C3216X7R1E105K D1–D3 White LED 0Ω Resistor R1 10Ω Resistor R1 © 2007 National Semiconductor Corporation National Semiconductor Application Note 1593 Travis Eichhorn June 2007 low VF LEDs. The LED current is set using the RSET resistor via the equation I board comes with RSET = 10Ω for approximately 20 mA LED current ...

Page 2

FIGURE 2. LM3508 Evaluation Board Layout Mid Layer 1 www.national.com FIGURE 1. LM3508 Evaluation Board Layout Topside 2 30011002 30011003 ...

Page 3

FIGURE 3. LM3508 Evaluation Board Layout Mid Layer 2 FIGURE 4. LM3508 Evaluation Board Layout Bottom Side 3 30011004 30011005 www.national.com ...

Page 4

Board Operation To operate the LM3508 evaluation board, connect a 2.7V to 5.5V supply between the VIN header and PGND. Jumper Connections • 3-position jumper (see bottom right jumper in figure 2). The middle pin connects to ...

Page 5

Notes 5 www.national.com ...

Page 6

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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