LM3501TL-16EV National Semiconductor, LM3501TL-16EV Datasheet
LM3501TL-16EV
Manufacturer Part Number
LM3501TL-16EV
Description
BOARD EVALUATION LM3501TL-16
Manufacturer
National Semiconductor
Series
PowerWise®r
Specifications of LM3501TL-16EV
Current - Output / Channel
20mA
Outputs And Type
1, Non-Isolated
Voltage - Output
16 V
Features
Dimmable
Voltage - Input
2.7 ~ 7V
Utilized Ic / Part
LM3501
Core Chip
LM3501
Topology
Buck
No. Of Outputs
1
Output Voltage
16V
Input Voltage
2.7V To 7V
Development Tool Type
Hardware - Eval/Demo Board
Mcu Supported Families
LM3501
Lead Free Status / RoHS Status
Not applicable / Not applicable
© 2004 National Semiconductor Corporation
LM3501 Evaluation Board
Introduction
The LM3501 is a synchronous step-up DC/DC converter
designed for white LED applications. The evaluation board is
set up to drive 3 standard V
battery. A fourth LED pad (D4) is included for testing of up to
4 low V
The LED current is set using the resistor R2 and the equa-
tion I
to the CNTRL pin. The maximum value of V
Schematic
Bill of Materials
LED
Designator
U1
L
C
C
D1–D3
D4
R1
F
IN
OUT
= V
white LEDs.
FB
/R2. V
FB
is determined by the voltage applied
F
white LEDs from a single Li-Ion
LM3501TL-ADJ, µSMD 8-lead
22 µH, DT1608C-223
1 µF, 25V Ceramic C3216X7R1E105K
1 µF, 25V Ceramic C3216X7R1E105K
White LED, LWT67C
0Ω Resistor, 1206 Case, CRCW1206–000J
24Ω, 1206 Case, CRCW1206–240J
AN200970
FB
is 0.515V and
Component
National Semiconductor
Application Note 1318
Clinton Jensen
February 2004
occurs with a CNTRL voltage of approximately 2.7V. This
condition translates into approximately 20mA LED current. A
lower CNTRL voltage translate into a lower V
a lower LED current. The feedback voltage can be calcu-
lated using the equation V
voltage of 125mV or greater turns the LEDs on while a
CNTRL voltage of 75mV or less turns the LEDs off. Please
note that for correct operation the SHDN pin must have a
voltage greater than 1.1V applied to it.
FB
National Semiconductor
Coilcraft
TDK
TDK
Osram
Vishay
Vishay
= 0.191*CNTRL. A CNTRL
20097001
Manufacturer
FB
www.national.com
voltage and
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LM3501TL-16EV Summary of contents
Page 1
... /R2 determined by the voltage applied LED the CNTRL pin. The maximum value of V Schematic Bill of Materials Designator U1 LM3501TL-ADJ, µSMD 8-lead L 22 µH, DT1608C-223 C 1 µF, 25V Ceramic C3216X7R1E105K µF, 25V Ceramic C3216X7R1E105K OUT D1–D3 White LED, LWT67C D4 0Ω Resistor, 1206 Case, CRCW1206–000J R1 24Ω ...
Page 2
... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...