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LM3502ITL-16 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM3502ITL-16
Spiegazioni elettronici  Step-Up Converter for White LED Applications
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

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LM3502
Step-Up Converter for White LED Applications
General Description
The LM3502 is a white LED driver for lighting applications.
For dual display or large single white LED string backlighting
applications, the LM3502 provides a complete solution. The
LM3502 contains two internal whitle LED current bypass
FET(Field Effect Transitor) switches that are ideal for con-
troling dual display applications. The while LED current can
be adjusted with a PWM signal directly from a microcontrol-
ler without the need of an RC filter network.
With no external compensation, cycle-by-cycle current limit,
over-voltage protection, and under-voltage protection, the
LM3502 offers superior performance over other application
specific standard product step-up white LED drivers.
Features
n
Drive up to 4, 6, 8 or 10 white LEDs for Dual Display
Backlighting
n >
80% efficiency
n
Output Voltage Options: 16V , 25V , 35V, and 44V
n
Input Under-Voltage Protection
n
Internal Soft Start Eliminating Inrush Current
n
1 MHz Constant-Switching Frequency
n
Wide Input Voltage: 2.5V to 5.5V
n
Small External Components
n
Low Profile Packages: <1 mm Height
-10 Bump MicroSMD
-16 Pin LLP
Applications
n
Dual Display BackLighting in Portable Devices
n
Cellular Phones and PDAs
Typical Application
20131701
FIGURE 1. Blacklight Configuration with 10 White LEDs
September 2005
© 2005 National Semiconductor Corporation
DS201317
www.national.com


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