数据搜索系统,热门电子元器件搜索
  Chinese▼

Delete All
ON OFF
ALLDATASHEETCN.COM

X  

预览 PDF Download HTML

LM3500TL-16 Datasheet(数据表) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件型号  LM3500TL-16
说明  Synchronous Step-up DC/DC Converter for White LED
下载  18 Pages
Scroll/Zoom Zoom In 100% Zoom Out
制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 

LM3500TL-16 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
Zoom Inzoom in Zoom Outzoom out
 1 page
background image
LM3500
Synchronous Step-up DC/DC Converter for White LED
Applications
General Description
The LM3500 is a fixed-frequency step-up DC/DC converter
that is ideal for driving white LEDs for display backlighting
and other lighting functions. With fully intergrated synchro-
nous switching (no external schottky diode required) and a
low feedback voltage (500mV), power efficiency of the
LM3500 circuit has been optimized for lighting applications
in wireless phones and other portable products (single cell
Li-Ion or 3-cell NiMH battery supplies). The LM3500 oper-
ates with a fixed 1MHz switching frequency. When used with
ceramic input and output capacitors, the LM3500 provides a
small, low-noise, low-cost solution.
Two LM3500 options are available with different output volt-
age capabilities. The LM3500-21 has a maximum output
voltage of 21V and is typically suited for driving 4 or 5 white
LEDs in series. The LM3500-16 has a maximum output
voltage of 16V and is typically suited for driving 3 or 4 white
LEDs in series (maximum number of series LEDs dependent
on LED forward voltage). If the primary white LED network
should be disconnected, the LM3500 uses internal protec-
tion circuitry on the output to prevent a destructive over-
voltage event.
A single external resistor is used to set the maximum LED
current in LED-drive applications. The LED current can eas-
ily be adjusted using a pulse width modulated (PWM) signal
on the shutdown pin. In shutdown, the LM3500 completely
disconnects the input from output, creating total isolation and
preventing any leakage currents from trickling into the LEDs.
Features
n
Synchronous rectification, high efficiency and no
external schottky diode required
n
Uses small surface mount components
n
Can drive 2-5 white LEDs in series
(may function with more low-V
F LEDs)
n
2.7V to 7V input range
n
Internal output over-voltage protection (OVP) circuitry,
with no external zener diode required
LM3500-16: 15.5V OVP; LM3500-21: 20.5V OVP.
n
True shutdown isolation
n
Input undervoltage lockout
n
Requires only small ceramic capacitors at the input and
output
n
Thermal Shutdown
n
0.1µA shutdown current
n
Small 8-bump thin micro SMD package
Applications
n
LCD Bias Supplies
n
White LED Backlighting
n
Handheld Devices
n
Digital Cameras
n
Portable Applications
Typical Application Circuit
20065701
February 2005
© 2005 National Semiconductor Corporation
DS200657
www.national.com




HTML 页

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18 


数据表 下载




链接网址


Privacy Policy
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ]  

关于 Alldatasheet    |   广告服务   |   联系我们   |   隐私政策   |   书签   |   链接交换   |   制造商名单
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl