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TD8201 Datasheet(PDF) 7 Page - TECHCODE SEMICONDUCTOR, INC.

Part # TD8201
Description  White LED Step-up Converter
Download  11 Pages
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Manufacturer  TECHCODE [TECHCODE SEMICONDUCTOR, INC.]
Direct Link  http://www.techcodesemi.com/
Logo TECHCODE - TECHCODE SEMICONDUCTOR, INC.

TD8201 Datasheet(HTML) 7 Page - TECHCODE SEMICONDUCTOR, INC.

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December,  20,  2011                             Techcode  Semiconductor  Limited                           www.techcodesemi.com 
Techcode®
White LED Step-up Converter
TD8201
DATASHEET
Typical Application Circuit 
  
OPERATION DESCRIPTION 
The  TD8201  uses  a  constant  frequency,  peak  current mode  boost  regulator  architecture  to  regulate  the  series string  of 
white  LEDs.  The  operation  of  the  TD8201can  be   understood   by   referring   to   the   simplified   block  diagram 
shown  above.  At  the  start  of  each  oscillator cycle, the control logic turns on the power switch M1. The   signal   at   the  
non‐inverting   input   of   the   PWM  comparator    is    proportional    to     the     switch     current,  summed 
together  with  a  portion  of  the  oscillator  ramp When  this  signal  reaches  the  level  set  by  the  output  of error amplifier, the 
PWM comparator resets the latch in the control  logic and  turns  off the power  switch.  In this manner,  error  amplifier  sets 
the  correct  peak  current level   to   keep   the   LED   current   in   regulation.   If   the feedback voltage starts to drop, 
the  output  of  the  error amplifier increases. This results in more current to flow through  M1,  hence  increasing  the  power 
delivered  to the output. 
 
 


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