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TD8201 Datasheet(PDF) 8 Page - TECHCODE SEMICONDUCTOR, INC.

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

TD8201 Datasheet(HTML) 8 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
ILED(mA)
RFB Value(Ω)
5
20.8
10
10.4
15
6.93
20
5.1
Function Description 
Driving Capability
 
 
Inductor Selections
 
Capacitor Selection 
The  small  size  of  ceramic  capacitors  makes  them  ideal  for 
TD8201 applications. X5R and X7R types are recommended 
because  they  retain  their  capacitance  over  wider  voltage 
and  temperature  ranges  than  other  types  such  as  Y5V  or 
Z5U. A 1μF input capacitor and a 0.22  μF output capacitor 
are sufficient for most TD8201 applications.
Diodes Selection 
Schottky  diodes,  with  their  low  forward  voltage  drop  and 
fast  reverse  recovery,  are  the  ideal  choices  for  TD8201 
applications.  The  forward  voltage  drop  of  a  Schottky  diode 
represents  the  conduction  losses  in  the  diode,  while  the 
diode capacitance (Cor CD) represents the switching losses. 
For  diode  selection,  both  forward  voltage  drop  and  diode 
capacitance  need  to  be  considered.  Schottky  diodes  with 
higher  current  ratings  usually  have  lower  forward  voltage 
drop  and  larger  diode  capacitance,  which  can  cause 
significant switching losses at the 1.25MHz switching  
PARTNUMBER 
DCR(Ω)  CURRENT RATING(mA)MANUFACTURER 
LQH3C220
 
0.71
 
250
 
MURATA
 
CDRH3D16‐220
  0.53 
350
 
SUMIDA
 
LB2012B220M
  1.7 
75
 
TAIYO YUDEN
 
LEM2520‐220
  5.5 
125
 
TAIYO YUDEN
 
EJPC220KF
 
4.0
 
160
 
PANASONIC
 
frequency of the TD8201. A Schottky diode rated at 100mA to 
200mA  is  sufficient  for  most  TD8201  applications. Some 
recommended  Schottky  diodes  are  listed  in  the  following 
table: 
 
 
 
 
 
 
 
LED Current Control 
The  LED  current  is  controlled  by  the  feedback  resistor.  The 
feedback reference is 104mV. The LED current is 104mV/Rfb. 
In order to have accurate LED current, precision resistors are 
preferred  (1%  is  recommended).  The  formula  and  table  for 
RFB selection are shown below 
 
 
 
 
 
 
 
 
Open Circuit Protection 
Open circuit protection will shut off the TD8201 if the output 
voltage goes too high when the OV pin is tied to the output. 
In  some  cases  an  LED  may  fail,  which  will  result  in  the 
feedback  voltage  always  being  zero.  The  TD8201  will  then 
switch at its maximum duty cycle boosting the output voltage 
higher and higher. By connecting the OV pin to the top of the 
LED string the TD8201 checks this condition and if the output 
ever  exceeds  20V,  the  TD8201  will  shut  down.  The  part  will 
not switch again until the power is recycled. 
PART 
NUMBER 
FORWARD 
CURRENT
(mA)
VOLTAGE DROP 
(V) 
DIODE 
CAPACITAN
CE 
 
MANUFACTURER
CMDSH‐3 
100 
0.58@100mA  7.0@10V 
Central 
CMDSH2‐3
200 
0.49@200mA  15@10v 
Central 
BAT54 
200 
0.53@100mA  10@25v 
Zetex 


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