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TD8201 Datasheet(PDF) 9 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) 9 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
Function Description(Cont.) 
Dimming Control 
There are three different types of dimming control circuits: 
1. Using a DC Voltage 
For some applications, the preferred method of brightness
control is a variable DC voltage to adjust the LED current.
The dimming control using a DC voltage is shown in Figure
3. As the DC voltage increases, the voltage drop on R2
increases and the voltage drop on R1 decreases. Thus, the
LED current decreases. The selection of R2 and R3 will
make the current from the variable DC source much smaller
than the LED current and much larger than the FB pin bias
current.
2. Using a PWM Signal to EN Pin
With the PWM signal applied to the EN pin, the TD8201 is
turned on or off by the PWM signal. The LEDs operate at either
zero or full current. The average LED current increases
proportionally with the duty cycle of the PWM signal. A 0%
duty cycle corresponds to zero LED current. A 100% duty cycle
corresponds to full current. The frequency range of the PWM
signal should be up to 100KHz
 
 
 
3. Using a Filtered PWM Signal 
The filtered PWM signal can be considered as an adjustable
DC voltage. It can be used to replace the variable DC voltage
source in dimming control.
 
Board Layout Consideration 
As  with  all  switching  regulators,  careful  attention  must  be 
paid to the PCB board layout and component placement. To 
maximize  efficiency,  switch  rise  and  fall  times  are  made  as 
short  as  possible.  To  prevent  electromagnetic  interference 
(EMI)  problems,  proper  layout  of  the  high  frequency 
switching  path  is  essential.  The  voltage  signal  of  the  SW  pin 
has sharp rise and fall edges. Minimize the length and area of 
all traces connected to the SW pin and always use a ground 
plane  under  the  switching  regulator  to  minimize  interplane 
coupling. In addition, the ground connection for the feedback 
resistor  R1  should  be  tied  directly  to  the  GND  pin  and  not 
shared  with  any  other  component,  ensuring  a  clean, 
noise‐free connection. 
 


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