t6325a TM Technology Inc., t6325a Datasheet - Page 4

• Manufacturer Part Number: t6325a
• Description: Step-down, White Led Constant-current Supply
• Manufacturer: TM Technology Inc.

tm
uses a single resistor to set the current for LED. The T6325A offers several advantages over using
resistors, such as improved LED to LED brightness matching, lower variation with supply voltage
changes. The T6325A uses options single resistor or PWM to set the current for LED. Significantly
lower dropout voltage, and in some applications, significantly improved efficiency.
Enable Input
(< 1V) to disable the device. Driving EN low forces and SET into a high-impedance state.
Applications Information
architecture. Due to the high forward voltage of white LED. The T6325A current regulating
architecture and low dropout greatly minimize this effect compared to using simple resistors. The
enable function of the T6325A turns on and off the LED.
TYPICAL APPLICATION CIRCUITS
TM Technology Inc. reserves the right
to change products or specifications without notice.
Functional Description
EN powers the input of the T6325A. Drive EN high (> 2.0V) to enable the device; drive EN low
The T6325A provides step-down constant current supply for white LED designs. The T6325A
Very Low-Cost, High-Efficiency Solution . This is the least expensive and most efficient
Note: *RSET value is 0.33 ohm at I
CH
TE
V
IN
OFF ON
7V to 32V
47uF
Typical Application Circuit for Dimming from PWM or Resistor
C
1
VDD
PW M
CE
T6325A
LED
VSS
LX
LX
LED
=700mA
P. 4
D1
L1
22uF
50V
C
Preliminary T6325A
2
*RSET
Publication Date: OCT. 2007
LED
Revision: 0.B