white light led driver with

Posted on Feb 5, 2014

Many consumer products using white light LEDs for illumination and backlighting provide gradual LED illumination at turnon and turnoff. This gradual illumination is usually achieved with the aid of a Microprocessor that provides PWM dimming control. This circuit uses the Texas Instruments TPS61040 white light LED Driver to provide gradual illumina

white light led driver with
Click here to download the full size of the above Circuit.

tion at turnon and turnoff without the use of a Microprocessor The following circuit generates a 101mA constant current to drive up to 6 white LEDs for portable applications such PDAs and digital cameras. The input operating range is 1. 8 V to 6 V, which covers two-cell alkaline and NiMh inputs (1. 8 V to ~3 V), three-cell alkaline and NiMh inputs (2. 7 V to ~4. 8 V), and single-cell Li-Ion inputs (3 V~4. 2 V). This boost converter uses R1 to set a constant current through the LEDs A detailed description of this circuit CAN be found in the TPS61040 data sheet ( SLVS413 ).

Leave Comment

characters left:

New Circuits



Popular Circuits

Slow Servo
ASCII Programmer PIC16F84
Slave Flash Trigger
Simple combination lock
BLY94 50W RF Amplifier Circuit
2N6766 FET Derating Curve
A Smart Barn Door Drive for Astrophotography
VHF radio receiver
AD7730 digital pressure measuring circuit