Low cost, small simple and low power multi-LED drive solutions are important in applications including LCD backlight, key illuminations and effects for handheld devices (e.g. cell phones), signage and indicators. The LED current is generally between 10mA to 30mA and is powered from a single cell Li-Ion or three cell alkaline/NiMH/NiCad batteries. For battery powered applications low shutdown quie…

This user’s guide contains background information for the TPS61196 as well as setup and operation instructions for the TPS61196EVM-600 evaluation module (EVM). Also included are test results, printed circuit board (PCB) layouts, schematics, and the bill of materials (BOM) for the EVM.

Demonstration Circuit 1827A features a 110V LED controller with spread spectrum frequency modulation – the LT®3795. Unlike most boosts, the circuit disconnects the output to protect against shorts or other fault conditions when the input voltage exceeds the output. The input voltage range for normal operation is from 8V to 60V. OVLO becomes active for inputs above 63V and the maximum input voltag…

Demonstration circuit 2020A is a 60VIN, 80VOUT LED driver. It generates its own PWMOUT waveform from its internal PWM generator for accurate PWM dimming with up to 33:1 brightness ratio. It accepts an input voltage from 5V to 60V and drives up to 67V of LEDs at 300mA (when PVIN is less than VLED). DC2020A features both PWM and analog dimming of the LED string. It has an OPENLED flag that indicate…

Demonstration circuit 805 is a low noise high current LED charge pump featuring the LTC®3216 and the LXCL-PWF1 Lumileds Luxeon Flash. The board is optimized for 800mA 300ms LED flash current or 200mA constant LED torch current with a single lithium ion battery input voltage range of 2.9V to 4.4V or three AAA batteries in series. The lithium ion battery input voltage range, high LED flash current …

Demonstration circuit 1055 is a 250mA Universal Nine Channel LED Driver with two RGB displays and three white LEDs featuring the LTC3219. The LTC3219 is a low noise charge pump designed to drive nine universal LED current sources. The LTC3219 requires only five small ceramic capacitors to form a complete LED power supply and current controller.

The MIC3223 is a constant-current boost switching controller specifically designed to power a string of high-power LEDs. The MIC3223 has an input voltage range from 4.5V to 20V and is ideal for a variety of applications. The MIC3223 evaluation board is designed to accommodate for a VIN of 6V to 20V.

Demonstration circuit 1497A is a 60V triple step-down LED driver featuring the LT3597. The demo board is optimized for 9 white LEDs, 100mA output per regulator from a 48V input. When different number or different color of LEDs is used for evaluation, attentions should be given to the maximum output voltage setting and fault reporting. The connections between the board and LEDs strings should be a…

Demonstration circuit 871 is a low noise high current LED charge pump featuring the LTC®3215 and a cell phone camera flash LED. The board has three versions (-A, -B, -C) that are optimized separately for a short LED flash current or a lower but constant LED torch current with a single lithium ion battery input voltage range of 2.9V to 4.4V or three AAA batteries in series. The lithium ion battery…

The AL5812 is an adjustable Linear LED driver offering excellent temperature stability and output handling capability. The AL5812 simplifies the design of linear and isolated or non-isolated LED drivers by setting the LED current with standard value resistors.