We can use boost converter such as TPS61160/1 with a 40V rated integrated switch FET to drive up to 10 LEDs in series. We can use it to reduce output ripple, improve conversion efficiency, and allows for the use of small external component. The external sensor resistor Rset is set on the default white LED current with feedback voltage is regulated to 200mV. The LED current can be controlled using the 1-wire digital interface through the CTRL pin during the operation or we can use a pulse width modulation (PWM) signal which is apply to the CTRL pin through which the duty cycle determines the feedback reference voltage. For maximum protection, the device features integrated open LED protection that turn the TPS61160/1 off during open LED conditions to prevent the output from exceeding the absolute maximum ratings.
The features of the device are detailed below:
- 200mV Reference Voltage With +- 2% Accuracy
- Flexible DIgital and PWM Brightness Control
- Built-in Soft Start
- Up to 90% Efficiency
- 2mmx2mmx0.8mm 6-pin QFN Packacge With Thermal Pad
- 2.7V to 18V Input Voltage Range
- 26V Open LED Protection for 6 LEDs (TPS61160)
- 38V Open LED Protection for 10 LEDs (TPS61161)
And applicable on device such as:
- Cellular Phones
- GPS Receivers
- White LED Backlighting for Media Factor Display
- Portable Media Players
- Ultra Mobile Device
[Source: Texas Instruments Application Note]
Possibly Related Circuits
- High-Brightness LED-Driver
This is a high-brightness LED-driver circuit. To provide a constant-voltage output we usually use DC/DC regulators. But constant-current output is the one that is needed in LED application. To provide a constant-current output, we can use this circuit. Here is the schematic diagram of high-brightness LED-driver circuit : This circuit... - Wide Input-Voltage Range High-Power LED Driver
This is a wide input-voltage range high-power LED driver circuit. This circuit based on a buck/boost converter controller regulates current to a white LED. This circuit can be used to replace incandescent bulbs, it efficiently match the LEDs to available power sources such as electrical systems car, batteries, etc. It... - Status Panel Driver for Industrial Machines
This is a status panel driver circuit. This circuit is used to turn on lamps or LEDs in a graphic panel that represent faults, action, and status of an industrial machine. This circuit has advantages compared with other graphic status panel. It is more economical than computer graphic display and... - Discrete High Current Switch Mode LED Driver
This is a discrete high current switch mode LED driver circuit. The basics of this circuit is a buck-converter principle. The efficiency of this circuit is 80 to 90 %. This circuit can be applied on automotive lighting applications. The advantages of this circuit are low component and low cost.... - LED Flasher Using Transistor
This simple LED flasher circuit will turn ON and OFF two LED alternatively. The first LED will turn ON when the second LED is OFF for some period, then the first led will turn OFF and the second LED will turn OFF. This cycle will be repeated as long as...
