Driving 10 Series LEDs with TPS61160/1
By Rust at 10 March, 2010, 5:18 am
TPS61160/1 with 40-V rated integrated switch FET is a boost converter that drives up to 10 LEDs in series. The boost converter is used to reduce output ripple, improve conversion efficiency, and allows for the use of small external components. The default white LED current is set with the external sensor resistor Rset, and the feedback voltage is regulated to 200mV. 1-wire digital interface through the CTRL pin can control the LED current during the operation. Another way, a pulse width modulation (PWM) signal can be applied to the CTRL pin through which the duty cycle determines the feedback reference voltage. The device features integrated open LED protection that disables the TPS1160/1 to prevent the output from exceeding the absolute maximum ratings during open LED condition is the maximum protection.
This device has some features such as:
- 2.7V to 18V Input Voltage Range
- 26V Open LED Protection for 6 LEDs (TPS61160)
- 38V Open LED Pretection for 10 LEDs (TPS61161)
- 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
And can be used in application such as:
Cellular Phones, Portable Media Players, Ultra Mobile Devices, GPS Receivers, White LED Backlighting for Media Form Factor Display. [Source: Texas Instruments Application Note]
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