The TPS6105x device uses a high-frequency synchronous-boost topology with constant current sink to drive single white LEDs. The device uses an inductive fixed-frequency PWM control scheme using small external components, minimizing input ripple current.
The 2-MHz switching frequency allows the use of small and low-profile 2.2-µH inductors. To optimize overall efficiency, the device operates with only a 250-mV LED feedback voltage.
The TPS6105x device not only operates as a regulated current source, but also as a standard voltage-boost regulator. This additional operating mode can be useful to supply other high-power devices in the system, such as a hands-free audio power amplifier, or any other component requiring a supply voltage higher than the battery voltage.
The LED current or the desired output voltage can be programmed through two logic signals (MODE0/1). To simplify flash synchronization with the camera module, the device offers a trigger pin (FLASH_SYNC) for fast LED turnon time.
When the TPS6105x is not in use, it can be put into shutdown mode, reducing the input current to 0.3 µA (typical). During shutdown, the LED pin is high impedance to avoid leakage current through the LED.
| Documentación principal | Tipo | Título | Opciones de formato | Descargar la versión más reciente en inglés | Fecha |
|---|---|---|---|---|---|
| * | Hoja de datos | High Power White LED Driver 2-MHz Synchronous Boost Converter datasheet (Rev. B) | PDF | HTML | 11/09/2015 | |
| Informe | Common LED Functions and LED Driver Design Considerations | 21/09/2020 | |||
| Nota sobre la aplicación | Performing Accurate PFM Mode Efficiency Measurements (Rev. A) | 11/12/2018 | |||
| Guía de selección | Power Management Guide 2018 (Rev. R) | 25/06/2018 | |||
| Nota sobre la aplicación | Optimizing Transient Response of Internally Compensated DC-DC Converters (Rev. B) | 29/11/2017 | |||
| Nota sobre la aplicación | Extending the Soft Start Time Without a Soft Start Pin (Rev. B) | 15/06/2017 |
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| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| VSON (DRC) | 10 | Ultra Librarian |
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