Two-channel synchronous Buck with integrated switches
Configurable constant voltage (CV) or constant current (CC) operation
The TPS92542S device contains a synchronous BOOST controller and a two-channel monolithic synchronous buck LED driver with a wide 4.5V to 65V operating BUCK input voltage range.
The synchronous BOOST controller implements a peak current-mode controller to operate in constant voltage mode. The output voltage can be programmed using voltage reference on BSTREF pin. The BOOST controller incorporates frequency modulation technique for EMI reduction.
The monolithic synchronous BUCK implements an adaptive on-time average current mode control and is designed to generate either constant voltage (CV) or constant current (CC) output, based on preprogrammed register settings. The device default operation provides constant current output. For the device to operate in CV mode, the device must be programmed using UART serial interface. The BUCK is compatible with shunt FET dimming techniques and LED matrix manager-based dynamic beam headlamps. The adaptive on-time control enables high bandwidth operation with fast transient response. The control provides near constant default switching frequency of 400kHz, with an option to set the switching frequency in between 100kHz and 1.0MHz. Inductor current sensing and closed-loop feedback enable better than ±4% accuracy over wide input voltage, output voltage and ambient temperature range. The BUCK can independently modulate LED current using both analog or PWM dimming techniques.
The device provides an option to change the default buck and boost settings of the device using UART serial interface.
The TPS92542S-Q1 is available in a 7.0mm × 7.0mm thermally-enhanced 48-pin HTQFP package with top-exposed pad.
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTQFP (PHP) | 48 | Ultra Librarian |
| HTQFP (PKD) | 48 | Ultra Librarian |
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