The TPS54200 is a 1.5-A synchronous buck WLED driver up to 28-V input. Current mode operation provides fast transient response and eases loop stabilization.
●By integrating the MOSFETs and employing the SOT23-6 package, TPS54200 achieves the high-power density and offers a small footprint on the PCB.
●The TPS54200 implements analog dimming by changing internal reference voltage proportional to the duty cycle of PWM signal input in analog dimming mode. This device also support PWM dimming mode, in which the internal reference voltage will be halved to 100 mV for higher efficiency.
●Cycle-by-cycle current limit in high-side MOSFET protects the converter in an over-load condition and is enhanced by a low-side MOSFET freewheeling current limit which prevents current runaway. There is a low-side MOSFET sinking current limit to prevent excessive reverse current. For safety and protection the TPS54200 includes LED open and short protection, sense resistor open and short protection, and device thermal protection. To protect the LED from over-current damage, the driver shuts down and is latched once over current is detected.
● 4.5-V to 28-V Wide Input Range
● Integrated 150-mΩ and 70-mΩ MOSFETs for 1.5-A, Continuous Output Current
● Low, 2-μA Shutdown Current
● Fixed 600-kHz Frequency
● Peak Current Mode with Internal Compensation
● 200-mV and 100-mV Sense Voltage During Analog and PWM Dimming Mode
● Precision Analog Dimming by PWM Input
● LED Open and Short Protection
● Sense Resistor Open and Short Protection
● Thermal Shutdown
● SOT23-6 Package
