TPS92511 Datasheet | Texas Instruments

Features - 1 Wide Input Voltage Range: 4.5 V to 65 V - Requires NO External Current Sensing Resistor - Requires NO External Loop pensation - Ease of Use, Needs Minimum 5 ponents - 1000:1 Contrast Ratio Feasible - Single Layer PCB Feasible - Can Work as High Voltage Buck Regulators - Can Work as Linear Current Shunt Regulators - Integrated Low-side N-channel MOSFET - LED Current Programmable up to 0.5 A - Typically ±3.6% LED Current Accuracy - Switching Frequency Programmable From 50 k Hz to 500 k Hz - Current Limit Protection - VCC Under-voltage Lock-out - Thermal Shutdown Protection - Support Analog Dimming and Thermal Foldback - Power Enhanced SOIC-8 Exposed Thermal Pad Package (HSOP-8) 2 Applications - High Power LED Driver - Architectural Lighting - Office Troffer - Automotive Lighting - MR-16 LED Lamp CVCC Simplified Application VCC PGND LED string ILED LX D1 L1 RIADJ IADJ GND DIM PWM dimming signal 3 Description The TPS92511 is an easy to use 65V constant current buck converter for driving a single LED string with current up to 0.5A and efficiency up to 95%. Only 5 external ponents are required for basic operation and single layer PCB layout is feasible because of the integration of a N-MOSFET, no external current sensing resistor, no external pensation and the proper terminal assignment. A high-value external resistor programs the LED current so that fine tuning of the LED current can be achieved. Another high-value external resistor programs a constant switching frequency from 50k Hz to 500k Hz. EMI design bees easier as a result of constant switching frequency. The TPS92511 provides a wide input voltage range from 4.5V to 65V. By adding simple external circuits, the device can handle applications with even higher input voltages. The TPS92511 employs a proprietary control scheme to regulate the LED current without the need of sensing the LED current directly. It applies a floating buck topology with a low-side N-channel power...